{"id":17369,"date":"2020-06-12T07:53:09","date_gmt":"2020-06-12T07:53:09","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/qual-e-a-natureza-da-interacao-da-radiacao-beta-com-a-materia-definicao\/"},"modified":"2020-07-20T06:25:21","modified_gmt":"2020-07-20T06:25:21","slug":"qual-e-a-natureza-da-interacao-da-radiacao-beta-com-a-materia-definicao","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/pt-br\/qual-e-a-natureza-da-interacao-da-radiacao-beta-com-a-materia-definicao\/","title":{"rendered":"Qual \u00e9 a natureza da intera\u00e7\u00e3o da radia\u00e7\u00e3o beta com a mat\u00e9ria &#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\">A natureza de uma intera\u00e7\u00e3o de uma radia\u00e7\u00e3o beta com a mat\u00e9ria \u00e9 diferente da radia\u00e7\u00e3o alfa, apesar do fato de que as part\u00edculas beta tamb\u00e9m s\u00e3o part\u00edculas carregadas.\u00a0Dosimetria de Radia\u00e7\u00e3o<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/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>Natureza da intera\u00e7\u00e3o da radia\u00e7\u00e3o beta com a mat\u00e9ria<\/h2>\n<p><strong>Resumo dos tipos de intera\u00e7\u00f5es:<\/strong><\/p>\n<ul>\n<li><strong>Colis\u00f5es inel\u00e1sticas com el\u00e9trons at\u00f4micos (excita\u00e7\u00e3o e ioniza\u00e7\u00e3o)<\/strong><\/li>\n<li><strong>Espalhamento el\u00e1stico dos n\u00facleos<\/strong><\/li>\n<li><strong>Bremsstrahlung.<\/strong><\/li>\n<li><strong>Radia\u00e7\u00e3o Cherenkov.<\/strong><\/li>\n<li><strong>Aniquila\u00e7\u00e3o (apenas p\u00f3sitrons)<\/strong><\/li>\n<\/ul>\n<figure id=\"attachment_11707\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-11707\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/cloud-chamber-2.png\"><img loading=\"lazy\" class=\"size-medium wp-image-11707 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/cloud-chamber-2-300x167.png\" alt=\"Compara\u00e7\u00e3o de part\u00edculas em uma c\u00e2mara de nuvens.\" width=\"300\" height=\"167\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/cloud-chamber-2-300x167.png\" \/><\/a><figcaption id=\"caption-attachment-11707\" class=\"wp-caption-text\">Compara\u00e7\u00e3o de part\u00edculas em uma c\u00e2mara de nuvens.\u00a0Fonte: wikipedia.org<\/figcaption><\/figure>\n<p><strong>A natureza de uma intera\u00e7\u00e3o de uma radia\u00e7\u00e3o beta<\/strong>\u00a0com a mat\u00e9ria \u00e9 diferente da\u00a0<a title=\"Alpha Particle\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\">radia\u00e7\u00e3o alfa<\/a>\u00a0, apesar do fato de que as part\u00edculas beta tamb\u00e9m s\u00e3o part\u00edculas carregadas.\u00a0Em compara\u00e7\u00e3o com part\u00edculas alfa, as part\u00edculas beta t\u00eam\u00a0<strong>massa muito mais baixa<\/strong>\u00a0e atingem\u00a0<strong>principalmente energias relativ\u00edsticas<\/strong>\u00a0.\u00a0Sua massa \u00e9 igual \u00e0 massa dos el\u00e9trons orbitais com os quais eles est\u00e3o interagindo e, diferentemente da part\u00edcula alfa, uma fra\u00e7\u00e3o muito maior de sua energia cin\u00e9tica pode ser perdida em uma \u00fanica intera\u00e7\u00e3o.\u00a0Como as part\u00edculas beta atingem principalmente as energias relativ\u00edsticas, a\u00a0<a title=\"Poder de parada - Bethe Formula\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-heavy-charged-particles\/stopping-power-bethe-formula\/\">f\u00f3rmula<\/a>\u00a0n\u00e3o-\u00a0relativ\u00edstica de\u00a0<a title=\"Poder de parada - Bethe Formula\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-heavy-charged-particles\/stopping-power-bethe-formula\/\">Bethe<\/a>\u00a0n\u00e3o pode ser usada.\u00a0<strong>Para el\u00e9trons de alta energia,<\/strong>\u00a0uma express\u00e3o semelhante tamb\u00e9m foi derivada por\u00a0<strong>Bethe<\/strong>descrever a perda de energia espec\u00edfica devido \u00e0\u00a0<strong>excita\u00e7\u00e3o e ioniza\u00e7\u00e3o<\/strong>\u00a0(as &#8220;perdas colisionais&#8221;).<\/p>\n<figure id=\"attachment_11703\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-11703\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Bethe_formula_electrons.png\"><img loading=\"lazy\" class=\"wp-image-11703 size-large lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Bethe_formula_electrons-1024x299.png\" alt=\"F\u00f3rmula Bethe modificada para part\u00edculas beta.\" width=\"669\" height=\"195\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Bethe_formula_electrons-1024x299.png\" \/><\/a><figcaption id=\"caption-attachment-11703\" class=\"wp-caption-text\">F\u00f3rmula Bethe modificada para part\u00edculas beta.<\/figcaption><\/figure>\n<p>Al\u00e9m disso, as part\u00edculas beta podem interagir via intera\u00e7\u00e3o\u00a0<strong>el\u00e9tron-nuclear<\/strong>\u00a0(dispers\u00e3o el\u00e1stica dos n\u00facleos), o que pode alterar significativamente a\u00a0<strong>dire\u00e7\u00e3o da part\u00edcula beta<\/strong>\u00a0.\u00a0Portanto, o caminho deles n\u00e3o \u00e9 t\u00e3o direto.\u00a0As part\u00edculas beta seguem um\u00a0<strong>caminho<\/strong>\u00a0muito em\u00a0<strong>zigue-zague<\/strong>\u00a0atrav\u00e9s do material absorvente; esse caminho resultante da part\u00edcula \u00e9 maior que a penetra\u00e7\u00e3o linear (faixa) no material.<\/p>\n<p>As part\u00edculas beta tamb\u00e9m diferem de outras part\u00edculas carregadas pesadas na fra\u00e7\u00e3o de energia perdida pelo processo radiativo conhecido como\u00a0<strong>bremsstrahlung<\/strong>\u00a0.\u00a0Da teoria cl\u00e1ssica, quando uma part\u00edcula carregada \u00e9 acelerada ou desacelerada,\u00a0<strong>ela deve irradiar energia<\/strong>\u00a0e a radia\u00e7\u00e3o de desacelera\u00e7\u00e3o \u00e9 conhecida como\u00a0<strong>bremsstrahlung (&#8220;radia\u00e7\u00e3o de frenagem&#8221;)<\/strong>\u00a0.<\/p>\n<p>Existe outro mecanismo pelo qual as part\u00edculas beta perdem energia atrav\u00e9s da produ\u00e7\u00e3o de radia\u00e7\u00e3o eletromagn\u00e9tica.\u00a0Quando a part\u00edcula beta se move mais r\u00e1pido que a velocidade da luz (velocidade de fase) no material, gera uma onda de choque de radia\u00e7\u00e3o eletromagn\u00e9tica conhecida como\u00a0<strong>radia\u00e7\u00e3o de Cherenkov<\/strong>\u00a0.<\/p>\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=\"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<p><strong><span>Os p\u00f3sitrons<\/span><\/strong><span>\u00a0interagem de maneira semelhante com a mat\u00e9ria\u00a0<\/span><strong><span>quando s\u00e3o energ\u00e9ticos<\/span><\/strong><span>\u00a0.\u00a0Mas quando o p\u00f3sitron\u00a0<\/span><strong><span>vem para descansar<\/span><\/strong><span>\u00a0, ele interage com um el\u00e9tron de carga negativa, resultando\u00a0<\/span><strong><span>na aniquila\u00e7\u00e3o<\/span><\/strong><span>\u00a0do par el\u00e9tron-p\u00f3sitron.<\/span><\/p>\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-youtube su-u-responsive-media-yes\"><iframe class=\"lazy-loaded\" title=\"\" src=\"https:\/\/www.youtube.com\/embed\/rCtWyYX3kkY?\" width=\"900\" height=\"600\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-lazy-type=\"iframe\" data-src=\"https:\/\/www.youtube.com\/embed\/rCtWyYX3kkY?\" data-mce-fragment=\"1\"><\/iframe><\/div>\n<\/div>\n<\/div>\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\"><\/div>\n<\/div>\n<\/div>\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","protected":false},"excerpt":{"rendered":"<p>A natureza de uma intera\u00e7\u00e3o de uma radia\u00e7\u00e3o beta com a mat\u00e9ria \u00e9 diferente da radia\u00e7\u00e3o alfa, apesar do fato de que as part\u00edculas beta tamb\u00e9m s\u00e3o part\u00edculas carregadas.\u00a0Dosimetria de Radia\u00e7\u00e3o Natureza da intera\u00e7\u00e3o da radia\u00e7\u00e3o beta com a mat\u00e9ria Resumo dos tipos de intera\u00e7\u00f5es: Colis\u00f5es inel\u00e1sticas com el\u00e9trons at\u00f4micos (excita\u00e7\u00e3o e ioniza\u00e7\u00e3o) Espalhamento el\u00e1stico &#8230; <a title=\"Qual \u00e9 a natureza da intera\u00e7\u00e3o da radia\u00e7\u00e3o beta com a mat\u00e9ria &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/qual-e-a-natureza-da-interacao-da-radiacao-beta-com-a-materia-definicao\/\" aria-label=\"More on Qual \u00e9 a natureza da intera\u00e7\u00e3o da radia\u00e7\u00e3o beta com a mat\u00e9ria &#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>Qual \u00e9 a natureza da intera\u00e7\u00e3o da radia\u00e7\u00e3o beta com a mat\u00e9ria - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A natureza de uma intera\u00e7\u00e3o de uma radia\u00e7\u00e3o beta com a mat\u00e9ria \u00e9 diferente da radia\u00e7\u00e3o alfa, apesar do fato de que as part\u00edculas beta tamb\u00e9m s\u00e3o part\u00edculas carregadas. 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