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[r]" accesskey="r"><span>Скорешни промени</span></a></li><li id="n-pump" class="mw-list-item"><a href="/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%98%D0%B0:%D0%A1%D0%B5%D0%BB%D1%81%D0%BA%D0%B0_%D1%87%D0%B5%D1%88%D0%BC%D0%B0"><span>Селска чешма</span></a></li><li id="n-Викисредби" class="mw-list-item"><a href="/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%98%D0%B0:%D0%92%D0%B8%D0%BA%D0%B8%D1%81%D1%80%D0%B5%D0%B4%D0%B1%D0%B0"><span>Викисредби</span></a></li><li id="n-help" class="mw-list-item"><a href="https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents" title="Место каде што може да се информирате."><span>Помош</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/%D0%93%D0%BB%D0%B0%D0%B2%D0%BD%D0%B0_%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%86%D0%B0" 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="Википедија" src="/static/images/mobile/copyright/wikipedia-wordmark-sr.svg" style="width: 7.8125em; height: 1.4375em;"> <img class="mw-logo-tagline" alt="Слободна енциклопедија" src="/static/images/mobile/copyright/wikipedia-tagline-mk.svg" width="114" height="11" style="width: 7.125em; height: 0.6875em;"> </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/%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B0:%D0%91%D0%B0%D1%80%D0%B0%D1%98" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Пребарај низ Википедија [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Пребарај</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="Пребарајте по Википедија" aria-label="Пребарајте по Википедија" autocapitalize="sentences" title="Пребарај низ Википедија [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Специјална:Барај"> </div> <button class="cdx-button cdx-search-input__end-button">Пребарај</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Лични алатки"> <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="Изглед"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Сменете ги големината на фонтот, ширината и бојата" > <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="Изглед" > <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">Изглед</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_mk.wikipedia.org&uselang=mk" class=""><span>Дарување</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=%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B0:%D0%A1%D0%BE%D0%B7%D0%B4%D0%B0%D1%98%D0%9A%D0%BE%D1%80%D0%B8%D1%81%D0%BD%D0%B8%D1%87%D0%BA%D0%B0%D0%A1%D0%BC%D0%B5%D1%82%D0%BA%D0%B0&returnto=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40" title="Ви препорачуваме да направите сметка и да се најавите, иако тоа не е задолжително" class=""><span>Направи сметка</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B0:%D0%9D%D0%B0%D1%98%D0%B0%D0%B2%D1%83%D0%B2%D0%B0%D1%9A%D0%B5&returnto=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40" title="Ви препорачуваме да се најавите, иако тоа не е задолжително. [o]" accesskey="o" class=""><span>Најава</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Повеќе можности" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Лични алатки" > <label id="vector-user-links-dropdown-label" for="vector-user-links-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-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Лични алатки</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Корисничко мени" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_mk.wikipedia.org&uselang=mk"><span>Дарување</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B0:%D0%A1%D0%BE%D0%B7%D0%B4%D0%B0%D1%98%D0%9A%D0%BE%D1%80%D0%B8%D1%81%D0%BD%D0%B8%D1%87%D0%BA%D0%B0%D0%A1%D0%BC%D0%B5%D1%82%D0%BA%D0%B0&returnto=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40" title="Ви препорачуваме да направите сметка и да се најавите, иако тоа не е задолжително"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Направи сметка</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B0:%D0%9D%D0%B0%D1%98%D0%B0%D0%B2%D1%83%D0%B2%D0%B0%D1%9A%D0%B5&returnto=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40" title="Ви препорачуваме да се најавите, иако тоа не е задолжително. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Најава</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Страници за одјавени уредници <a href="/wiki/%D0%9F%D0%BE%D0%BC%D0%BE%D1%88:%D0%92%D0%BE%D0%B2%D0%B5%D0%B4" aria-label="Дознајте повеќе за уредувањето"><span>дознајте повеќе</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B0:%D0%9C%D0%BE%D0%B8%D0%9F%D1%80%D0%B8%D0%B4%D0%BE%D0%BD%D0%B5%D1%81%D0%B8" title="Список на уредувања направени од оваа IP-адреса [y]" accesskey="y"><span>Придонеси</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B0:%D0%9C%D0%BE%D1%98%D0%A0%D0%B0%D0%B7%D0%B3%D0%BE%D0%B2%D0%BE%D1%80" title="Разговор за уредувањата од оваа IP-адреса [n]" accesskey="n"><span>Разговор</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"><div id="mw-dismissablenotice-anonplace"></div><script>(function(){var node=document.getElementById("mw-dismissablenotice-anonplace");if(node){node.outerHTML="\u003Cdiv class=\"mw-dismissable-notice\"\u003E\u003Cdiv class=\"mw-dismissable-notice-close\"\u003E[\u003Ca tabindex=\"0\" role=\"button\"\u003Eтргни\u003C/a\u003E]\u003C/div\u003E\u003Cdiv class=\"mw-dismissable-notice-body\"\u003E\u003C!-- CentralNotice --\u003E\u003Cdiv id=\"localNotice\" data-nosnippet=\"\"\u003E\u003Cdiv class=\"anonnotice\" lang=\"mk\" dir=\"ltr\"\u003E\u003Cdiv 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/\u003E\u003C/a\u003E\u003Cfigcaption\u003EУредувачки ден „Меѓународни награди“\u003C/figcaption\u003E\u003C/figure\u003E\n\u003Cp\u003EСе известуваат сите заинтересирани уредници на Википедија на македонски јазик дека на 26 ноември 2024 година ќе се одржи \u003Ca href=\"/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%98%D0%B0:%D0%A3%D1%80%D0%B5%D0%B4%D1%83%D0%B2%D0%B0%D1%87%D0%BA%D0%B8_%D0%B4%D0%B5%D0%BD%D0%BE%D0%B2%D0%B8\" title=\"Википедија:Уредувачки денови\"\u003Eуредувачки ден\u003C/a\u003E на тема „\u003Cb\u003E\u003Ca href=\"/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%98%D0%B0:%D0%A3%D1%80%D0%B5%D0%B4%D1%83%D0%B2%D0%B0%D1%87%D0%BA%D0%B8_%D0%B4%D0%B5%D0%BD%D0%BE%D0%B2%D0%B8_2024#Меѓународни_награди\" title=\"Википедија:Уредувачки денови 2024\"\u003EМеѓународни награди\u003C/a\u003E\u003C/b\u003E“.\n\u003Cbr style=\"clear:both;\" /\u003E\n\u003C/p\u003E\n\u003Cfigure class=\"mw-halign-left\" typeof=\"mw:File\"\u003E\u003Ca href=\"/wiki/%D0%9F%D0%BE%D0%B4%D0%B0%D1%82%D0%BE%D1%82%D0%B5%D0%BA%D0%B0:Wikipe-tan_mopping.png\" class=\"mw-file-description\"\u003E\u003Cimg src=\"//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Wikipe-tan_mopping.png/25px-Wikipe-tan_mopping.png\" decoding=\"async\" width=\"25\" height=\"30\" class=\"mw-file-element\" srcset=\"//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Wikipe-tan_mopping.png/38px-Wikipe-tan_mopping.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Wikipe-tan_mopping.png/50px-Wikipe-tan_mopping.png 2x\" data-file-width=\"1800\" data-file-height=\"2149\" /\u003E\u003C/a\u003E\u003Cfigcaption\u003E\u003C/figcaption\u003E\u003C/figure\u003E\n\u003Cp\u003EСе известуваат сите заинтересирани уредници дека во периодот од 4 ноември до 3 декември 2024 година се одржува \u003Ca href=\"/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%98%D0%B0:%D0%A3%D1%80%D0%B5%D0%B4%D1%83%D0%B2%D0%B0%D1%87%D0%BA%D0%B8_%D0%BD%D0%B0%D1%82%D0%BF%D1%80%D0%B5%D0%B2%D0%B0%D1%80%D0%B8\" title=\"Википедија:Уредувачки натпревари\"\u003Eуредувачки натпревар\u003C/a\u003E за \u003Cb\u003E\u003Ca href=\"/wiki/%D0%92%D0%B8%D0%BA%D0%B8%D0%BF%D0%B5%D0%B4%D0%B8%D1%98%D0%B0:%D0%A3%D1%80%D0%B5%D0%B4%D1%83%D0%B2%D0%B0%D1%87%D0%BA%D0%B8_%D0%BD%D0%B0%D1%82%D0%BF%D1%80%D0%B5%D0%B2%D0%B0%D1%80%D0%B8/%D0%A1%D1%80%D0%B5%D0%B4%D1%83%D0%B2%D0%B0%D1%9A%D0%B5_(2024)\" title=\"Википедија:Уредувачки натпревари/Средување (2024)\"\u003Eсредување на статии\u003C/a\u003E\u003C/b\u003E. Прочитајте ги правилата и вклучете се!\n\u003C/p\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E\u003C/div\u003E";}}());</script></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Мрежно место"> <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="Содржина" 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">Содржина</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">премести во страничникот</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">скриј</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">Почеток</div> </a> </li> <li id="toc-Датирање_со_помош_на_калиум-аргон" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Датирање_со_помош_на_калиум-аргон"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Датирање со помош на калиум-аргон</span> </div> </a> <ul id="toc-Датирање_со_помош_на_калиум-аргон-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Придонес_кон_природната_радиоактивност" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Придонес_кон_природната_радиоактивност"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Придонес кон природната радиоактивност</span> </div> </a> <ul id="toc-Придонес_кон_природната_радиоактивност-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Поврзано" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Поврзано"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Поврзано</span> </div> </a> <ul id="toc-Поврзано-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Наводи" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Наводи"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Наводи</span> </div> </a> <ul id="toc-Наводи-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Надворешни_врски" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Надворешни_врски"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Надворешни врски</span> </div> </a> <ul id="toc-Надворешни_врски-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="Содржина" 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="Прик./скр. содржина" > <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">Прик./скр. содржина</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">Калиум-40</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="Појдете на статија на друг јазик. Достапно на 19 јазици" > <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-19" 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">19 јазици</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/Kalium-40" title="Kalium-40 — африканс" lang="af" hreflang="af" data-title="Kalium-40" data-language-autonym="Afrikaans" data-language-local-name="африканс" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Potassi_40" title="Potassi 40 — каталонски" lang="ca" hreflang="ca" data-title="Potassi 40" data-language-autonym="Català" data-language-local-name="каталонски" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Drasl%C3%ADk-40" title="Draslík-40 — чешки" lang="cs" hreflang="cs" data-title="Draslík-40" data-language-autonym="Čeština" data-language-local-name="чешки" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Potassium-40" title="Potassium-40 — англиски" lang="en" hreflang="en" data-title="Potassium-40" data-language-autonym="English" data-language-local-name="англиски" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Potasio_40" title="Potasio 40 — шпански" lang="es" hreflang="es" data-title="Potasio 40" data-language-autonym="Español" data-language-local-name="шпански" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%BE%D8%AA%D8%A7%D8%B3%DB%8C%D9%85-%DB%B4%DB%B0" title="پتاسیم-۴۰ — персиски" lang="fa" hreflang="fa" data-title="پتاسیم-۴۰" data-language-autonym="فارسی" data-language-local-name="персиски" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Potassium_40" title="Potassium 40 — француски" lang="fr" hreflang="fr" data-title="Potassium 40" data-language-autonym="Français" data-language-local-name="француски" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko badge-Q70893996 mw-list-item" title=""><a href="https://ko.wikipedia.org/wiki/%EC%B9%BC%EB%A5%A8-40" title="칼륨-40 — корејски" lang="ko" hreflang="ko" data-title="칼륨-40" data-language-autonym="한국어" data-language-local-name="корејски" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Kalium-40" title="Kalium-40 — малајски" lang="ms" hreflang="ms" data-title="Kalium-40" data-language-autonym="Bahasa Melayu" data-language-local-name="малајски" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Kalium-40" title="Kalium-40 — холандски" lang="nl" hreflang="nl" data-title="Kalium-40" data-language-autonym="Nederlands" data-language-local-name="холандски" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%82%AB%E3%83%AA%E3%82%A6%E3%83%A040" title="カリウム40 — јапонски" lang="ja" hreflang="ja" data-title="カリウム40" data-language-autonym="日本語" data-language-local-name="јапонски" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Pot%C3%A1ssio-40" title="Potássio-40 — португалски" lang="pt" hreflang="pt" data-title="Potássio-40" data-language-autonym="Português" data-language-local-name="португалски" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9A%D0%B0%D0%BB%D0%B8%D0%B9-40" title="Калий-40 — руски" lang="ru" hreflang="ru" data-title="Калий-40" data-language-autonym="Русский" data-language-local-name="руски" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Kalium-40" title="Kalium-40 — фински" lang="fi" hreflang="fi" data-title="Kalium-40" data-language-autonym="Suomi" data-language-local-name="фински" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Kalium-40" title="Kalium-40 — шведски" lang="sv" hreflang="sv" data-title="Kalium-40" data-language-autonym="Svenska" data-language-local-name="шведски" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Potasyum-40" title="Potasyum-40 — турски" lang="tr" hreflang="tr" data-title="Potasyum-40" data-language-autonym="Türkçe" data-language-local-name="турски" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9A%D0%B0%D0%BB%D1%96%D0%B9-40" title="Калій-40 — украински" lang="uk" hreflang="uk" data-title="Калій-40" data-language-autonym="Українська" data-language-local-name="украински" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Kali-40" title="Kali-40 — виетнамски" lang="vi" hreflang="vi" data-title="Kali-40" data-language-autonym="Tiếng Việt" data-language-local-name="виетнамски" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E9%92%BE-40" title="钾-40 — кинески" lang="zh" hreflang="zh" data-title="钾-40" data-language-autonym="中文" data-language-local-name="кинески" class="interlanguage-link-target"><span>中文</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/Q2251076#sitelinks-wikipedia" title="Уредување на меѓујазични врски" class="wbc-editpage">Уреди врски</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="Именски простори"> <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/%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40" title="Преглед на содржинската страница [c]" accesskey="c"><span>Страница</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%D0%A0%D0%B0%D0%B7%D0%B3%D0%BE%D0%B2%D0%BE%D1%80:%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&action=edit&redlink=1" rel="discussion" class="new" title="Разговор за содржинската страница (страницата не постои) [t]" accesskey="t"><span>Разговор</span></a></li> </ul> </div> </div> <div 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[h]" accesskey="h"><span>Историја</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Алатки за страници"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="алатник" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">алатник</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header 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dir="ltr"><table class="infobox" style="width:22em"><caption>Калиум-40, <sup>40</sup>K</caption><tbody><tr><th colspan="2" style="text-align:center;background:#eee">Општо</th></tr><tr><th scope="row">Симбол</th><td><sup>40</sup>K</td></tr><tr><th scope="row">Име</th><td>калиум-40, K-40</td></tr><tr><th scope="row"><a href="/wiki/%D0%90%D1%82%D0%BE%D0%BC%D1%81%D0%BA%D0%B8_%D0%B1%D1%80%D0%BE%D1%98" title="Атомски број">Протони</a> <span style="font-weight:normal;">(<i>Z</i>)</span></th><td>19</td></tr><tr><th scope="row"><a href="/wiki/%D0%9D%D0%B5%D1%83%D1%82%D1%80%D0%BE%D0%BD" title="Неутрон">Неутрони</a> <span style="font-weight:normal;">(<i>N</i>)</span></th><td>21</td></tr><tr><th colspan="2" style="text-align:center;background:#eee"><a href="/wiki/%D0%9D%D1%83%D0%BA%D0%BB%D0%B8%D0%B4" title="Нуклид">Нуклидни податоци</a></th></tr><tr><th scope="row"><a href="/wiki/%D0%9F%D1%80%D0%B8%D1%80%D0%BE%D0%B4%D0%BD%D0%B0_%D0%B7%D0%B0%D1%81%D1%82%D0%B0%D0%BF%D0%B5%D0%BD%D0%BE%D1%81%D1%82" title="Природна застапеност">Природна застапеност</a></th><td>0,0117(1)%</td></tr><tr><th scope="row"><a href="/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">Период на полураспад</a> <span style="font-weight:normal;">(<i>t</i><sub>1/2</sub>)</span></th><td><span class="nowrap">(1,251 ± (3))⋅10<sup>9</sup> y</span></td></tr><tr><th scope="row"><a href="/wiki/%D0%90%D1%82%D0%BE%D0%BC%D1%81%D0%BA%D0%B0_%D0%BC%D0%B0%D1%81%D0%B0" title="Атомска маса">Изотопна маса</a></th><td>39,96399848(21) <a href="/wiki/%D0%94%D0%B0%D0%BB%D1%82%D0%BE%D0%BD_(%D0%B5%D0%B4%D0%B8%D0%BD%D0%B8%D1%86%D0%B0)" class="mw-redirect" title="Далтон (единица)">Da</a></td></tr><tr><th scope="row"><a href="/wiki/%D0%A1%D0%BF%D0%B8%D0%BD" class="mw-redirect" title="Спин">Спин</a></th><td>4<sup>−</sup></td></tr><tr><th scope="row">Вишок енергија</th><td><span class="nowrap">−33.505</span> <a href="/wiki/%D0%9A%D0%B8%D0%BB%D0%BE%D0%B5%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE%D0%BD%D0%B2%D0%BE%D0%BB%D1%82" class="mw-redirect" title="Килоелектронволт">keV</a></td></tr><tr><th scope="row"><a href="/wiki/%D0%95%D0%BD%D0%B5%D1%80%D0%B3%D0%B8%D1%98%D0%B0_%D0%BD%D0%B0_%D1%81%D0%B2%D1%80%D0%B7%D1%83%D0%B2%D0%B0%D1%9A%D0%B5" title="Енергија на сврзување">Енергија на сврзување</a></th><td><span class="nowrap">341.523</span> keV</td></tr><tr><td colspan="2" style="text-align:center;background:#eee"><a href="/w/index.php?title=%D0%98%D0%B7%D0%BE%D1%82%D0%BE%D0%BF%D0%B8_%D0%BD%D0%B0_%D0%BA%D0%B0%D0%BB%D0%B8%D1%83%D0%BC%D0%BE%D1%82&action=edit&redlink=1" class="new" title="Изотопи на калиумот (страницата не постои)">Изотопи на калиумот</a> <br /><a href="/w/index.php?title=%D0%A2%D0%B0%D0%B1%D0%B5%D0%BB%D0%B0_%D0%BD%D0%B0_%D0%BD%D1%83%D0%BA%D0%BB%D0%B8%D0%B4%D0%B8&action=edit&redlink=1" class="new" title="Табела на нуклиди (страницата не постои)">Целосна табела</a></td></tr></tbody></table> <p><b>Калиум-40 (<sup>40</sup>K)</b> — радиоактивен изотоп на калиумот, кој има многу долг <a href="/wiki/%D0%9F%D0%BE%D0%BB%D1%83%D1%80%D0%B0%D1%81%D0%BF%D0%B0%D0%B4" class="mw-redirect" title="Полураспад">полураспад</a> од 1.251 × 109 години. Тој го сочинува до 0,012% (120 ppm) од вкупната количина на калиум во природата. </p><p>Калиум-40 е редок пример на изотоп, кој е подлежен на три вида бета распаѓање. Околу 89.28% од времето, тој се распаѓа на калциум 40 (40Ca)со емисија на бета-честички (β-, електронот) со максимална енергија од 1,33 MeV и антинеутрони. Околу 10.72% од времето таа се распаѓа на аргон-40 (40Ar) од електронско зафаќање со емисија на 1.460 MeV гама-зраци и неутрино. Радиоактивното распаѓање на овој изотоп го објаснува фактот дека аргон е достапен како најевтин целосно благороден гас. Многу ретко (0,001% од времето) се распадне на 40Ar со емитуваање на позитрон (β +) и неутри. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Датирање_со_помош_на_калиум-аргон"><span id=".D0.94.D0.B0.D1.82.D0.B8.D1.80.D0.B0.D1.9A.D0.B5_.D1.81.D0.BE_.D0.BF.D0.BE.D0.BC.D0.BE.D1.88_.D0.BD.D0.B0_.D0.BA.D0.B0.D0.BB.D0.B8.D1.83.D0.BC-.D0.B0.D1.80.D0.B3.D0.BE.D0.BD"></span>Датирање со помош на калиум-аргон</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&veaction=edit&section=1" title="Уреди го одделот „Датирање со помош на калиум-аргон“" class="mw-editsection-visualeditor"><span>уреди</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&action=edit&section=1" title="Уреди изворен код на одделот: Датирање со помош на калиум-аргон"><span>уреди извор</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Калиум-40 е особено важен во калиум-аргон (К-Ar). Аргон е гас кој вообичаено не се комбинираа со други елементи. Значи, кога минералните форми - без разлика дали се од стопен камен или од супстанции растворени во вода - тоа на почетокот ќе биде аргон-слободна честичка, дури и ако има аргон во течноста. Меѓутоа, ако во минералот содржи каков било калиум, а потоа распаѓањето на изотопот моментално 40K ќе се создаде публикуван аргон-40, кој ќе остане затворен во минералот. Бидејќи стапката на која се случува оваа реализација е позната, можно е да се утврди изминатото време од формираниот минерал со мерење на односот на 40K и 40Ar атоми содржани во него. Аргонот, што се наоѓа во Земјината атмосфера е 99,6% 40Ar; за разлика од Сонцето - и се претпоставува дека во исконската материја, која кондензирала во планетите - е претежно 36Ar, со помалку од 15% од 38Ar. Следи дека повеќето од домашен аргон произлегува од калиум-40, кој се распаѓа во аргон-40, кој на крајот бега во атмосферата. </p> <div class="mw-heading mw-heading2"><h2 id="Придонес_кон_природната_радиоактивност"><span id=".D0.9F.D1.80.D0.B8.D0.B4.D0.BE.D0.BD.D0.B5.D1.81_.D0.BA.D0.BE.D0.BD_.D0.BF.D1.80.D0.B8.D1.80.D0.BE.D0.B4.D0.BD.D0.B0.D1.82.D0.B0_.D1.80.D0.B0.D0.B4.D0.B8.D0.BE.D0.B0.D0.BA.D1.82.D0.B8.D0.B2.D0.BD.D0.BE.D1.81.D1.82"></span>Придонес кон природната радиоактивност</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&veaction=edit&section=2" title="Уреди го одделот „Придонес кон природната радиоактивност“" class="mw-editsection-visualeditor"><span>уреди</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&action=edit&section=2" title="Уреди изворен код на одделот: Придонес кон природната радиоактивност"><span>уреди извор</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Еволуцијата на Земјината обвивка, радиактивен проток со текот на времето: придонес од 40К во црвено. Радиоактивното распаѓање на 40К во обвивката на Земјата рангирана на трето место, по 232Тh и 238U, како извор на радиоактивна топлина. Јадрото исто така е подлежно на содржина од радиоактивни извори, но колку е несигурно. Предложено е дека одредена јадрена радиоактивна (1-2 TW) може да достигне високи нивоа на U, Th и K. 40К е најголемиот извор на природна радиоактивност во животните, вклучувајќи го и човекот. А човеко тело од 70кг содржи околу 160грами на калиум, па оттука и за 0.000117 x 160 =0.0187грами од 40К, чие распаѓање произведува околу 4.900 40К е најголемиот извор на природна радиоактивност во животните, вклучувајќи го и човекот. А човеко тело од 70кг содржи околу 160грами на калиум, па оттука и за 0.000117 x 160 =0.0187грами од 40К, чие распаѓање произведува околу 4.900 уништувања во секунда (бекерели) континуирано во текот на животот на телото.<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><sup id="cite_ref-Samat_2-0" class="reference"><a href="#cite_note-Samat-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Поврзано"><span id=".D0.9F.D0.BE.D0.B2.D1.80.D0.B7.D0.B0.D0.BD.D0.BE"></span>Поврзано</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&veaction=edit&section=3" title="Уреди го одделот „Поврзано“" class="mw-editsection-visualeditor"><span>уреди</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&action=edit&section=3" title="Уреди изворен код на одделот: Поврзано"><span>уреди извор</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/w/index.php?title=%D0%98%D0%B7%D0%BE%D1%82%D0%BE%D0%BF%D0%B8_%D0%BD%D0%B0_%D0%BA%D0%B0%D0%BB%D0%B8%D1%83%D0%BC%D0%BE%D1%82&action=edit&redlink=1" class="new" title="Изотопи на калиумот (страницата не постои)">Изотопи на калиумот</a></li> <li><a href="/w/index.php?title=%D0%91%D0%B0%D0%BD%D0%B0%D0%BD%D1%81%D0%BA%D0%B0_%D0%B5%D0%BA%D0%B2%D0%B8%D0%B2%D0%B0%D0%BB%D0%B5%D0%BD%D1%82%D0%BD%D0%B0_%D0%B4%D0%BE%D0%B7%D0%B0&action=edit&redlink=1" class="new" title="Бананска еквивалентна доза (страницата не постои)">Бананска еквивалентна доза</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Наводи"><span id=".D0.9D.D0.B0.D0.B2.D0.BE.D0.B4.D0.B8"></span>Наводи</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&veaction=edit&section=4" title="Уреди го одделот „Наводи“" class="mw-editsection-visualeditor"><span>уреди</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&action=edit&section=4" title="Уреди изворен код на одделот: Наводи"><span>уреди извор</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist" style="list-style-type: decimal;"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text">The number of radioactive decays per second in a given mass of <sup>40</sup>K is the number of atoms in that mass, divided by the average lifetime of a <sup>40</sup>K atom in seconds. The number of atoms in one gram of <sup>40</sup>K is <a href="/w/index.php?title=Avogadro%27s_number&action=edit&redlink=1" class="new" title="Avogadro's number (страницата не постои)">Avogadro's number</a> 6.022<span style="margin:0 .15em 0 .25em">×</span>10<sup><span style="white-space:nowrap">23</span></sup> (the number of atoms per <a href="/w/index.php?title=Mole_(unit)&action=edit&redlink=1" class="new" title="Mole (unit) (страницата не постои)">mole</a>) divided by the <a href="/w/index.php?title=Atomic_weight&action=edit&redlink=1" class="new" title="Atomic weight (страницата не постои)">atomic weight</a> of potassium-40 (39.96 grams per mole), which is about 0.1507<span style="margin:0 .15em 0 .25em">×</span>10<sup><span style="white-space:nowrap">23</span></sup> per gram. As in any <a href="/w/index.php?title=Exponential_decay&action=edit&redlink=1" class="new" title="Exponential decay (страницата не постои)">exponential decay</a>, the average lifetime is the half-life divided by the <a href="/w/index.php?title=Natural_logarithm&action=edit&redlink=1" class="new" title="Natural logarithm (страницата не постои)">natural logarithm</a> of 2, or about 56.82<span style="margin:0 .15em 0 .25em">×</span>10<sup><span style="white-space:nowrap">15</span></sup> seconds.</span> </li> <li id="cite_note-Samat-2"><span class="mw-cite-backlink"><a href="#cite_ref-Samat_2-0">↑</a></span> <span class="reference-text"><cite id="CITEREFBin_SamatGreenBeddoe1997" class="citation journal">Bin Samat, Supian; Green, Stuart; Beddoe, Alun H. (1997). „The <sup>40</sup>K activity of one gram of potassium“. <i>Phys. Med. Biol</i>. <b>42</b> (2): 407. <a href="/wiki/Doi" class="mw-redirect" title="Doi">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1088%2F0031-9155%2F42%2F2%2F012">10.1088/0031-9155/42/2/012</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Phys.+Med.+Biol.&rft.atitle=The+%3Csup%3E40%3C%2Fsup%3EK+activity+of+one+gram+of+potassium&rft.volume=42&rft.issue=2&rft.pages=407&rft.date=1997&rft_id=info%3Adoi%2F10.1088%2F0031-9155%2F42%2F2%2F012&rft.aulast=Bin+Samat&rft.aufirst=Supian&rft.au=Green%2C+Stuart&rft.au=Beddoe%2C+Alun+H.&rfr_id=info%3Asid%2Fmk.wikipedia.org%3A%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40" class="Z3988"></span><style data-mw-deduplicate="TemplateStyles:r5289462">.mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background-image:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png");background-image:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg");background-repeat:no-repeat;background-size:9px;background-position:right .1em center}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background-image:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png");background-image:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg");background-repeat:no-repeat;background-size:9px;background-position:right .1em center}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background-image:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png");background-image:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg");background-repeat:no-repeat;background-size:9px;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:var(--color-subtle,#54595d)}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background-image:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png");background-image:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg");background-repeat:no-repeat;background-size:12px;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}</style></span> </li> </ol></div></div> <ul><li><a rel="nofollow" class="external text" href="http://nucleardata.nuclear.lu.se/toi/nuclide.asp?iZA=190040">Table of radioactive isotopes, K-40</a> <small><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140112140256/http://nucleardata.nuclear.lu.se/toi/nuclide.asp?iZA=190040">Архивирано</a> на 12 јануари 2014 г.</small>, <a rel="nofollow" class="external text" href="http://nucleardata.nuclear.lu.se/toi/">The Lund/LBNL Nuclear Data Search</a> <small><a rel="nofollow" class="external text" href="https://web.archive.org/web/20160307085115/http://nucleardata.nuclear.lu.se/toi/">Архивирано</a> на 7 март 2016 г.</small></li></ul> <div style="clear:both;"></div> <div class="mw-heading mw-heading2"><h2 id="Надворешни_врски"><span id=".D0.9D.D0.B0.D0.B4.D0.B2.D0.BE.D1.80.D0.B5.D1.88.D0.BD.D0.B8_.D0.B2.D1.80.D1.81.D0.BA.D0.B8"></span>Надворешни врски</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&veaction=edit&section=5" title="Уреди го одделот „Надворешни врски“" class="mw-editsection-visualeditor"><span>уреди</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-40&action=edit&section=5" title="Уреди изворен код на одделот: Надворешни врски"><span>уреди извор</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Potassium-40 Section, <a rel="nofollow" class="external text" href="https://www.remm.nlm.gov/ANL_ContaminantFactSheets_All_070418.pdf">Radiological and Chemical Fact Sheets to Support Health Risk Analyses for Contaminated Areas</a></li></ul> <p><br /> </p> <table class="wikitable" style="margin:0.5em auto; font-size:95%;clear:both;"> <tbody><tr style="text-align: center;"> <td width="35%">Полесен: <br /> <b><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-39&action=edit&redlink=1" class="new" title="Калиум-39 (страницата не постои)">калиум-39</a></b> </td> <td width="30%">Калиум-40 е <br /> <b><a href="/w/index.php?title=%D0%98%D0%B7%D0%BE%D1%82%D0%BE%D0%BF%D0%B8_%D0%BD%D0%B0_%D0%BA%D0%B0%D0%BB%D0%B8%D1%83%D0%BC&action=edit&redlink=1" class="new" title="Изотопи на калиум (страницата не постои)">изотоп</a> на <a href="/wiki/%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC" title="Калиум">калиумот</a></b> </td> <td width="35%">Потежок: <br /> <b><a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D0%B8%D1%83%D0%BC-41&action=edit&redlink=1" class="new" title="Калиум-41 (страницата не постои)">калиум-41</a></b> </td></tr> <tr style="text-align: center;"> <td width="35%"><a href="/wiki/%D0%A0%D0%B0%D1%81%D0%BF%D0%B0%D0%B4%D0%B5%D0%BD_%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%BE%D0%B4" title="Распаден производ">Распаден производ</a> на: <br /> <b>—</b> </td> <td width="30%"><b><a href="/w/index.php?title=%D0%A0%D0%B0%D1%81%D0%BF%D0%B0%D0%B4%D0%B5%D0%BD_%D0%BB%D0%B0%D0%BD%D0%B5%D1%86&action=edit&redlink=1" class="new" title="Распаден ланец (страницата не постои)">Распаден ланец</a></b> <br /> на калиум-40 </td> <td width="35%">Се <a href="/wiki/%D0%A0%D0%B0%D0%B4%D0%B8%D0%BE%D0%B0%D0%BA%D1%82%D0%B8%D0%B2%D0%BD%D0%BE%D1%81%D1%82" title="Радиоактивност">распаѓа</a> во: <br /> <b><a href="/w/index.php?title=%D0%90%D1%80%D0%B3%D0%BE%D0%BD-40&action=edit&redlink=1" class="new" title="Аргон-40 (страницата не постои)">аргон-40</a>, <a href="/w/index.php?title=%D0%9A%D0%B0%D0%BB%D1%86%D0%B8%D1%83%D0%BC-40&action=edit&redlink=1" class="new" title="Калциум-40 (страницата не постои)">калциум-40</a>, стабилен</b> </td></tr></tbody></table></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="">Преземено од „<a dir="ltr" href="https://mk.wikipedia.org/w/index.php?title=Калиум-40&oldid=4999639">https://mk.wikipedia.org/w/index.php?title=Калиум-40&oldid=4999639</a>“</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/%D0%A1%D0%BF%D0%B5%D1%86%D0%B8%D1%98%D0%B0%D0%BB%D0%BD%D0%B0:%D0%9A%D0%B0%D1%82%D0%B5%D0%B3%D0%BE%D1%80%D0%B8%D0%B8" title="Специјална:Категории">Категории</a>: <ul><li><a href="/wiki/%D0%9A%D0%B0%D1%82%D0%B5%D0%B3%D0%BE%D1%80%D0%B8%D1%98%D0%B0:%D0%98%D0%B7%D0%BE%D1%82%D0%BE%D0%BF%D0%B8_%D0%BD%D0%B0_%D0%BA%D0%B0%D0%BB%D0%B8%D1%83%D0%BC%D0%BE%D1%82" title="Категорија:Изотопи на калиумот">Изотопи на калиумот</a></li><li><a href="/w/index.php?title=%D0%9A%D0%B0%D1%82%D0%B5%D0%B3%D0%BE%D1%80%D0%B8%D1%98%D0%B0:%D0%A2%D0%BE%D0%BA%D1%81%D0%B8%D1%87%D0%BD%D0%BE%D1%81%D1%82_%D0%BD%D0%B0_%D1%85%D0%B5%D0%BC%D0%B8%D1%81%D0%BA%D0%B8%D1%82%D0%B5_%D0%B5%D0%BB%D0%B5%D0%BC%D0%B5%D0%BD%D1%82%D0%B8&action=edit&redlink=1" class="new" title="Категорија:Токсичност на хемиските елементи (страницата не постои)">Токсичност на хемиските елементи</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Скриена категорија: <ul><li><a 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