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[r]" accesskey="r"><span>Toletzt ännert</span></a></li> </ul> </div> </div> <div id="p-" class="vector-menu mw-portlet mw-portlet-" > <div class="vector-menu-heading"> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-Kuntakt" class="mw-list-item"><a href="/wiki/Wikipedia:Kuntakt"><span>Kuntakt</span></a></li><li id="n-Impressum" class="mw-list-item"><a href="/wiki/Wikipedia:Impressum"><span>Impressum</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Wikipedia:H%C3%B6%C3%B6ftsiet" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="Dat fre’e Nakieksel" src="/static/images/mobile/copyright/wikipedia-tagline-nds.svg" width="99" height="10" style="width: 6.1875em; height: 0.625em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Spezial:S%C3%B6%C3%B6k" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Söken in dit Wiki [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Söken</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Söken Wikipedia" aria-label="Söken Wikipedia" autocapitalize="sentences" title="Söken in dit Wiki [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Spezial:Söök"> </div> <button class="cdx-button cdx-search-input__end-button">Söken</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Persönliche Warktüüch"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Erscheinungsbild"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Änderung des Aussehens der Schriftgröße, -breite und -farbe der Seite" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Erscheinungsbild" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Erscheinungsbild</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_nds.wikipedia.org&uselang=nds" class=""><span>Spennen</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Spezial:Brukerkonto_anleggen&returnto=Halfweertstiet" title="Wir ermutigen dich dazu, ein Benutzerkonto zu erstellen und dich anzumelden. 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Es ist jedoch nicht zwingend erforderlich."><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Brukerkonto inrichten</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Spezial:Anmellen&returnto=Halfweertstiet" title="Du kannst di geern anmellen, dat is aver nich nödig, dat du Sieden ännern kannst. 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<div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Website"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Inhaltsverzeichnis" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Inhaltsverzeichnis</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">In die Seitenleiste verschieben</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">versteken</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Anfang</div> </a> </li> <li id="toc-To’n_Verkloren" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#To’n_Verkloren"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>To’n Verkloren</span> </div> </a> <ul id="toc-To’n_Verkloren-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Verfallsgesett" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Verfallsgesett"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Verfallsgesett</span> </div> </a> <button aria-controls="toc-Verfallsgesett-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Unterabschnitt Verfallsgesett umschalten</span> </button> <ul id="toc-Verfallsgesett-sublist" class="vector-toc-list"> <li id="toc-Statistik_vun’n_radioaktiven_Verfall" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Statistik_vun’n_radioaktiven_Verfall"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Statistik vun’n radioaktiven Verfall</span> </div> </a> <ul id="toc-Statistik_vun’n_radioaktiven_Verfall-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Mathemaatsche_Definitschoon_vun_de_Halfweertstiet" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Mathemaatsche_Definitschoon_vun_de_Halfweertstiet"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Mathemaatsche Definitschoon vun de Halfweertstiet</span> </div> </a> <ul id="toc-Mathemaatsche_Definitschoon_vun_de_Halfweertstiet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bispelen" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bispelen"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Bispelen</span> </div> </a> <button aria-controls="toc-Bispelen-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Unterabschnitt Bispelen umschalten</span> </button> <ul id="toc-Bispelen-sublist" class="vector-toc-list"> <li id="toc-Radioaktive_Halfweertstiet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Radioaktive_Halfweertstiet"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Radioaktive Halfweertstiet</span> </div> </a> <ul id="toc-Radioaktive_Halfweertstiet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Radiokarbonmethood" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Radiokarbonmethood"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Radiokarbonmethood</span> </div> </a> <ul id="toc-Radiokarbonmethood-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bioloogsch_Halfweertstiet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Bioloogsch_Halfweertstiet"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>Bioloogsch Halfweertstiet</span> </div> </a> <ul id="toc-Bioloogsch_Halfweertstiet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Effektiv_Halfweertstiet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Effektiv_Halfweertstiet"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.4</span> <span>Effektiv Halfweertstiet</span> </div> </a> <ul id="toc-Effektiv_Halfweertstiet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bibliometrisch_Halfweertstiet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Bibliometrisch_Halfweertstiet"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.5</span> <span>Bibliometrisch Halfweertstiet</span> </div> </a> <ul id="toc-Bibliometrisch_Halfweertstiet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Halfweertstiet_bi_Autopriesen" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Halfweertstiet_bi_Autopriesen"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.6</span> <span>Halfweertstiet bi Autopriesen</span> </div> </a> <ul id="toc-Halfweertstiet_bi_Autopriesen-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Borns" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Borns"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Borns</span> </div> </a> <ul id="toc-Borns-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Inhaltsverzeichnis" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Inhaltsverzeichnis umschalten" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Inhaltsverzeichnis umschalten</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Halfweertstiet</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Zu einem Artikel in einer anderen Sprache gehen. Verfügbar in 82 Sprachen" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-82" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">82 Spraaken</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Halfleeftyd" title="Halfleeftyd – Afrikaansch" lang="af" hreflang="af" data-title="Halfleeftyd" data-language-autonym="Afrikaans" data-language-local-name="Afrikaansch" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Periodo_de_semidesintegraci%C3%B3n" title="Periodo de semidesintegración – Aragoneesch" lang="an" hreflang="an" data-title="Periodo de semidesintegración" data-language-autonym="Aragonés" data-language-local-name="Aragoneesch" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B9%D9%85%D8%B1_%D8%A7%D9%84%D9%86%D8%B5%D9%81" title="عمر النصف – Araabsch" lang="ar" hreflang="ar" data-title="عمر النصف" data-language-autonym="العربية" data-language-local-name="Araabsch" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D9%86%D8%B5_%D8%AF_%D9%84%D8%AD%D9%8A%D8%A7%D8%A9" title="نص د لحياة – Marokkanisches Arabisch" lang="ary" hreflang="ary" data-title="نص د لحياة" data-language-autonym="الدارجة" data-language-local-name="Marokkanisches Arabisch" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Periodu_de_semidesintegraci%C3%B3n" title="Periodu de semidesintegración – Asturiaansch" lang="ast" hreflang="ast" data-title="Periodu de semidesintegración" data-language-autonym="Asturianu" data-language-local-name="Asturiaansch" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Yar%C4%B1mpar%C3%A7alanma_periodu" title="Yarımparçalanma periodu – Aserbaidschaansch" lang="az" hreflang="az" data-title="Yarımparçalanma periodu" data-language-autonym="Azərbaycanca" data-language-local-name="Aserbaidschaansch" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D1%8B%D1%8F%D0%B4_%D0%BF%D0%B0%D1%9E%D1%80%D0%B0%D1%81%D0%BF%D0%B0%D0%B4%D1%83" title="Перыяд паўраспаду – Wittruss’sch" lang="be" hreflang="be" data-title="Перыяд паўраспаду" data-language-autonym="Беларуская" data-language-local-name="Wittruss’sch" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D0%B8%D0%BE%D0%B4_%D0%BD%D0%B0_%D0%BF%D0%BE%D0%BB%D1%83%D1%80%D0%B0%D0%B7%D0%BF%D0%B0%D0%B4" title="Период на полуразпад – Bulgaarsch" lang="bg" hreflang="bg" data-title="Период на полуразпад" data-language-autonym="Български" data-language-local-name="Bulgaarsch" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bh mw-list-item"><a href="https://bh.wikipedia.org/wiki/%E0%A4%B9%E0%A4%BE%E0%A4%AB-%E0%A4%B2%E0%A4%BE%E0%A4%87%E0%A4%AB" title="हाफ-लाइफ – Bihaarsch" lang="bh" hreflang="bh" data-title="हाफ-लाइफ" data-language-autonym="भोजपुरी" data-language-local-name="Bihaarsch" class="interlanguage-link-target"><span>भोजपुरी</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%85%E0%A6%B0%E0%A7%8D%E0%A6%A7%E0%A6%BE%E0%A6%AF%E0%A6%BC%E0%A7%81" title="অর্ধায়ু – Bengaalsch" lang="bn" hreflang="bn" data-title="অর্ধায়ু" data-language-autonym="বাংলা" data-language-local-name="Bengaalsch" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Vrijeme_poluraspada" title="Vrijeme poluraspada – Bosnisch" lang="bs" hreflang="bs" data-title="Vrijeme poluraspada" data-language-autonym="Bosanski" data-language-local-name="Bosnisch" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Per%C3%ADode_de_semidesintegraci%C3%B3" title="Període de semidesintegració – Katalaansch" lang="ca" hreflang="ca" data-title="Període de semidesintegració" data-language-autonym="Català" data-language-local-name="Katalaansch" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D9%86%DB%8C%D9%88%DB%95%D8%AA%DB%95%D9%85%DB%95%D9%86" title="نیوەتەمەن – Zentraalkurdsch" lang="ckb" hreflang="ckb" data-title="نیوەتەمەن" data-language-autonym="کوردی" data-language-local-name="Zentraalkurdsch" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Polo%C4%8Das_p%C5%99em%C4%9Bny" title="Poločas přeměny – Tschech’sch" lang="cs" hreflang="cs" data-title="Poločas přeměny" data-language-autonym="Čeština" data-language-local-name="Tschech’sch" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%C3%87%D1%83%D1%80%D0%BC%D0%B0_%D0%B0%D1%80%D0%BA%D0%B0%D0%BD%D1%83_%D1%82%D0%B0%D0%BF%D1%85%C4%83%D1%80%C4%95" title="Çурма аркану тапхăрĕ – Tschuwasch’sch" lang="cv" hreflang="cv" data-title="Çурма аркану тапхăрĕ" data-language-autonym="Чӑвашла" data-language-local-name="Tschuwasch’sch" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Hanner_oes" title="Hanner oes – Waliesch" lang="cy" hreflang="cy" data-title="Hanner oes" data-language-autonym="Cymraeg" data-language-local-name="Waliesch" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Halveringstid" title="Halveringstid – Däänsch" lang="da" hreflang="da" data-title="Halveringstid" data-language-autonym="Dansk" data-language-local-name="Däänsch" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Halbwertszeit" title="Halbwertszeit – Düütsch" lang="de" hreflang="de" data-title="Halbwertszeit" data-language-autonym="Deutsch" data-language-local-name="Düütsch" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%A7%CF%81%CF%8C%CE%BD%CE%BF%CF%82_%CE%B7%CE%BC%CE%B9%CE%B6%CF%89%CE%AE%CF%82" title="Χρόνος ημιζωής – Greeksch" lang="el" hreflang="el" data-title="Χρόνος ημιζωής" data-language-autonym="Ελληνικά" data-language-local-name="Greeksch" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Half-life" title="Half-life – Engelsch" lang="en" hreflang="en" data-title="Half-life" data-language-autonym="English" data-language-local-name="Engelsch" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Duoni%C4%9Da_tempo" title="Duoniĝa tempo – Esperanto" lang="eo" hreflang="eo" data-title="Duoniĝa tempo" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Semivida" title="Semivida – Spaansch" lang="es" hreflang="es" data-title="Semivida" data-language-autonym="Español" data-language-local-name="Spaansch" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Poolestusaeg" title="Poolestusaeg – Eestnisch" lang="et" hreflang="et" data-title="Poolestusaeg" data-language-autonym="Eesti" data-language-local-name="Eestnisch" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Semidesintegrazio-periodo" title="Semidesintegrazio-periodo – Basksch" lang="eu" hreflang="eu" data-title="Semidesintegrazio-periodo" data-language-autonym="Euskara" data-language-local-name="Basksch" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%86%DB%8C%D9%85%D9%87%E2%80%8C%D8%B9%D9%85%D8%B1" title="نیمه‌عمر – Pers’sch" lang="fa" hreflang="fa" data-title="نیمه‌عمر" data-language-autonym="فارسی" data-language-local-name="Pers’sch" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Puoliintumisaika" title="Puoliintumisaika – Finnsch" lang="fi" hreflang="fi" data-title="Puoliintumisaika" data-language-autonym="Suomi" data-language-local-name="Finnsch" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Demi-vie" title="Demi-vie – Franzöösch" lang="fr" hreflang="fr" data-title="Demi-vie" data-language-autonym="Français" data-language-local-name="Franzöösch" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Hualeww%C3%A4%C3%A4rstidj" title="Hualewwäärstidj – Noordfreesch" lang="frr" hreflang="frr" data-title="Hualewwäärstidj" data-language-autonym="Nordfriisk" data-language-local-name="Noordfreesch" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Leathr%C3%A9" title="Leathré – Iersch" lang="ga" hreflang="ga" data-title="Leathré" data-language-autonym="Gaeilge" data-language-local-name="Iersch" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gan mw-list-item"><a href="https://gan.wikipedia.org/wiki/%E5%8D%8A%E8%A1%B0%E6%9C%9F" title="半衰期 – Gan" lang="gan" hreflang="gan" data-title="半衰期" data-language-autonym="贛語" data-language-local-name="Gan" class="interlanguage-link-target"><span>贛語</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Per%C3%ADodo_de_semidesintegraci%C3%B3n" title="Período de semidesintegración – Galizisch" lang="gl" hreflang="gl" data-title="Período de semidesintegración" data-language-autonym="Galego" data-language-local-name="Galizisch" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9E%D7%97%D7%A6%D7%99%D7%AA_%D7%97%D7%99%D7%99%D7%9D" title="מחצית חיים – Hebrääsch" lang="he" hreflang="he" data-title="מחצית חיים" data-language-autonym="עברית" data-language-local-name="Hebrääsch" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%85%E0%A4%B0%E0%A5%8D%E0%A4%A7%E0%A4%BE%E0%A4%AF%E0%A5%81_%E0%A4%95%E0%A4%BE%E0%A4%B2" title="अर्धायु काल – Hindi" lang="hi" hreflang="hi" data-title="अर्धायु काल" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Vrijeme_poluraspada" title="Vrijeme poluraspada – Kroaatsch" lang="hr" hreflang="hr" data-title="Vrijeme poluraspada" data-language-autonym="Hrvatski" data-language-local-name="Kroaatsch" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Demi-vi" title="Demi-vi – Haitiaansch-Kreoolsch" lang="ht" hreflang="ht" data-title="Demi-vi" data-language-autonym="Kreyòl ayisyen" data-language-local-name="Haitiaansch-Kreoolsch" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Felez%C3%A9si_id%C5%91" title="Felezési idő – Ungaarsch" lang="hu" hreflang="hu" data-title="Felezési idő" data-language-autonym="Magyar" data-language-local-name="Ungaarsch" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Waktu_paruh" title="Waktu paruh – Indoneesch" lang="id" hreflang="id" data-title="Waktu paruh" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indoneesch" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Helmingunart%C3%ADmi" title="Helmingunartími – Ieslandsch" lang="is" hreflang="is" data-title="Helmingunartími" data-language-autonym="Íslenska" data-language-local-name="Ieslandsch" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Emivita_(fisica)" title="Emivita (fisica) – Italieensch" lang="it" hreflang="it" data-title="Emivita (fisica)" data-language-autonym="Italiano" data-language-local-name="Italieensch" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%8D%8A%E6%B8%9B%E6%9C%9F" title="半減期 – Japaansch" lang="ja" hreflang="ja" data-title="半減期" data-language-autonym="日本語" data-language-local-name="Japaansch" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%9C%E1%83%90%E1%83%AE%E1%83%94%E1%83%95%E1%83%A0%E1%83%90%E1%83%93_%E1%83%93%E1%83%90%E1%83%A8%E1%83%9A%E1%83%98%E1%83%A1_%E1%83%9E%E1%83%94%E1%83%A0%E1%83%98%E1%83%9D%E1%83%93%E1%83%98" title="ნახევრად დაშლის პერიოდი – Georgsch" lang="ka" hreflang="ka" data-title="ნახევრად დაშლის პერიოდი" data-language-autonym="ქართული" data-language-local-name="Georgsch" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%96%D0%B0%D1%80%D1%82%D1%8B%D0%BB%D0%B0%D0%B9_%D1%8B%D0%B4%D1%8B%D1%80%D0%B0%D1%83_%D0%BC%D0%B5%D1%80%D0%B7%D1%96%D0%BC%D1%96" title="Жартылай ыдырау мерзімі – Kasach’sch" lang="kk" hreflang="kk" data-title="Жартылай ыдырау мерзімі" data-language-autonym="Қазақша" data-language-local-name="Kasach’sch" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%85%E0%B2%B0%E0%B3%8D%E0%B2%A7%E0%B2%BE%E0%B2%AF%E0%B3%81%E0%B2%B7%E0%B3%8D%E0%B2%AF" title="ಅರ್ಧಾಯುಷ್ಯ – Kannada" lang="kn" hreflang="kn" data-title="ಅರ್ಧಾಯುಷ್ಯ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="Kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B0%98%EA%B0%90%EA%B8%B0" title="반감기 – Koreaansch" lang="ko" hreflang="ko" data-title="반감기" data-language-autonym="한국어" data-language-local-name="Koreaansch" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Halveringstied" title="Halveringstied – Limborgsch" lang="li" hreflang="li" data-title="Halveringstied" data-language-autonym="Limburgs" data-language-local-name="Limborgsch" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Pus%C4%97jimo_trukm%C4%97" title="Pusėjimo trukmė – Litausch" lang="lt" hreflang="lt" data-title="Pusėjimo trukmė" data-language-autonym="Lietuvių" data-language-local-name="Litausch" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Pussabruk%C5%A1anas_periods" title="Pussabrukšanas periods – Lettsch" lang="lv" hreflang="lv" data-title="Pussabrukšanas periods" data-language-autonym="Latviešu" data-language-local-name="Lettsch" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D0%B8%D0%BE%D0%B4_%D0%BD%D0%B0_%D0%BF%D0%BE%D0%BB%D1%83%D1%80%D0%B0%D1%81%D0%BF%D0%B0%D0%B4" title="Период на полураспад – Mazedoonsch" lang="mk" hreflang="mk" data-title="Период на полураспад" data-language-autonym="Македонски" data-language-local-name="Mazedoonsch" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%85%E0%B5%BC%E0%B4%A6%E0%B5%8D%E0%B4%A7%E0%B4%BE%E0%B4%AF%E0%B5%81%E0%B4%B8%E0%B5%8D%E0%B4%B8%E0%B5%8D" title="അർദ്ധായുസ്സ് – Malayalam" lang="ml" hreflang="ml" data-title="അർദ്ധായുസ്സ്" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A5%D0%B0%D0%B3%D0%B0%D1%81_%D0%B7%D0%B0%D0%B4%D1%80%D0%B0%D0%BB" title="Хагас задрал – Mongoolsch" lang="mn" hreflang="mn" data-title="Хагас задрал" data-language-autonym="Монгол" data-language-local-name="Mongoolsch" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Separuh_hayat" title="Separuh hayat – Malaisch" lang="ms" hreflang="ms" data-title="Separuh hayat" data-language-autonym="Bahasa Melayu" data-language-local-name="Malaisch" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%9E%E1%80%80%E1%80%BA%E1%80%90%E1%80%99%E1%80%BA%E1%80%B8%E1%80%9D%E1%80%80%E1%80%BA" title="သက်တမ်းဝက် – Birmaansch" lang="my" hreflang="my" data-title="သက်တမ်းဝက်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Birmaansch" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Halveringstijd" title="Halveringstijd – Nedderlandsch" lang="nl" hreflang="nl" data-title="Halveringstijd" data-language-autonym="Nederlands" data-language-local-name="Nedderlandsch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Halveringstid" title="Halveringstid – Norweegsch Nynorsk" lang="nn" hreflang="nn" data-title="Halveringstid" data-language-autonym="Norsk nynorsk" data-language-local-name="Norweegsch Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Halveringstid" title="Halveringstid – Norweegsch Bokmål" lang="nb" hreflang="nb" data-title="Halveringstid" data-language-autonym="Norsk bokmål" data-language-local-name="Norweegsch Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Mi%C3%A8ja_vida" title="Mièja vida – Okzitaansch" lang="oc" hreflang="oc" data-title="Mièja vida" data-language-autonym="Occitan" data-language-local-name="Okzitaansch" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Czas_po%C5%82owicznego_rozpadu" title="Czas połowicznego rozpadu – Poolsch" lang="pl" hreflang="pl" data-title="Czas połowicznego rozpadu" data-language-autonym="Polski" data-language-local-name="Poolsch" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%A7%D8%AF%DA%BE_%D8%AC%DB%8C%D9%88%D9%86" title="ادھ جیون – Westliches Panjabi" lang="pnb" hreflang="pnb" data-title="ادھ جیون" data-language-autonym="پنجابی" data-language-local-name="Westliches Panjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Meia-vida" title="Meia-vida – Portugeesch" lang="pt" hreflang="pt" data-title="Meia-vida" data-language-autonym="Português" data-language-local-name="Portugeesch" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Kuskan_ismuykuy_mit%27a" title="Kuskan ismuykuy mit'a – Quechua" lang="qu" hreflang="qu" data-title="Kuskan ismuykuy mit'a" data-language-autonym="Runa Simi" data-language-local-name="Quechua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Perioad%C4%83_de_%C3%AEnjum%C4%83t%C4%83%C8%9Bire" title="Perioadă de înjumătățire – Rumäänsch" lang="ro" hreflang="ro" data-title="Perioadă de înjumătățire" data-language-autonym="Română" data-language-local-name="Rumäänsch" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D0%B8%D0%BE%D0%B4_%D0%BF%D0%BE%D0%BB%D1%83%D1%80%D0%B0%D1%81%D0%BF%D0%B0%D0%B4%D0%B0" title="Период полураспада – Russ’sch" lang="ru" hreflang="ru" data-title="Период полураспада" data-language-autonym="Русский" data-language-local-name="Russ’sch" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Vreme_poluraspada" title="Vreme poluraspada – Serbokroatisch" lang="sh" hreflang="sh" data-title="Vreme poluraspada" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbokroatisch" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Half-life_(element)" title="Half-life (element) – einfaches Englisch" lang="en-simple" hreflang="en-simple" data-title="Half-life (element)" data-language-autonym="Simple English" data-language-local-name="einfaches Englisch" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Pol%C4%8Das_premeny" title="Polčas premeny – Slowaaksch" lang="sk" hreflang="sk" data-title="Polčas premeny" data-language-autonym="Slovenčina" data-language-local-name="Slowaaksch" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Razpolovni_%C4%8Das" title="Razpolovni čas – Sloweensch" lang="sl" hreflang="sl" data-title="Razpolovni čas" data-language-autonym="Slovenščina" data-language-local-name="Sloweensch" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%92%D1%80%D0%B5%D0%BC%D0%B5_%D0%BF%D0%BE%D0%BB%D1%83%D1%80%D0%B0%D1%81%D0%BF%D0%B0%D0%B4%D0%B0" title="Време полураспада – Serbsch" lang="sr" hreflang="sr" data-title="Време полураспада" data-language-autonym="Српски / srpski" data-language-local-name="Serbsch" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Halveringstid" title="Halveringstid – Sweedsch" lang="sv" hreflang="sv" data-title="Halveringstid" data-language-autonym="Svenska" data-language-local-name="Sweedsch" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Nusumaisha" title="Nusumaisha – Suaheli" lang="sw" hreflang="sw" data-title="Nusumaisha" data-language-autonym="Kiswahili" data-language-local-name="Suaheli" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%85%E0%AE%B0%E0%AF%88%E0%AE%B5%E0%AE%BE%E0%AE%B4%E0%AF%8D%E0%AE%B5%E0%AF%81%E0%AE%95%E0%AF%8D_%E0%AE%95%E0%AE%BE%E0%AE%B2%E0%AE%AE%E0%AF%8D" title="அரைவாழ்வுக் காலம் – Tamilsch" lang="ta" hreflang="ta" data-title="அரைவாழ்வுக் காலம்" data-language-autonym="தமிழ்" data-language-local-name="Tamilsch" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%85%E0%B0%B0%E0%B1%8D%E0%B0%A7_%E0%B0%9C%E0%B1%80%E0%B0%B5%E0%B0%BF%E0%B0%A4_%E0%B0%95%E0%B0%BE%E0%B0%B2%E0%B0%82" title="అర్ధ జీవిత కాలం – Telugu" lang="te" hreflang="te" data-title="అర్ధ జీవిత కాలం" data-language-autonym="తెలుగు" data-language-local-name="Telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%84%E0%B8%A3%E0%B8%B6%E0%B9%88%E0%B8%87%E0%B8%8A%E0%B8%B5%E0%B8%A7%E0%B8%B4%E0%B8%95" title="ครึ่งชีวิต – Thai" lang="th" hreflang="th" data-title="ครึ่งชีวิต" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Yar%C4%B1_%C3%B6m%C3%BCr" title="Yarı ömür – Törksch" lang="tr" hreflang="tr" data-title="Yarı ömür" data-language-autonym="Türkçe" data-language-local-name="Törksch" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%AF%D1%80%D1%8B%D0%BC%D1%82%D0%B0%D1%80%D0%BA%D0%B0%D0%BB%D1%83_%D0%BF%D0%B5%D1%80%D0%B8%D0%BE%D0%B4%D1%8B" title="Ярымтаркалу периоды – Tataarsch" lang="tt" hreflang="tt" data-title="Ярымтаркалу периоды" data-language-autonym="Татарча / tatarça" data-language-local-name="Tataarsch" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D0%B5%D1%80%D1%96%D0%BE%D0%B4_%D0%BD%D0%B0%D0%BF%D1%96%D0%B2%D1%80%D0%BE%D0%B7%D0%BF%D0%B0%D0%B4%D1%83" title="Період напіврозпаду – Ukrainsch" lang="uk" hreflang="uk" data-title="Період напіврозпаду" data-language-autonym="Українська" data-language-local-name="Ukrainsch" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D9%86%D8%B5%D9%81_%D8%AD%DB%8C%D8%A7%D8%AA" title="نصف حیات – Urdu" lang="ur" hreflang="ur" data-title="نصف حیات" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz badge-Q70893996 mw-list-item" title=""><a href="https://uz.wikipedia.org/wiki/Yarim_yemirilish_davri" title="Yarim yemirilish davri – Usbeeksch" lang="uz" hreflang="uz" data-title="Yarim yemirilish davri" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Usbeeksch" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Chu_k%E1%BB%B3_b%C3%A1n_r%C3%A3" title="Chu kỳ bán rã – Vietnameesch" lang="vi" hreflang="vi" data-title="Chu kỳ bán rã" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnameesch" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E5%8D%8A%E8%A1%B0%E6%9C%9F" title="半衰期 – Wu" lang="wuu" hreflang="wuu" data-title="半衰期" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%8D%8A%E8%A1%B0%E6%9C%9F" title="半衰期 – Chineesch" lang="zh" hreflang="zh" data-title="半衰期" data-language-autonym="中文" data-language-local-name="Chineesch" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Po%C3%A0n-ki%C3%A1m-k%C3%AE" title="Poàn-kiám-kî – Min Nan" lang="nan" hreflang="nan" data-title="Poàn-kiám-kî" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Min Nan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%8D%8A%E8%A1%B0%E6%9C%9F" title="半衰期 – Kantonesisch" lang="yue" hreflang="yue" data-title="半衰期" data-language-autonym="粵語" data-language-local-name="Kantonesisch" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q47270#sitelinks-wikipedia" title="Interspraaklenken ännern" class="wbc-editpage">Linken ännern</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Naamrüüm"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Halfweertstiet" title="Siet ankieken [c]" accesskey="c"><span>Siet</span></a></li><li id="ca-talk" class="new vector-tab-noicon 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class="mw-content-ltr mw-parser-output" lang="nds" dir="ltr"><p>De <b>Halfweertstiet</b> (as Formelteken <b>t<sub>½</sub></b>) is de Tietduer, de en <a href="/w/index.php?title=Exponentiell_V%C3%B6rgang&action=edit&redlink=1" class="new" title="Exponentiell Vörgang (Siet noch nich vörhannen)">exponentiellen Vörgang</a> bruukt, bit en mit de Tiet afnehmen Weert op de Hälft rünner gahn is. Bi en Vörgang mit exponentiell Wassdom warrt vun de <b>Verdubbeltiet</b> snackt. </p><p>En exponentiell Vörgang liggt vör, wenn de Ännern mit de Tiet <a href="/w/index.php?title=Proportschonalit%C3%A4t&action=edit&redlink=1" class="new" title="Proportschonalität (Siet noch nich vörhannen)">proportschonal</a> is to de Mengde sülvst. Bekannte Vörgäng vun disse Oort sünd t. B. de Mengdenafnahm bi <a href="/wiki/Radioaktivit%C3%A4t" title="Radioaktivität">radioaktiv</a> <a href="/wiki/Nuklid" title="Nuklid">Nukliden</a> oder de Mengdentonahm bi bioloogsch Wassdomsvörgäng. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="To’n_Verkloren"><span id="To.E2.80.99n_Verkloren"></span>To’n Verkloren</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=1" title="Ännere Afsnitt: To’n Verkloren" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=1" title="Quellcode des Abschnitts bearbeiten: To’n Verkloren"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>En Mengde, vun de na de Halfweertstiet blots noch de Hälft överbleven is, halbeert sik in de nächsten Halfweertstiet nochmol wedder. Dormit blifft denn blots noch <sup>1</sup>/<sub>2</sub> · <sup>1</sup>/<sub>2</sub> = <sup>1</sup>/<sub>4</sub> vun de Anfangsmengde na. Vergeiht noch en wietere Halfweertstiet is blots noch <sup>1</sup>/<sub>8</sub> över, denn <sup>1</sup>/<sub>16</sub>, <sup>1</sup>/<sub>32</sub>, <sup>1</sup>/<sub>64</sub> un so wieter. Man, dat gellt blots as <a href="/w/index.php?title=V%C3%B6rgang_(Statistik)&action=edit&redlink=1" class="new" title="Vörgang (Statistik) (Siet noch nich vörhannen)">statistischen</a> <a href="/w/index.php?title=Middelweert&action=edit&redlink=1" class="new" title="Middelweert (Siet noch nich vörhannen)">Middelweert</a>, also wenn to’n Bispeel de radioaktive Proov, de bekeken warrt, ut en grote Tall vun Atomen besteiht. För en enkelten Atomkarn kann aver nich vörutseggt warrn, wanneer de verfallt - een kann blots en <a href="/w/index.php?title=Wohrschienlichkeit&action=edit&redlink=1" class="new" title="Wohrschienlichkeit (Siet noch nich vörhannen)">Wohrschienlichkeit</a> angeven för en Ümwanneln in en vörgeven Tiet (Verfallswohrschienlichkeit oder Verfallskonstante λ). Dorbi is de Wohrschienlichkeit för en Verfall binnen de eersten Halfweertstiet 50 %, binnen twee Halfweertstieten 75 %, binnen dree Halfweertstieten 87,5 % usw. </p> <div class="mw-heading mw-heading2"><h2 id="Verfallsgesett">Verfallsgesett</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=2" title="Ännere Afsnitt: Verfallsgesett" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=2" title="Quellcode des Abschnitts bearbeiten: Verfallsgesett"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>De Wohrschienlichkeit för en radioaktiven Verfall kann mathemaatsch as Formel utdrückt warrn. Annahmen, dor is en radioaktiven Stoff mit <i>N</i><sub>0</sub> <a href="/wiki/Atomkarn" class="mw-redirect" title="Atomkarn">Atomkarns</a> un de <a href="/wiki/Aktivit%C3%A4t_(Physik)" title="Aktivität (Physik)">Aktivität</a> <i>A</i>. För de Tall vun Atomkarns d<i>N</i> de in de Tiet d<i>t</i> verfallen sünd, gellt denn: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle A=-{\frac {\mathrm {d} N}{\mathrm {d} t}}\qquad {\text{mit}}\qquad A=\lambda \cdot N}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>A</mi> <mo>=</mo> <mo>−</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>N</mi> </mrow> <mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>t</mi> </mrow> </mfrac> </mrow> <mspace width="2em" /> <mrow class="MJX-TeXAtom-ORD"> <mtext>mit</mtext> </mrow> <mspace width="2em" /> <mi>A</mi> <mo>=</mo> <mi>λ</mi> <mo>⋅</mo> <mi>N</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle A=-{\frac {\mathrm {d} N}{\mathrm {d} t}}\qquad {\text{mit}}\qquad A=\lambda \cdot N}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/eaef3119ad39dcdaeaaaf5d884da7bbe1f888b7f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:33.559ex; height:5.509ex;" alt="{\displaystyle A=-{\frac {\mathrm {d} N}{\mathrm {d} t}}\qquad {\text{mit}}\qquad A=\lambda \cdot N}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle -\lambda \cdot N={\frac {\mathrm {d} N}{\mathrm {d} t}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mo>−</mo> <mi>λ</mi> <mo>⋅</mo> <mi>N</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>N</mi> </mrow> <mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>t</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle -\lambda \cdot N={\frac {\mathrm {d} N}{\mathrm {d} t}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/741ee2a448fb8f87f43048acf6568f39b646fe13" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:14.197ex; height:5.509ex;" alt="{\displaystyle -\lambda \cdot N={\frac {\mathrm {d} N}{\mathrm {d} t}}}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle -\lambda \cdot \mathrm {d} t={\frac {1}{N}}\cdot \mathrm {d} N}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mo>−</mo> <mi>λ</mi> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>t</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>N</mi> </mfrac> </mrow> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>N</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle -\lambda \cdot \mathrm {d} t={\frac {1}{N}}\cdot \mathrm {d} N}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2513188cd0d7ad3a7fa82f88a5b9905734ff7bb6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:18.008ex; height:5.176ex;" alt="{\displaystyle -\lambda \cdot \mathrm {d} t={\frac {1}{N}}\cdot \mathrm {d} N}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \int _{0}^{t}-\lambda \cdot \mathrm {d} t'=\int _{N_{0}}^{N}{\frac {1}{N'}}\cdot \mathrm {d} N'}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msubsup> <mo>∫</mo> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>t</mi> </mrow> </msubsup> <mo>−</mo> <mi>λ</mi> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <msup> <mi>t</mi> <mo>′</mo> </msup> <mo>=</mo> <msubsup> <mo>∫</mo> <mrow class="MJX-TeXAtom-ORD"> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi>N</mi> </mrow> </msubsup> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <msup> <mi>N</mi> <mo>′</mo> </msup> </mfrac> </mrow> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <msup> <mi>N</mi> <mo>′</mo> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \int _{0}^{t}-\lambda \cdot \mathrm {d} t'=\int _{N_{0}}^{N}{\frac {1}{N'}}\cdot \mathrm {d} N'}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c773d3d487362be84778b46010f6b223e0615067" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:28.401ex; height:6.509ex;" alt="{\displaystyle \int _{0}^{t}-\lambda \cdot \mathrm {d} t'=\int _{N_{0}}^{N}{\frac {1}{N'}}\cdot \mathrm {d} N'}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle -\lambda t=\ln \left({\frac {N}{N_{0}}}\right)}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mo>−</mo> <mi>λ</mi> <mi>t</mi> <mo>=</mo> <mi>ln</mi> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>N</mi> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mfrac> </mrow> <mo>)</mo> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle -\lambda t=\ln \left({\frac {N}{N_{0}}}\right)}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/46ffa1568fe60902d4824454af21111d6701af83" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:16.219ex; height:6.176ex;" alt="{\displaystyle -\lambda t=\ln \left({\frac {N}{N_{0}}}\right)}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle e^{-\lambda t}={\frac {N}{N_{0}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>−</mo> <mi>λ</mi> <mi>t</mi> </mrow> </msup> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>N</mi> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle e^{-\lambda t}={\frac {N}{N_{0}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8f81b7097917c6b335033d3660a8dea0d5929d47" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:11.001ex; height:5.676ex;" alt="{\displaystyle e^{-\lambda t}={\frac {N}{N_{0}}}}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle N(t)=N_{0}\cdot e^{-\lambda t}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>N</mi> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo>=</mo> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo>⋅</mo> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>−</mo> <mi>λ</mi> <mi>t</mi> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N(t)=N_{0}\cdot e^{-\lambda t}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/0bae1d3ac280e8478683d9e90639a9ec2f546bd4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:16.557ex; height:3.176ex;" alt="{\displaystyle N(t)=N_{0}\cdot e^{-\lambda t}}"></span></dd></dl> <p>Na dit Verfallsgesett sünd also na de <a href="/wiki/Tiet" title="Tiet">Tiet</a> <i>t</i> vun de Utgangskarns <i>N</i><sub>0</sub> noch <i>N</i>(<i>t</i>) över. </p><p>Wo gau de Verfall aflöpt, warrt dör de Verfallskonstante λ (<a href="/wiki/Lambda" title="Lambda">Lambda</a>) fastleggt. Dat is de <a href="/wiki/Kehrweert" title="Kehrweert">Kehrweert</a> vun de middleren <a href="/w/index.php?title=Levensduer_(Physik)&action=edit&redlink=1" class="new" title="Levensduer (Physik) (Siet noch nich vörhannen)">Levensduer</a> vun’n Karn τ = 1/λ, also de Tiet, na denn de Tall vun Atomen üm den Fakter <i>e</i> lütter worrn is. τ ünnerscheedt sik vun de Halftweertstiet t<sub>½</sub> blots üm den konstanten Fakter ln(2): t<sub>½</sub> = τ · ln(2) ≈ 0,693 · τ. </p> <div class="mw-heading mw-heading3"><h3 id="Statistik_vun’n_radioaktiven_Verfall"><span id="Statistik_vun.E2.80.99n_radioaktiven_Verfall"></span>Statistik vun’n radioaktiven Verfall</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=3" title="Ännere Afsnitt: Statistik vun’n radioaktiven Verfall" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=3" title="Quellcode des Abschnitts bearbeiten: Statistik vun’n radioaktiven Verfall"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>De radioaktive Verfallsproportschoon, de ok as <a href="/wiki/Aktivit%C3%A4t_(Physik)" title="Aktivität (Physik)">Aktivität</a> betekent warrt, is de Middelweert vun de Tall vun Verfäll in en geven Tietafsnitt. De wohrhaftige Tall vun Verfäll in disse fasten Tieteenheit folgt de <a href="/w/index.php?title=Poisson-Verdelen&action=edit&redlink=1" class="new" title="Poisson-Verdelen (Siet noch nich vörhannen)">Poisson-Verdelen</a>, de sik bi grode middlere Tall dör en <a href="/w/index.php?title=Gauss-Verdelen&action=edit&redlink=1" class="new" title="Gauss-Verdelen (Siet noch nich vörhannen)">Gauss-Verdelen</a> neeger kamen lett. </p> <div class="mw-heading mw-heading2"><h2 id="Mathemaatsche_Definitschoon_vun_de_Halfweertstiet">Mathemaatsche Definitschoon vun de Halfweertstiet</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=4" title="Ännere Afsnitt: Mathemaatsche Definitschoon vun de Halfweertstiet" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=4" title="Quellcode des Abschnitts bearbeiten: Mathemaatsche Definitschoon vun de Halfweertstiet"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Allgemeen gellt för de Tiet <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle t_{\frac {1}{n}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle t_{\frac {1}{n}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c0d6f076a728510e91fcab9338f6a994ca70a122" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:2.709ex; height:3.509ex;" alt="{\displaystyle t_{\frac {1}{n}}}"></span>, na de de Utgangsmengde <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle N_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/5b6328fbe0cded37216c90735c89ee188be26a30" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.92ex; height:2.509ex;" alt="{\displaystyle N_{0}}"></span> op dat 1/<i>n</i>-facke (för de Halfweertstiet gellt <i>n</i>=2) affallen is: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle N(t_{\frac {1}{n}})={\frac {N_{0}}{n}}=N_{0}\cdot e^{-\lambda t_{\frac {1}{n}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>N</mi> <mo stretchy="false">(</mo> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> </mrow> </msub> <mo stretchy="false">)</mo> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mi>n</mi> </mfrac> </mrow> <mo>=</mo> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo>⋅</mo> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>−</mo> <mi>λ</mi> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> </mrow> </msub> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N(t_{\frac {1}{n}})={\frac {N_{0}}{n}}=N_{0}\cdot e^{-\lambda t_{\frac {1}{n}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8b80434e45bf9baa4ad8a611654ed4179a8fd21c" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:27.082ex; height:5.343ex;" alt="{\displaystyle N(t_{\frac {1}{n}})={\frac {N_{0}}{n}}=N_{0}\cdot e^{-\lambda t_{\frac {1}{n}}}}"></span></dd></dl> <p>Dorna warrt op beid Sieten dör <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle N_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/5b6328fbe0cded37216c90735c89ee188be26a30" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.92ex; height:2.509ex;" alt="{\displaystyle N_{0}}"></span> deelt un de <a href="/wiki/Logarithmus" title="Logarithmus">Logarithmus</a> billt. </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \ln \left({\frac {1}{n}}\right)=-\lambda \cdot t_{\frac {1}{n}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ln</mi> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> </mrow> <mo>)</mo> </mrow> <mo>=</mo> <mo>−</mo> <mi>λ</mi> <mo>⋅</mo> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \ln \left({\frac {1}{n}}\right)=-\lambda \cdot t_{\frac {1}{n}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/16a31ddb35de2910eb63b95e15e22d022b280244" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:18.241ex; height:6.176ex;" alt="{\displaystyle \ln \left({\frac {1}{n}}\right)=-\lambda \cdot t_{\frac {1}{n}}}"></span></dd></dl> <p>Ünner de Acht vun de Logarithmusgesetten folgt dorut: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle t_{\frac {1}{n}}={\frac {\ln \left(n\right)}{\lambda }}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mi>n</mi> </mfrac> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>ln</mi> <mo>⁡</mo> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow> <mi>λ</mi> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle t_{\frac {1}{n}}={\frac {\ln \left(n\right)}{\lambda }}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/879f409ec0d2ae2c75bd29311d954e36542e8776" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:11.787ex; height:5.843ex;" alt="{\displaystyle t_{\frac {1}{n}}={\frac {\ln \left(n\right)}{\lambda }}}"></span></dd></dl> <p>För de Halfweertstiet gellt in’n sünneren Fall <i>n</i>=2: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle t_{\frac {1}{2}}={\frac {\ln \left(2\right)}{\lambda }}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>ln</mi> <mo>⁡</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> <mi>λ</mi> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle t_{\frac {1}{2}}={\frac {\ln \left(2\right)}{\lambda }}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f86209308f5d0b1a74cac8f16e2376cedc15872b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.171ex; width:11.421ex; height:6.009ex;" alt="{\displaystyle t_{\frac {1}{2}}={\frac {\ln \left(2\right)}{\lambda }}}"></span></dd></dl> <p>Dorut gellt för dat Verfallsgesett: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle N(t)=N_{0}\cdot e^{-\lambda \cdot t}\qquad {\text{mit}}\qquad \lambda ={\frac {\ln \left(2\right)}{t_{1/2}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>N</mi> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo>=</mo> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo>⋅</mo> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>−</mo> <mi>λ</mi> <mo>⋅</mo> <mi>t</mi> </mrow> </msup> <mspace width="2em" /> <mrow class="MJX-TeXAtom-ORD"> <mtext>mit</mtext> </mrow> <mspace width="2em" /> <mi>λ</mi> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>ln</mi> <mo>⁡</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>2</mn> </mrow> </msub> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N(t)=N_{0}\cdot e^{-\lambda \cdot t}\qquad {\text{mit}}\qquad \lambda ={\frac {\ln \left(2\right)}{t_{1/2}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/de2d698fd926a8c8a910cc70f041abd42de30f29" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.671ex; width:39.993ex; height:6.509ex;" alt="{\displaystyle N(t)=N_{0}\cdot e^{-\lambda \cdot t}\qquad {\text{mit}}\qquad \lambda ={\frac {\ln \left(2\right)}{t_{1/2}}}}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle N(t)=N_{0}\cdot e^{-{\frac {\ln \left(2\right)}{t_{1/2}}}\cdot t}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>N</mi> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo>=</mo> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo>⋅</mo> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>−</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <mi>ln</mi> <mo>⁡</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>2</mn> </mrow> </msub> </mfrac> </mrow> <mo>⋅</mo> <mi>t</mi> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N(t)=N_{0}\cdot e^{-{\frac {\ln \left(2\right)}{t_{1/2}}}\cdot t}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/41add3a6363dd1397e8fb7d1c7aac6e8dce44335" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:19.711ex; height:5.343ex;" alt="{\displaystyle N(t)=N_{0}\cdot e^{-{\frac {\ln \left(2\right)}{t_{1/2}}}\cdot t}}"></span></dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle N(t)=N_{0}\cdot e^{-\ln 2\cdot {\frac {t}{t_{1/2}}}}\qquad {\text{mit}}\qquad e^{-\ln 2}=e^{\ln {\frac {1}{2}}}={\frac {1}{2}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>N</mi> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo>=</mo> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo>⋅</mo> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>−</mo> <mi>ln</mi> <mo>⁡</mo> <mn>2</mn> <mo>⋅</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>t</mi> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>2</mn> </mrow> </msub> </mfrac> </mrow> </mrow> </msup> <mspace width="2em" /> <mrow class="MJX-TeXAtom-ORD"> <mtext>mit</mtext> </mrow> <mspace width="2em" /> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mo>−</mo> <mi>ln</mi> <mo>⁡</mo> <mn>2</mn> </mrow> </msup> <mo>=</mo> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>ln</mi> <mo>⁡</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> </mrow> </msup> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N(t)=N_{0}\cdot e^{-\ln 2\cdot {\frac {t}{t_{1/2}}}}\qquad {\text{mit}}\qquad e^{-\ln 2}=e^{\ln {\frac {1}{2}}}={\frac {1}{2}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/5b8f9781ad867bde1a45f899ac15326ea4b70d5f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:52.996ex; height:5.843ex;" alt="{\displaystyle N(t)=N_{0}\cdot e^{-\ln 2\cdot {\frac {t}{t_{1/2}}}}\qquad {\text{mit}}\qquad e^{-\ln 2}=e^{\ln {\frac {1}{2}}}={\frac {1}{2}}}"></span> (<a href="/w/index.php?title=Exponentialgesetten&action=edit&redlink=1" class="new" title="Exponentialgesetten (Siet noch nich vörhannen)">Exponentialgesetten</a>)</dd></dl> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle N(t)=N_{0}\cdot \left({\frac {1}{2}}\right)^{\frac {t}{t_{1/2}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>N</mi> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> <mo>=</mo> <msub> <mi>N</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> <mo>⋅</mo> <msup> <mrow> <mo>(</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> <mo>)</mo> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>t</mi> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>2</mn> </mrow> </msub> </mfrac> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle N(t)=N_{0}\cdot \left({\frac {1}{2}}\right)^{\frac {t}{t_{1/2}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/5daca8f42c1ccf19d25ae572661d7f025f0f9326" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:21.516ex; height:7.176ex;" alt="{\displaystyle N(t)=N_{0}\cdot \left({\frac {1}{2}}\right)^{\frac {t}{t_{1/2}}}}"></span></dd></dl> <p>Dorut kann een nu seen, dat na de Halfweertstiet jüst de Hälft vun de anfänglichen Karms verfalln sünd. </p> <div class="mw-heading mw-heading2"><h2 id="Bispelen">Bispelen</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=5" title="Ännere Afsnitt: Bispelen" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=5" title="Quellcode des Abschnitts bearbeiten: Bispelen"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Radioaktive_Halfweertstiet">Radioaktive Halfweertstiet</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=6" title="Ännere Afsnitt: Radioaktive Halfweertstiet" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=6" title="Quellcode des Abschnitts bearbeiten: Radioaktive Halfweertstiet"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In de <a href="/wiki/Karnphysik" title="Karnphysik">Karnphysik</a> steiht de Halfweertstiet för de Tietduer, in de en Mengde vun en sünner’t radioaktiv <a href="/wiki/Nuklid" title="Nuklid">Nuklid</a> op de Hälft torüchgahn is, sikalso in annere Atomen ümwannelt hett. Jeed Nuklid hett sien egen Halfweertstiet as en Konstante. De Tosamenhang vun Mengde un Tiet is över dat Verfallsgesett fastleggt, as dat baven herleidt is. </p> <table class="Tabell"> <tbody><tr bgcolor="99bbff"> <th colspan="3">Halfweetstieten för en poor Isotopen </th></tr> <tr bgcolor="99bbff"> <th>Element</th> <th>Formelzeichen</th> <th>Halbwertszeit </th></tr> <tr> <td><a href="/wiki/Tellur" title="Tellur">Tellur</a></td> <td><sup>128</sup>Te</td> <td>ca. 7·10<sup>24</sup> Johr </td></tr> <tr> <td><a href="/wiki/Wismut" title="Wismut">Wismut</a></td> <td><sup>209</sup>Bi</td> <td>ca. 1,9·10<sup>19</sup> Johr </td></tr> <tr> <td><a href="/wiki/Thorium" title="Thorium">Thorium</a></td> <td><sup>232</sup>Th</td> <td>14,05 Mrd. Johr </td></tr> <tr> <td><a href="/wiki/Uran" title="Uran">Uran</a></td> <td><sup>238</sup>U</td> <td>4,468 Mrd. Johr </td></tr> <tr> <td><a href="/wiki/Uran" title="Uran">Uran</a></td> <td><sup>235</sup>U</td> <td>704 Mio. Johr </td></tr> <tr> <td><a href="/wiki/Plutonium" title="Plutonium">Plutonium</a></td> <td><sup>239</sup>Pu</td> <td>24.110 Johr </td></tr> <tr> <td><a href="/wiki/Kohlenstoff" title="Kohlenstoff">Kohlenstoff</a></td> <td><sup>14</sup>C</td> <td>5.730 Johr </td></tr> <tr> <td><a href="/wiki/Radium" title="Radium">Radium</a></td> <td><sup>226</sup>Ra</td> <td>1.602 Johr </td></tr> <tr> <td><a href="/wiki/Plutonium" title="Plutonium">Plutonium</a></td> <td><sup>238</sup>Pu</td> <td>87,74 Johr </td></tr> <tr> <td><a href="/wiki/C%C3%A4sium" title="Cäsium">Cäsium</a></td> <td><sup>137</sup>Cs</td> <td>30,2 Johr<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td><a href="/wiki/Tritium" title="Tritium">Tritium</a></td> <td><sup>3</sup>H</td> <td>12,36 Johr </td></tr> <tr> <td><a href="/wiki/Kobalt" title="Kobalt">Kobalt</a></td> <td><sup>60Co</sup></td> <td>5,3 Johr </td></tr> <tr> <td><a href="/wiki/Swevel" title="Swevel">Swevel</a></td> <td><sup>35</sup>S</td> <td>87,5 Daag </td></tr> <tr> <td><a href="/wiki/Radon" title="Radon">Radon</a></td> <td><sup>222</sup>Rn</td> <td>3,8 Daag </td></tr> <tr> <td><a href="/wiki/Francium" title="Francium">Francium</a></td> <td><sup>223</sup>Fr</td> <td>22 Minuuten </td></tr> <tr> <td><a href="/wiki/Thorium" title="Thorium">Thorium</a></td> <td><sup>223</sup>Th</td> <td>0,6 Sekunnen </td></tr> <tr> <td><a href="/wiki/Polonium" title="Polonium">Polonium</a></td> <td><sup>212</sup>Po</td> <td>0,3 µs </td></tr> <tr> <td><a href="/wiki/Beryllium" title="Beryllium">Beryllium</a></td> <td><sup>8</sup>Be</td> <td>9 · 10<sup>-17</sup> s<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </td></tr></tbody></table> <p>Rein na de Mathematik is en radioaktiven Stoff also nie vullstännig weg, man physikaalsch is mit dat Ümwanneln vun dat letzte Atom en Grenz sett un de Stoff is verswunnen. Faken warrt to’n Afschätzen, wanneer en radioaktive Strahlen keen Bedüden mehr hett för den Minsch oder de Ümwelt, de teihnfacke Halfweertstiet nahmen. Dat heet, dat de Mengde op dat 2<sup>-10</sup>-facke (= <sup>1</sup>/<sub>1024</sub>) rünner gahn is. </p><p>Bi de Opnahm vun radioaktive Stoffen in’n Lief spellt aver nich alleen blots de Halfweertstiet in’n physikaalschen Sinn en Rull, man ok dat Wedderutscheden vun den Stoff dör den bioloogschen Stoffwessel. Ok de kann in enkelte Fäll na en Exponentialgesett aflopen un dormit dör en Halfweertstiet beschreven warrn. Man mutt in den Fall tüschen de physikaalschen un de bioloogschen Halfweertstiet ünnerscheden. </p> <div class="mw-heading mw-heading3"><h3 id="Radiokarbonmethood">Radiokarbonmethood</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=7" title="Ännere Afsnitt: Radiokarbonmethood" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=7" title="Quellcode des Abschnitts bearbeiten: Radiokarbonmethood"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><i>Hööftartikel</i>: <a href="/w/index.php?title=Radiokarbonmethood&action=edit&redlink=1" class="new" title="Radiokarbonmethood (Siet noch nich vörhannen)">Radiokarbonmethood</a> </p><p>Dat radioaktive Kohlenstoff<a href="/wiki/Isotop" title="Isotop">isotop</a> <sup>14</sup>C kummt in uns Atmosphäär in en faste Proportschoon to dat bestännige Isotop <sup>12</sup>C in’t <a href="/wiki/Kohlenstoffdioxid" title="Kohlenstoffdioxid">Kohlenstoffdioxid</a> vör. In de glieke Proportschoon kummt dat Kohlenstoffisotop ok in orgaansch Materie vör, wieldat Kohlenstoff bi de <a href="/w/index.php?title=Photosynthess&action=edit&redlink=1" class="new" title="Photosynthess (Siet noch nich vörhannen)">Photosynthess</a> in de Biomasse vun de Planten un över de Nehrmiddelkeed ok in’n Lief vun all Leevwesen inboot warrt. Wenn nu en Organismus dood blifft, warrt keen nee <sup>14</sup>C mehr opnahmen, un disse Andeel in’n Lief warrt nu över den radioaktiven Verfall exponentiell weniger mit en Halfweertstiet vun 5730 Johren. Över de <a href="/w/index.php?title=Radiokarbonmethood&action=edit&redlink=1" class="new" title="Radiokarbonmethood (Siet noch nich vörhannen)">Radiokarbonmethood</a> oder ok C-14-Methood kann de restliche Andeel vun dat radioaktive Kohlenstoffisotop bestimmt un över de Proportschoon to dat bestännige <sup>12</sup>C utrekent warrn, wo lang de Organismus al dood is. </p><p>To’n Bispeel warrt bi’n ollen Balken vun en histoorsch Huus faststellt, dat noch 90 % vun’t oorsprüngliche <sup>14</sup>C in de frischen Planten-Biomasse över sünd. För de Tiet, de sietdem vergahn is, gellt also: </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle t=t_{1/2}\cdot \log _{2}(0{,}9)=5730\ \mathrm {a} \cdot \log _{2}\left(0{,}9\right)=-870{,}98\ \mathrm {a} }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>t</mi> <mo>=</mo> <msub> <mi>t</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>1</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>/</mo> </mrow> <mn>2</mn> </mrow> </msub> <mo>⋅</mo> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> <mo>⁡</mo> <mo stretchy="false">(</mo> <mn>0</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>,</mo> </mrow> <mn>9</mn> <mo stretchy="false">)</mo> <mo>=</mo> <mn>5730</mn> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">a</mi> </mrow> <mo>⋅</mo> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> <mo>⁡</mo> <mrow> <mo>(</mo> <mrow> <mn>0</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>,</mo> </mrow> <mn>9</mn> </mrow> <mo>)</mo> </mrow> <mo>=</mo> <mo>−</mo> <mn>870</mn> <mrow class="MJX-TeXAtom-ORD"> <mo>,</mo> </mrow> <mn>98</mn> <mtext> </mtext> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">a</mi> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle t=t_{1/2}\cdot \log _{2}(0{,}9)=5730\ \mathrm {a} \cdot \log _{2}\left(0{,}9\right)=-870{,}98\ \mathrm {a} }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8e02555a3806f133fbebc5cea2a2d4b63be69e32" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.171ex; width:51.048ex; height:3.176ex;" alt="{\displaystyle t=t_{1/2}\cdot \log _{2}(0{,}9)=5730\ \mathrm {a} \cdot \log _{2}\left(0{,}9\right)=-870{,}98\ \mathrm {a} }"></span></dd></dl> <p>Dat heet nix anners, as dat de Boom, ut den de Balken maakt worrn is, vör ruchweg 871 Johren daalhaut weer. </p><p>Man, natürlich is de Öllersbestimmen nich op dat Johr nipp un nau. Wo goot dat henhaut is afhangig vun de Mengde vun Material, de för de Proov praat steiht, de Meetduer un de Kalibreeren för den Tietruum. De bruukten Redschoppen hebbt ünnerscheedlich Bedingen. In jüngerer Tiet warrt de Ünnersöken ok komplizeerter, wieldat de Andeel vun C-14 dör bövereerdsche Atomwapenversöken kortfristig anstegen is. Op de annern Siet stiggt aver ok de C-12-Anteil dör’t massenhafte Opböten vun fossile Energiedrägers. Sünners Fundstücken in de Neeg vun Autobahnen warrt dordör bannig swor. </p> <div class="mw-heading mw-heading3"><h3 id="Bioloogsch_Halfweertstiet">Bioloogsch Halfweertstiet</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=8" title="Ännere Afsnitt: Bioloogsch Halfweertstiet" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=8" title="Quellcode des Abschnitts bearbeiten: Bioloogsch Halfweertstiet"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>De <a href="/w/index.php?title=Bioloogsch_Halfweertstiet&action=edit&redlink=1" class="new" title="Bioloogsch Halfweertstiet (Siet noch nich vörhannen)">bioloogsche Halfweertstiet</a> (ok <i>Eliminatschoonshalfweertstiet</i> nöömt) betekent in’n Sünnern de Tiet <i>t</i><sub>1/2</sub> in de en in en bioloogsch <a href="/wiki/Organismus_(Biologie)" title="Organismus (Biologie)">Organismus</a> (Plant, Deer, Minsch, Eenzeller) <a href="/w/index.php?title=Inkorporatschoon&action=edit&redlink=1" class="new" title="Inkorporatschoon (Siet noch nich vörhannen)">inlagerten</a> radioaktiven, giftigen oder <a href="/w/index.php?title=Pharmazie&action=edit&redlink=1" class="new" title="Pharmazie (Siet noch nich vörhannen)">pharmazeutischen</a> Stoff dör’t Tosamenspeel vun all bioloogschen un physikaalschen Vörgäng (Utscheden, Stoffwessel, Verfall usw.) op de Hälft rünnergahn is. </p><p>In de <a href="/w/index.php?title=Pharmakokinetik&action=edit&redlink=1" class="new" title="Pharmakokinetik (Siet noch nich vörhannen)">Pharmakokinetik</a> warrt as de Halfweertstiet de Tiet betekent, in de de Hälft vun en opnahmen Heelmiddel dör Stoffwessel verbruukt oder utscheedt worrn is. Vun wegen, dat sik de bioloogsche Halfweertstiet ut verscheden Vörgäng tohopensett, de deelwies ünnerscheedliche Afhangigkeiten vun de Konzentratschoon hebbt, is se nich jümmer unafhangig vun de Utgangskonzentratschoon vun’n ünnersöchten Stoff. </p> <div class="mw-heading mw-heading3"><h3 id="Effektiv_Halfweertstiet">Effektiv Halfweertstiet</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=9" title="Ännere Afsnitt: Effektiv Halfweertstiet" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=9" title="Quellcode des Abschnitts bearbeiten: Effektiv Halfweertstiet"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In de <a href="/w/index.php?title=Effektiv_Halfweertstiet&action=edit&redlink=1" class="new" title="Effektiv Halfweertstiet (Siet noch nich vörhannen)">effektive Halfweertstiet</a> geiht de physikaalsche jüst so as de bioloogsche Halfweertstiet in. </p> <div class="mw-heading mw-heading3"><h3 id="Bibliometrisch_Halfweertstiet">Bibliometrisch Halfweertstiet</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=10" title="Ännere Afsnitt: Bibliometrisch Halfweertstiet" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=10" title="Quellcode des Abschnitts bearbeiten: Bibliometrisch Halfweertstiet"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In de <a href="/w/index.php?title=Bibliometrie&action=edit&redlink=1" class="new" title="Bibliometrie (Siet noch nich vörhannen)">Bibliometrie</a> warrt bi’t Ünnersöken vun <a href="/w/index.php?title=Publikatschoon&action=edit&redlink=1" class="new" title="Publikatschoon (Siet noch nich vörhannen)">Publikatschonen</a> verscheden Halfweertstieten faststellt. <i>Brooks</i> hett as een vun de eersten Halfweertstieten op dit Rebeet ünnersöcht. </p><p>De Halfweertstiet vun <a href="/wiki/Literatur" title="Literatur">Literatur</a> liggt bi ruchweg fief Johr. Dat gellt för Lesen sülvst, aver ok för de Tall vun <a href="/w/index.php?title=Zitatschoon&action=edit&redlink=1" class="new" title="Zitatschoon (Siet noch nich vörhannen)">Zitatschonen</a>. Dat heet, dat en schreven Wark in’n Dörsnitt jeed Johr üm ruchweg 14 % weniger faken ut en <a href="/wiki/Bibliotheek" class="mw-redirect" title="Bibliotheek">Bibliotheek</a> utlehnt oder ziteert warrt as in’t Johr dorvör. Dorvun utnahmen sünd Klassiker un de neesten Warken. </p><p>De Halfweertstiet vun <a href="/w/index.php?title=Weblenk&action=edit&redlink=1" class="new" title="Weblenk (Siet noch nich vörhannen)">Weblenken</a> liggt ruchweg bi 51 Maanden. Dat bedüüdt, dat na een Johr üm un bi 15 % vun all Weblenken nich mehr gellt. </p> <div class="mw-heading mw-heading3"><h3 id="Halfweertstiet_bi_Autopriesen">Halfweertstiet bi Autopriesen</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=11" title="Ännere Afsnitt: Halfweertstiet bi Autopriesen" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=11" title="Quellcode des Abschnitts bearbeiten: Halfweertstiet bi Autopriesen"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>De Wedderverkoppsweert vun en Auto geiht ok ruchweg exponentiell mit sien Öller na ünnen bi en Halfweertstiet vun 4-5 Johren. Wenn to’n Bispeel en Neewagen 20.000 € köst, hett dat glieke Modell na veer Johr noch’n Weert vun 10.000 € un na acht Johr vun ruchweg 5.000 €. </p> <div class="mw-heading mw-heading2"><h2 id="Borns">Borns</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Halfweertstiet&veaction=edit&section=12" title="Ännere Afsnitt: Borns" class="mw-editsection-visualeditor"><span>ännern</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Halfweertstiet&action=edit&section=12" title="Quellcode des Abschnitts bearbeiten: Borns"><span>Bornkood ännern</span></a><span class="mw-editsection-bracket">]</span></span></div> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"> Physical Review D, Vol. 50, Number 3, 1. Aug. 1994, Review of Particle Properties, p1270</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external free" href="http://atom.kaeri.re.kr/cgi-bin/nuclide?nuc=Be-8">http://atom.kaeri.re.kr/cgi-bin/nuclide?nuc=Be-8</a> </span> </li> </ol>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Vun „<a dir="ltr" href="https://nds.wikipedia.org/w/index.php?title=Halfweertstiet&oldid=872832">https://nds.wikipedia.org/w/index.php?title=Halfweertstiet&oldid=872832</a>“</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Spezial:Kategorien" title="Spezial:Kategorien">Kategorien</a>: <ul><li><a href="/wiki/Kategorie:Karnphysik" title="Kategorie:Karnphysik">Karnphysik</a></li><li><a href="/wiki/Kategorie:Radioaktivit%C3%A4t" title="Kategorie:Radioaktivität">Radioaktivität</a></li><li><a href="/w/index.php?title=Kategorie:Strahlenschuul&action=edit&redlink=1" class="new" title="Kategorie:Strahlenschuul (Siet noch nich vörhannen)">Strahlenschuul</a></li><li><a href="/wiki/Kategorie:Pharmazie" title="Kategorie:Pharmazie">Pharmazie</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Disse Siet is toletzt üm 16:44, 21. 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