Médiathèque - La radioactivité

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href='/multimedia/Pages/PAGES-SPECIALES/Recherche-locale.aspx?k=Radioactivité'>Radioactivité</a></p> <h1> <span class="book">Publication</span>La radioactivité </h1> </div> <div id="bando-infos" class="clearfix"> <em class="published"> <div id="ctl00_PlaceHolderMain_DisplayModePanel_top_PublicationNameAndNumber"><strong class='title'>Livret thématique N<sup>o</sup> 2 </strong>– <span class='date'>Parution : décembre 2018</span></div> </em> <div class="navtools right menu-horizontal"> <ul> <li class="nv-item imprimer"> <a href="javascript:window.print()" rel="nofollow" title="Imprimer"> <img src="/_layouts/15/I2I/web/img/share/print.png" alt="Imprimer" width="18" height="16"> </a> </li> <li class="nv-item addBookmark"> <a href="javascript:void(0)" rel="nofollow" title="Ajouter aux favoris" onclick="triggerBookmark(this)"> <img src="/_layouts/15/I2I/web/img/share/favori.png" alt="Ajouter aux favoris" width="18" height="16"> </a> </li> <li class="nv-item send"> <a id="sendMailLink" 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'Command/Cmd' : 'CTRL') + ' + D sur votre clavier.'); } // If you have something in the `href` of your trigger return false; }; </script> </div> <div id="ctl00_PlaceHolderMain_DisplayModePanel_top_BodyText_label" style='display:none'>Sommaire</div><div id="ctl00_PlaceHolderMain_DisplayModePanel_top_BodyText__ControlWrapper_RichHtmlField" class="ms-rtestate-field" style="display:inline" aria-labelledby="ctl00_PlaceHolderMain_DisplayModePanel_top_BodyText_label"><blockquote class="ms-rteElement-cea-quotes">La radioactivité n’a pas été inventée par l’homme. C’est un phénomène naturel qui a été découvert à la fin du XIXe siècle. </blockquote><p>Il y a un peu plus d'un siècle, en 1896, le physicien français Henri Becquerel cherchait à savoir si des sels d'uranium, excités par la lumière du Soleil, émettaient des rayons X en même temps qu'ils étaient fluorescents (les rayons X venaient tout juste d'être découverts par Wilhelm Roentgen, physicien allemand). Quelle ne fut pas sa surprise lorsqu'il découvrit que, excités ou non, les sels d'uranium émettaient des rayonnements capables de traverser une bonne épaisseur de matériau puis d'impressionner une plaque photographique ! Il en conclut que l'uranium émettait spontanément et sans s'épuiser des rayonnements invisibles se comportant comme les rayons X. Ce phénomène naturel fut appelé radioactivité (du latin radius : rayon) quelques années plus tard par Marie Curie. En 1898, à la suite des travaux d'Henri Becquerel, Pierre et Marie Curie découvrirent le polonium et le radium, deux éléments radioactifs (radioéléments) inconnus, présents dans le minerai d'uranium. Pour ces travaux, ces trois scientifiques ont partagé le prix Nobel de physique en 1903. À leur suite, Irène Curie et son époux Frédéric Joliot ont découvert la radioactivité artificielle, ce qui leur a valu le prix Nobel de chimie en 1935. <br></p><p> <br> </p><h2>Dans ce livret thématique, découvrez :</h2><p> <br> </p><ul><li><h4>Qu'est-ce que la radioactivité ?<br></h4></li><li><h4>Les origines des radionucléides<br></h4></li><li><h4>Les applications de la radioactivité</h4></li></ul><p><br></p></div> <p id="ctl00_PlaceHolderMain_DisplayModePanel_top_GoTop1_GoTopParagraph" class="gotop"><a href='#top' title='Remonter en haut de la page'>Haut de page</a></p>  <p id="ctl00_PlaceHolderMain_DisplayModePanel_top_ctl00_GoTopParagraph" class="gotop"></p> <span id="ctl00_PlaceHolderMain_DisplayModePanel_top_NavTagsUserControl"></span><div class="block" id="navtags"><h2>Mots clés : <a href='/multimedia/Pages/PAGES-SPECIALES/Recherche-locale.aspx?k=radio-isotope'>radio-isotope</a> | <a 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To keep this Web Part, click Cancel.'; ExecuteOrDelayUntilScriptLoaded( function() { var initInfo = { itemPermMasks: {High:0,Low:2147688481}, listPermMasks: {High:0,Low:2147688481}, listId: "4c3b8c8d-b079-4cae-bab3-67802757263e", itemId: 804, workflowsAssociated: false, editable: false, doNotShowProperties: false, enableVersioning: true }; SP.Ribbon.DocLibAspxPageComponent.registerWithPageManager(initInfo); }, "sp.ribbon.js"); var g_disableCheckoutInEditMode = false; var _spWebPermMasks = {High:0,Low:2147688481};var slNavUrl = '\u002fmultimedia';_spBodyOnLoadFunctionNames.push('_cUpdonetidProjectPropertyTitleGraphic');function _cUpdonetidProjectPropertyTitleGraphic(){var myd = null; if (typeof(dataonetidProjectPropertyTitleGraphic) != 'undefined') {myd = dataonetidProjectPropertyTitleGraphic;} var myc = document.getElementById('ctl00_onetidProjectPropertyTitleGraphic');_cUpdconetidProjectPropertyTitleGraphic(myd, myc);}function _cUpdconetidProjectPropertyTitleGraphic(data, ctrl){ctrl.href = slNavUrl;}function _cUpdonetidHeadbnnr2(){var myd = null; if (typeof(dataonetidHeadbnnr2) != 'undefined') {myd = dataonetidHeadbnnr2;} var myc = document.getElementById('ctl00_onetidHeadbnnr2');_cUpdconetidHeadbnnr2(myd, myc);}function _cUpdconetidHeadbnnr2(data, ctrl){SiteLogoImagePageUpdate(ctrl, data);}WPSC.Init(document); var varPartWPQ1 = WPSC.WebPartPage.Parts.Register('WPQ1','ef3bfa9b-046e-49c7-a1ec-e492f92da194',document.getElementById('WebPartWPQ1')); WPSC.WebPartPage.WebURL = 'https:\u002f\u002fwww.cea.fr\u002fmultimedia'; WPSC.WebPartPage.WebServerRelativeURL = '\u002fmultimedia'; theForm.oldSubmit = theForm.submit; theForm.submit = WebForm_SaveScrollPositionSubmit; theForm.oldOnSubmit = theForm.onsubmit; theForm.onsubmit = WebForm_SaveScrollPositionOnSubmit; //]]> </script> </form> </div> </body> </html>

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