{"id":18252,"date":"2020-06-27T15:15:16","date_gmt":"2020-06-27T15:15:16","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-efeito-fotoeletrico-definicao\/"},"modified":"2020-07-24T10:38:44","modified_gmt":"2020-07-24T10:38:44","slug":"o-que-e-efeito-fotoeletrico-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-efeito-fotoeletrico-definicao\/","title":{"rendered":"O que \u00e9 Efeito Fotoel\u00e9trico &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-u-clearfix su-u-trim\">No efeito fotoel\u00e9trico, um f\u00f3ton sofre uma intera\u00e7\u00e3o com um el\u00e9tron que est\u00e1 ligado em um \u00e1tomo. O efeito fotoel\u00e9trico domina com baixas energias dos raios gama. Dosimetria de Radia\u00e7\u00e3o<\/div>\n<\/div>\n<div><\/div>\n<div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<h2><span>Efeito fotoel\u00e9trico<\/span><\/h2>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-accordion su-u-trim\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\">\n<div class=\"su-spoiler-content su-u-clearfix su-u-trim\">\n<figure id=\"attachment_11826\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-11826\"><figcaption id=\"caption-attachment-11826\" class=\"wp-caption-text\"><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<ul>\n<li><span>O efeito fotoel\u00e9trico domina\u00a0<\/span><strong><span>com baixas energias dos raios gama<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>O efeito fotoel\u00e9trico leva \u00e0\u00a0<\/span><strong><span>emiss\u00e3o de fotoel\u00e9trons<\/span><\/strong><span>\u00a0da mat\u00e9ria quando a luz (\u00a0<\/span><a title=\"F\u00f3ton - Part\u00edcula Fundamental\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/\"><span>f\u00f3tons<\/span><\/a><span>\u00a0) brilha sobre eles.<\/span><\/li>\n<li><span>A energia m\u00e1xima que um el\u00e9tron pode receber em qualquer intera\u00e7\u00e3o \u00e9\u00a0<\/span><strong><i><span>h\u03bd<\/span><\/i><span>\u00a0.<\/span><\/strong><\/li>\n<li><span>Os el\u00e9trons s\u00e3o emitidos apenas pelo efeito fotoel\u00e9trico se o f\u00f3ton atingir ou exceder\u00a0<\/span><strong><span>um limiar de energia<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>Um el\u00e9tron livre (por exemplo, da nuvem at\u00f4mica) n\u00e3o pode absorver toda a energia do f\u00f3ton incidente.\u00a0Isso \u00e9 resultado da necessidade de economizar impulso e energia.<\/span><\/li>\n<li><span>A se\u00e7\u00e3o transversal para a emiss\u00e3o de n = 1 fotoel\u00e9trons (casca K) \u00e9 maior que a dos n = 2 fotoel\u00e9trons (casca L).\u00a0Isso \u00e9 resultado da necessidade de economizar impulso e energia.<\/span><\/li>\n<\/ul>\n<div class=\"su-spacer\"><\/div>\n<h2><span>Defini\u00e7\u00e3o de efeito fotoel\u00e9trico<\/span><\/h2>\n<p><span>No efeito fotoel\u00e9trico, um f\u00f3ton sofre uma intera\u00e7\u00e3o com um el\u00e9tron que est\u00e1 ligado em um \u00e1tomo.\u00a0Nesta intera\u00e7\u00e3o, o f\u00f3ton incidente desaparece completamente e um fotoel\u00e9tron energ\u00e9tico \u00e9 ejetado pelo \u00e1tomo de uma\u00a0<\/span><strong><span>de suas conchas ligadas<\/span><\/strong><span>\u00a0.\u00a0A energia cin\u00e9tica do fotoel\u00e9tron ejetado (E\u00a0<\/span><sub><span>e<\/span><\/sub><span>\u00a0) \u00e9 igual \u00e0 energia incidente do f\u00f3ton (h\u03bd) menos a\u00a0<\/span><a title=\"Energia de liga\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/binding-energy\/\"><span>energia<\/span><\/a><span>\u00a0de\u00a0<a title=\"Energia de liga\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/binding-energy\/\">liga\u00e7\u00e3o<\/a>\u00a0do fotoel\u00e9tron em seu inv\u00f3lucro original (E\u00a0<\/span><sub><span>b<\/span><\/sub><span>\u00a0).<\/span><\/p>\n<p><strong><span>E\u00a0<\/span><sub><span>e<\/span><\/sub><span>\u00a0= h\u03bd-E\u00a0<\/span><sub><span>b<\/span><\/sub><\/strong><\/p>\n<p><span>Portanto, os fotoel\u00e9trons s\u00e3o emitidos apenas pelo efeito fotoel\u00e9trico se o f\u00f3ton atingir ou exceder\u00a0<\/span><strong><span>um limiar de energia<\/span><\/strong><span>\u00a0&#8211; a energia de liga\u00e7\u00e3o do el\u00e9tron &#8211;\u00a0<\/span><strong><span>a fun\u00e7\u00e3o<\/span><\/strong><span>\u00a0de\u00a0<strong>trabalho<\/strong>\u00a0do material.\u00a0Para raios gama com energias superiores a centenas de keV, o fotoel\u00e9tron retira a maior parte da energia incidente do f\u00f3ton &#8211; h\u03bd. Ap\u00f3s uma intera\u00e7\u00e3o fotoel\u00e9trica, um \u00e1tomo absorvedor ionizado \u00e9 criado com\u00a0<\/span><strong><span>uma vaga em uma de suas conchas ligadas<\/span><\/strong><span>.\u00a0Essa vaga ser\u00e1 rapidamente preenchida por um el\u00e9tron de uma concha com uma energia de liga\u00e7\u00e3o mais baixa (outras conchas) ou pela captura de um el\u00e9tron livre do material.\u00a0O rearranjo de el\u00e9trons de outras camadas cria outra vaga que, por sua vez, \u00e9 preenchida por um el\u00e9tron de uma camada de energia de liga\u00e7\u00e3o ainda mais baixa.\u00a0Portanto, uma cascata de\u00a0<\/span><strong><span>raios-X<\/span><\/strong><span>\u00a0mais\u00a0<strong>caracter\u00edsticos<\/strong>\u00a0tamb\u00e9m pode ser gerada.\u00a0A probabilidade de emiss\u00e3o caracter\u00edstica de raios-X diminui \u00e0 medida que o n\u00famero at\u00f4mico do absorvedor diminui.\u00a0\u00c0s vezes, a emiss\u00e3o de um el\u00e9tron Auger ocorre.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\">\n<figure id=\"attachment_11855\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-11855\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Photoelectric-Effect-Potassium.jpg\"><img loading=\"lazy\" class=\"size-medium wp-image-11855 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Photoelectric-Effect-Potassium-300x169.jpg\" alt=\"Efeito fotoel\u00e9trico com f\u00f3tons do espectro vis\u00edvel na placa de pot\u00e1ssio - limiar de energia - 2eV\" width=\"300\" height=\"169\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Photoelectric-Effect-Potassium-300x169.jpg\" \/><\/a><figcaption id=\"caption-attachment-11855\" class=\"wp-caption-text\"><span>Efeito fotoel\u00e9trico com f\u00f3tons do espectro vis\u00edvel na placa de pot\u00e1ssio &#8211; limiar de energia &#8211; 2eV<\/span><\/figcaption><\/figure>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<figure id=\"attachment_11817\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-11817\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Photoelectric_effect_2.jpg\"><img loading=\"lazy\" class=\"size-medium wp-image-11819 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Photoelectric_effect_2-300x170.jpg\" alt=\"Absor\u00e7\u00e3o gama por um \u00e1tomo.  Fonte: laradioactivite.com\/\" width=\"300\" height=\"170\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Photoelectric_effect_2-300x170.jpg\" \/><\/a><figcaption id=\"caption-attachment-11817\" class=\"wp-caption-text\"><span>Absor\u00e7\u00e3o gama por um \u00e1tomo.<\/span><br \/>\n<span>Fonte: laradioactivite.com\/<\/span><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Se\u00e7\u00f5es Cruzadas de Efeito Fotoel\u00e9trico<\/span><\/h2>\n<p><strong><span>Em pequenos valores de energia de raios gama, o efeito fotoel\u00e9trico domina<\/span><\/strong><span>\u00a0.\u00a0O mecanismo tamb\u00e9m \u00e9 aprimorado para materiais de alto n\u00famero at\u00f4mico Z. N\u00e3o \u00e9 simples derivar express\u00e3o anal\u00edtica para a probabilidade de absor\u00e7\u00e3o fotoel\u00e9trica de raios gama por \u00e1tomo em todas as faixas de energias de raios gama.\u00a0A probabilidade de absor\u00e7\u00e3o fotoel\u00e9trica por unidade de massa \u00e9 aproximadamente proporcional a:<\/span><\/p>\n<p><strong><span>\u03c4\u00a0<\/span><sub><span>(fotoel\u00e9trico)<\/span><\/sub><span>\u00a0= constante x Z\u00a0<\/span><sup><span>N<\/span><\/sup><span>\u00a0\/ E\u00a0<\/span><sup><span>3.5<\/span><\/sup><\/strong><\/p>\n<p><span>onde\u00a0<\/span><strong><span>Z<\/span><\/strong><span>\u00a0\u00e9 o n\u00famero at\u00f4mico, o expoente\u00a0<\/span><strong><span>n<\/span><\/strong><span>\u00a0varia entre 4 e 5.\u00a0<\/span><strong><span>E<\/span><\/strong><span>\u00a0\u00e9 a energia do f\u00f3ton incidente.\u00a0A proporcionalidade \u00e0s pot\u00eancias mais altas do n\u00famero at\u00f4mico Z \u00e9 a principal raz\u00e3o para o uso de materiais com alto teor de Z, como chumbo ou ur\u00e2nio empobrecido em blindagens de raios gama. energia, existem\u00a0<\/span><strong><span>fortes descontinuidades<\/span><\/strong><span>\u00a0na curva da se\u00e7\u00e3o transversal.\u00a0Estes s\u00e3o chamados de\u00a0<\/span><strong><span>&#8220;bordas de absoption&#8221;<\/span><\/strong><span>e eles correspondem \u00e0s energias de liga\u00e7\u00e3o dos el\u00e9trons das conchas atadas dos \u00e1tomos.\u00a0Para f\u00f3tons com a energia logo acima da borda, a energia do f\u00f3ton \u00e9 apenas suficiente para sofrer a intera\u00e7\u00e3o fotoel\u00e9trica com o el\u00e9tron da casca ligada, digamos K-shell.\u00a0A probabilidade de tal intera\u00e7\u00e3o est\u00e1 logo acima dessa borda muito maior do que a de f\u00f3tons de energia ligeiramente abaixo dessa borda.\u00a0Para os f\u00f3tons gama abaixo desse limite, a intera\u00e7\u00e3o com o el\u00e9tron da casca K \u00e9 energeticamente imposs\u00edvel e, portanto, a probabilidade cai abruptamente.\u00a0Essas arestas ocorrem tamb\u00e9m em energias de liga\u00e7\u00e3o de el\u00e9trons de outras camadas (L, M, N &#8230; ..).<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/photoelectric_effect.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-11683 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/photoelectric_effect-300x214.png\" alt=\"Se\u00e7\u00e3o transversal de efeito fotoel\u00e9trico.\" width=\"300\" height=\"214\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/photoelectric_effect-300x214.png\" \/><\/a><span>Se\u00e7\u00e3o transversal de efeito fotoel\u00e9trico.<\/span><\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<h2><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>No efeito fotoel\u00e9trico, um f\u00f3ton sofre uma intera\u00e7\u00e3o com um el\u00e9tron que est\u00e1 ligado em um \u00e1tomo. O efeito fotoel\u00e9trico domina com baixas energias dos raios gama. Dosimetria de Radia\u00e7\u00e3o Efeito fotoel\u00e9trico O efeito fotoel\u00e9trico domina\u00a0com baixas energias dos raios gama\u00a0. O efeito fotoel\u00e9trico leva \u00e0\u00a0emiss\u00e3o de fotoel\u00e9trons\u00a0da mat\u00e9ria quando a luz (\u00a0f\u00f3tons\u00a0) brilha sobre &#8230; <a title=\"O que \u00e9 Efeito Fotoel\u00e9trico &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-efeito-fotoeletrico-definicao\/\" aria-label=\"More on O que \u00e9 Efeito Fotoel\u00e9trico &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[51],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 Efeito Fotoel\u00e9trico - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"No efeito fotoel\u00e9trico, um f\u00f3ton sofre uma intera\u00e7\u00e3o com um el\u00e9tron que est\u00e1 ligado em um \u00e1tomo. 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