{"id":117040,"date":"2022-05-26T08:41:04","date_gmt":"2022-05-26T07:41:04","guid":{"rendered":"https:\/\/material-properties.org\/quest-ce-que-labsorption-photoelectrique-des-rayons-x-definition\/"},"modified":"2022-06-01T09:37:01","modified_gmt":"2022-06-01T08:37:01","slug":"quest-ce-que-labsorption-photoelectrique-des-rayons-x-definition","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/quest-ce-que-labsorption-photoelectrique-des-rayons-x-definition\/","title":{"rendered":"Qu&rsquo;est-ce que l&rsquo;absorption photo\u00e9lectrique des rayons X &#8211; D\u00e9finition"},"content":{"rendered":"<p><span><div class=\"su-quote su-quote-style-default\"><div class=\"su-quote-inner su-u-clearfix su-u-trim\">Dans l&rsquo;effet photo\u00e9lectrique, le rayon X subit une interaction avec un \u00e9lectron qui est li\u00e9 dans un atome. L&rsquo;absorption photo\u00e9lectrique domine aux basses \u00e9nergies des rayons X.\u00a0Propri\u00e9t\u00e9s des mat\u00e9riaux<\/div><\/div><\/span><\/p>\n<p><span><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h2><span>Absorption photo\u00e9lectrique des rayons X<\/span><\/h2>\n<figure id=\"attachment_11817\" aria-describedby=\"caption-attachment-11817\" style=\"width: 290px\" class=\"wp-caption alignright\"><a href=\"http:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/Photoelectric_effect_2.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"size-medium wp-image-11817\" src=\"http:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/Photoelectric_effect_2-300x170.jpg\" alt=\"Absorption gamma par un atome.  Source : laradioactivite.com\/\" width=\"300\" height=\"170\" \/><\/a><figcaption id=\"caption-attachment-11817\" class=\"wp-caption-text\"><span>Absorption gamma par un atome.<\/span><br \/><span>Source: laradioactivite.com\/<\/span><\/figcaption><\/figure>\n<p><span>Dans l&rsquo;effet photo\u00e9lectrique, un photon subit une interaction avec un \u00e9lectron qui est li\u00e9 dans un atome.\u00a0Dans cette interaction, le photon incident dispara\u00eet compl\u00e8tement et un photo\u00e9lectron \u00e9nerg\u00e9tique est \u00e9ject\u00e9 par l&rsquo;atome de l&rsquo;une\u00a0<\/span><strong><span>de ses couches li\u00e9es<\/span><\/strong><span>.\u00a0L&rsquo;\u00e9nergie cin\u00e9tique du photo\u00e9lectron \u00e9ject\u00e9 (E\u00a0<\/span><sub><span>e<\/span><\/sub><span>\u00a0) est \u00e9gale \u00e0 l&rsquo;\u00e9nergie du photon incident (h\u03bd) moins l&rsquo;\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/binding-energy\/\"><span>\u00e9nergie de liaison<\/span><\/a><span> du photo\u00e9lectron dans sa couche d&rsquo;origine (E<\/span><sub><span>b<\/span><\/sub><span>).<\/span><\/p>\n<p><strong><span>E\u00a0<\/span><\/strong><strong><sub><span>e<\/span><\/sub><\/strong><strong><span>\u00a0= h\u03bd-E\u00a0<\/span><\/strong><strong><sub><span>b<\/span><\/sub><\/strong><\/p>\n<p><span>Par cons\u00e9quent, les photo\u00e9lectrons ne sont \u00e9mis par effet photo\u00e9lectrique que si le photon atteint ou d\u00e9passe\u00a0<\/span><strong><span>une \u00e9nergie seuil<\/span><\/strong><span>\u00a0&#8211; l&rsquo;\u00e9nergie de liaison de l&rsquo;\u00e9lectron &#8211;\u00a0<\/span><strong><span>le travail<\/span><\/strong><span>\u00a0de sortie du mat\u00e9riau.\u00a0Pour les rayons X tr\u00e8s \u00e9lev\u00e9s avec des \u00e9nergies sup\u00e9rieures \u00e0 des centaines de keV, le photo\u00e9lectron emporte la majorit\u00e9 de l&rsquo;\u00e9nergie du photon incident &#8211; h\u03bd.<\/span><\/p>\n<p><strong><span>Aux faibles valeurs d&rsquo;\u00e9nergie des rayons gamma, l&rsquo;effet photo\u00e9lectrique domine<\/span><\/strong><span>.\u00a0Le m\u00e9canisme est \u00e9galement renforc\u00e9 pour les mat\u00e9riaux de num\u00e9ro atomique Z \u00e9lev\u00e9. Il n&rsquo;est pas simple de d\u00e9river une expression analytique de la probabilit\u00e9 d&rsquo;absorption photo\u00e9lectrique du rayon gamma par atome sur toutes les gammes d&rsquo;\u00e9nergies des rayons gamma.\u00a0La probabilit\u00e9 d&rsquo;absorption photo\u00e9lectrique par unit\u00e9 de masse est approximativement proportionnelle \u00e0\u00a0:<\/span><\/p>\n<p><strong><span>\u03c4\u00a0<\/span><\/strong><strong><sub><span>(photo\u00e9lectrique)<\/span><\/sub><\/strong><strong><span>\u00a0= constante x Z\u00a0<\/span><\/strong><strong><sup><span>N<\/span><\/sup><\/strong><strong><span>\u00a0\/E\u00a0<\/span><\/strong><strong><sup><span>3,5<\/span><\/sup><\/strong><\/p>\n<p><span>o\u00f9\u00a0<\/span><strong><span>Z<\/span><\/strong><span>\u00a0est le num\u00e9ro atomique, l&rsquo;exposant\u00a0<\/span><strong><span>n<\/span><\/strong><span>\u00a0varie entre 4 et 5.\u00a0<\/span><strong><span>E<\/span><\/strong><span>\u00a0est l&rsquo;\u00e9nergie du photon incident.\u00a0La proportionnalit\u00e9 aux puissances sup\u00e9rieures du num\u00e9ro atomique Z est la principale raison de l&rsquo;utilisation de mat\u00e9riaux \u00e0 Z \u00e9lev\u00e9, tels que le plomb ou l&rsquo;uranium appauvri dans les \u00e9crans gamma.<\/span><\/p>\n<p><a href=\"http:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/photoelectric_effect.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-medium wp-image-11683\" src=\"http:\/\/material-properties.org\/wp-content\/uploads\/2019\/05\/photoelectric_effect-300x214.png\" alt=\"Section transversale de l'effet photo\u00e9lectrique.\" width=\"300\" height=\"214\" \/><\/a><span>Bien que la probabilit\u00e9 de l&rsquo;absorption photo\u00e9lectrique du photon diminue, en g\u00e9n\u00e9ral, avec l&rsquo;augmentation de l&rsquo;\u00e9nergie du photon, il existe\u00a0<\/span><strong><span>de fortes discontinuit\u00e9s<\/span><\/strong><span>\u00a0dans la courbe de section.\u00a0Celles-ci sont appel\u00e9es\u00a0<\/span><strong><span>\u00ab\u00a0ar\u00eates d&rsquo;absoption\u00a0\u00bb <\/span><\/strong><span>et ils correspondent aux \u00e9nergies de liaison des \u00e9lectrons des coquilles li\u00e9es de l&rsquo;atome.\u00a0Pour les photons avec l&rsquo;\u00e9nergie juste au-dessus du bord, l&rsquo;\u00e9nergie du photon est juste suffisante pour subir l&rsquo;interaction photo\u00e9lectrique avec l&rsquo;\u00e9lectron de la coque li\u00e9e, disons K-shell.\u00a0La probabilit\u00e9 d&rsquo;une telle interaction est juste au-dessus de ce bord bien sup\u00e9rieure \u00e0 celle des photons d&rsquo;\u00e9nergie l\u00e9g\u00e8rement en dessous de ce bord.\u00a0Pour les photons en dessous de ce bord, l&rsquo;interaction avec l&rsquo;\u00e9lectron de la couche K est \u00e9nerg\u00e9tiquement impossible et, par cons\u00e9quent, la probabilit\u00e9 chute brusquement.\u00a0Ces bords se produisent \u00e9galement aux \u00e9nergies de liaison des \u00e9lectrons d&rsquo;autres couches (L, M, N \u2026..).<\/span><\/p>\n<h2><span>Interaction des rayons X avec la mati\u00e8re<\/span><\/h2>\n<p><span>Bien qu&rsquo;un grand nombre d&rsquo;interactions possibles soient connues, il existe trois principaux m\u00e9canismes d&rsquo;interaction avec la mati\u00e8re.\u00a0La force de ces interactions d\u00e9pend de l&rsquo;\u00a0<\/span><strong><span>\u00e9nergie des rayons X<\/span><\/strong><span>\u00a0et de la composition \u00e9l\u00e9mentaire du mat\u00e9riau, mais pas beaucoup des propri\u00e9t\u00e9s chimiques, car l&rsquo;\u00e9nergie des photons des rayons X est beaucoup plus \u00e9lev\u00e9e que les \u00e9nergies de liaison chimique.\u00a0L&rsquo;absorption photo\u00e9lectrique domine\u00a0<\/span><strong><span>aux basses \u00e9nergies des rayons X,<\/span><\/strong><span>\u00a0tandis que la diffusion Compton domine aux \u00e9nergies plus \u00e9lev\u00e9es.<\/span><\/p>\n<ul>\n<li><strong><span>Absorption photo\u00e9lectrique<\/span><\/strong><\/li>\n<li><strong><span>Diffusion Compton<\/span><\/strong><\/li>\n<li><strong><span>Diffusion Rayleigh<\/span><\/strong><\/li>\n<\/ul>\n<p><span><\/span><\/p><\/div><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"R\u00e9f\u00e9rences\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>R\u00e9f\u00e9rences :<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<p><strong><span>Protection contre les radiations:<\/span><\/strong><\/p>\n<ol>\n<li><span>Knoll, Glenn F., Radiation Detection and Measurement 4th Edition, Wiley, 8\/2010.\u00a0ISBN-13\u00a0: 978-0470131480.<\/span><\/li>\n<li><span>Stabin, Michael G., Radioprotection et dosim\u00e9trie : une introduction \u00e0 la physique de la sant\u00e9, Springer, 10\/2010.\u00a0ISBN-13\u00a0: 978-1441923912.<\/span><\/li>\n<li><span>Martin, James E., Physics for Radiation Protection 3rd Edition, Wiley-VCH, 4\/2013.\u00a0ISBN-13\u00a0: 978-3527411764.<\/span><\/li>\n<li><span>USNRC, CONCEPTS DE R\u00c9ACTEURS NUCL\u00c9AIRES<\/span><\/li>\n<li><span>D\u00e9partement am\u00e9ricain de l&rsquo;\u00e9nergie, de la physique nucl\u00e9aire et de la th\u00e9orie des r\u00e9acteurs.\u00a0DOE Fundamentals Handbook, Volume 1 et 2. Janvier 1993.<\/span><\/li>\n<\/ol>\n<p><strong><span>Physique nucl\u00e9aire et des r\u00e9acteurs:<\/span><\/strong><\/p>\n<ol>\n<li><span>JR Lamarsh, Introduction \u00e0 la th\u00e9orie des r\u00e9acteurs nucl\u00e9aires, 2e \u00e9d., Addison-Wesley, Reading, MA (1983).<\/span><\/li>\n<li><span>JR Lamarsh, AJ Baratta, Introduction au g\u00e9nie nucl\u00e9aire, 3e \u00e9d., Prentice-Hall, 2001, ISBN : 0-201-82498-1.<\/span><\/li>\n<li><span>WM Stacey, Physique des r\u00e9acteurs nucl\u00e9aires, John Wiley &amp; Sons, 2001, ISBN : 0-471-39127-1.<\/span><\/li>\n<li><span>Glasstone, Sesonsk\u00e9.\u00a0Ing\u00e9nierie des r\u00e9acteurs nucl\u00e9aires\u00a0: Ing\u00e9nierie des syst\u00e8mes de r\u00e9acteurs, Springer\u00a0;\u00a04e \u00e9dition, 1994, ISBN : 978-0412985317<\/span><\/li>\n<li><span>WSC Williams.\u00a0Physique nucl\u00e9aire et des particules.\u00a0Presse Clarendon\u00a0;\u00a01 \u00e9dition, 1991, ISBN : 978-0198520467<\/span><\/li>\n<li><span>GRKeep.\u00a0Physique de la cin\u00e9tique nucl\u00e9aire.\u00a0Pub Addison-Wesley.\u00a0Co;\u00a01\u00e8re \u00e9dition, 1965<\/span><\/li>\n<li><span>Robert Reed Burn, Introduction au fonctionnement des r\u00e9acteurs nucl\u00e9aires, 1988.<\/span><\/li>\n<li><span>D\u00e9partement am\u00e9ricain de l&rsquo;\u00e9nergie, de la physique nucl\u00e9aire et de la th\u00e9orie des r\u00e9acteurs.\u00a0DOE Fundamentals Handbook, Volume 1 et 2. Janvier 1993.<\/span><\/li>\n<li><span>Paul Reuss, Physique des neutrons.\u00a0EDP \u200b\u200bSciences, 2008. ISBN : 978-2759800414.<\/span><\/li>\n<\/ol>\n<p><span><\/span><\/p><\/div><\/div><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/div><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><\/div><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h2><span>Voir \u00e9galement:<\/span><\/h2>\n<p><span>Rayons X<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/x-rays-roentgen-radiation\/\" class=\"su-button su-button-style-flat\" style=\"color:#606060;background-color:#ffffff;border-color:#cccccc;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px\" target=\"_self\"><span style=\"color:#606060;padding:7px 20px;font-size:16px;line-height:24px;border-color:#ffffff;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;text-shadow:0px 0px 0px #000000;-moz-text-shadow:0px 0px 0px #000000;-webkit-text-shadow:0px 0px 0px #000000\"><img src=\"icon : lien\" alt=\"\" style=\"width:24px;height:24px\" \/> <\/span><\/a>[ \/lgc_column]<div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><\/div><\/div><\/span><\/p><\/div><\/div><\/span><\/p>\n<p><span><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span>Nous esp\u00e9rons que cet article,\u00a0<\/span><strong><span>Absorption photo\u00e9lectrique des rayons X<\/span><\/strong><span>, vous aidera.\u00a0Si oui,\u00a0<\/span><strong><span>donnez-nous un like<\/span><\/strong><span>\u00a0dans la barre lat\u00e9rale.\u00a0L&rsquo;objectif principal de ce site Web est d&rsquo;aider le public \u00e0 apprendre des informations int\u00e9ressantes et importantes sur les mat\u00e9riaux et leurs propri\u00e9t\u00e9s.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nous esp\u00e9rons que cet article,\u00a0Absorption photo\u00e9lectrique des rayons X, vous aidera.\u00a0Si oui,\u00a0donnez-nous un like\u00a0dans la barre lat\u00e9rale.\u00a0L&rsquo;objectif principal de ce site Web est d&rsquo;aider le public \u00e0 apprendre des informations int\u00e9ressantes et importantes sur les mat\u00e9riaux et leurs propri\u00e9t\u00e9s.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que l&#039;absorption photo\u00e9lectrique des rayons X - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Dans l&#039;effet photo\u00e9lectrique, le rayon X subit une interaction avec un \u00e9lectron qui est li\u00e9 dans un atome. 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