{"id":17577,"date":"2020-06-15T16:00:31","date_gmt":"2020-06-15T16:00:31","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-o-detector-cherenkov-vs-detector-de-cintilacao-definicao\/"},"modified":"2020-07-21T11:38:00","modified_gmt":"2020-07-21T11:38:00","slug":"o-que-e-o-detector-cherenkov-vs-detector-de-cintilacao-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-detector-cherenkov-vs-detector-de-cintilacao-definicao\/","title":{"rendered":"O que \u00e9 o Detector Cherenkov vs Detector de Cintila\u00e7\u00e3o &#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\">Detector de Cherenkov vs Detector de cintila\u00e7\u00e3o.\u00a0Os detectores de cintiladores t\u00edpicos t\u00eam um tempo de decaimento medido em microssegundos, enquanto a radia\u00e7\u00e3o Cherenkov \u00e9 quase instant\u00e2nea.\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>Cherenkov Detectors<\/h2>\n<p>Um\u00a0<strong>detector Cherenkov<\/strong>\u00a0\u00e9 um detector de part\u00edculas, que se baseia na detec\u00e7\u00e3o da\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/cherenkov-radiation\/\"><strong>radia\u00e7\u00e3o Cherenkov<\/strong><\/a>\u00a0(luz vis\u00edvel ou f\u00f3tons UV).\u00a0Em contraste com um\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/scintillation-counter-scintillation-detector\/\">contador de cintila\u00e7\u00e3o,<\/a>\u00a0a produ\u00e7\u00e3o de luz \u00e9 instant\u00e2nea.\u00a0Os detectores de cintiladores t\u00edpicos t\u00eam um tempo de decaimento medido em microssegundos, enquanto a radia\u00e7\u00e3o Cherenkov \u00e9 quase instant\u00e2nea e, com equipamentos de processamento de pulso r\u00e1pido, pode ser medido em picossegundos.\u00a0<strong>Os contadores Cherenkov<\/strong>\u00a0s\u00e3o utilizados principalmente para a\u00a0<strong>identifica\u00e7\u00e3o de part\u00edculas<\/strong>\u00a0, ou seja, para a determina\u00e7\u00e3o de massas de part\u00edculas.\u00a0Os contadores de Cherenkov cont\u00eam dois elementos principais:<\/p>\n<ul>\n<li>um radiador atrav\u00e9s do qual a part\u00edcula carregada passa,<\/li>\n<li>um\u00a0<strong>fotodetector<\/strong>\u00a0(por exemplo, um\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/scintillation-counter-scintillation-detector\/photomultiplier-tube-pmt\/\">tubo fotomultiplicador &#8211; PMT<\/a>\u00a0).<\/li>\n<\/ul>\n<p><strong>A radia\u00e7\u00e3o Cherenkov,<\/strong>\u00a0produzida no radiador, \u00e9 radia\u00e7\u00e3o eletromagn\u00e9tica emitida quando uma part\u00edcula carregada (como um el\u00e9tron) se move atrav\u00e9s de um meio diel\u00e9trico mais r\u00e1pido que\u00a0<strong>a velocidade da fase da luz nesse meio<\/strong>\u00a0.\u00a0Part\u00edculas que excedem a velocidade da fase da luz resultam em polariza\u00e7\u00e3o ao longo do eixo do movimento, criando um campo dipolo.\u00a0Quando esse campo entra em colapso, um pulso eletromagn\u00e9tico (radia\u00e7\u00e3o Cherenkov) \u00e9 emitido na dire\u00e7\u00e3o direta.<\/p>\n<p><strong>A radia\u00e7\u00e3o de Cherenkov<\/strong>\u00a0\u00e9 comumente produzida em materiais diel\u00e9tricos atrav\u00e9s de el\u00e9trons de Compton ou el\u00e9trons de produ\u00e7\u00e3o de pares e p\u00f3sitrons.\u00a0A intensidade da luz produzida por esse processo \u00e9 muito menor que a da luminesc\u00eancia (a base para a opera\u00e7\u00e3o do detector de cintila\u00e7\u00e3o), exigindo equipamentos de detec\u00e7\u00e3o de f\u00f3tons \u00f3pticos mais sens\u00edveis, como\u00a0<strong>tubos<\/strong>\u00a0fotocomplicadores\u00a0com\u00a0<strong>pouca luz<\/strong>\u00a0(PMT).\u00a0Os contadores de Cherenkov podem ser classificados como tipos de\u00a0<strong>imagem<\/strong>\u00a0ou de\u00a0<strong>limiar<\/strong>\u00a0, dependendo de utilizarem ou n\u00e3o informa\u00e7\u00f5es de \u00e2ngulo de Cherenkov (\u03b8).\u00a0No caso simples de um\u00a0<strong>detector de limiar<\/strong>a energia limiar dependente da massa permite a discrimina\u00e7\u00e3o entre uma part\u00edcula mais leve (que irradia) e uma part\u00edcula mais pesada (que n\u00e3o irradia) da mesma energia ou momento.\u00a0<strong>Os contadores de imagens<\/strong>\u00a0podem ser usados \u200b\u200bpara rastrear part\u00edculas e identific\u00e1-las.\u00a0Embora os dispositivos que usam radia\u00e7\u00e3o Cherenkov sejam freq\u00fcentemente considerados detectores de identifica\u00e7\u00e3o por part\u00edculas (PID), na pr\u00e1tica, eles s\u00e3o amplamente utilizados em uma variedade muito maior de aplica\u00e7\u00f5es;\u00a0Incluindo:<\/p>\n<ul>\n<li>contadores de part\u00edculas r\u00e1pidos<\/li>\n<li>identifica\u00e7\u00e3o de part\u00edculas hadr\u00f4nicas<\/li>\n<li>detectores de rastreamento realizando reconstru\u00e7\u00e3o completa de eventos.<\/li>\n<\/ul>\n<header class=\"entry-header\">\n<h2 class=\"entry-title\">Contadores de cintila\u00e7\u00e3o<\/h2>\n<\/header>\n<div class=\"entry-content\">\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><span>Um\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/scintillation-counter-scintillation-detector\/\"><strong><span>contador de cintila\u00e7\u00e3o<\/span><\/strong><\/a><span>\u00a0\u00a0ou\u00a0\u00a0<\/span><strong><span>detector de cintila\u00e7\u00e3o<\/span><\/strong><span>\u00a0\u00a0\u00e9 um detector de radia\u00e7\u00e3o que usa o efeito conhecido como\u00a0\u00a0<\/span><strong><span>cintila\u00e7\u00e3o<\/span><\/strong><span>\u00a0.\u00a0A cintila\u00e7\u00e3o \u00e9 um\u00a0\u00a0<\/span><strong><span>flash de luz<\/span><\/strong><span>\u00a0\u00a0produzido em um material transparente pela passagem de uma part\u00edcula (um el\u00e9tron, uma part\u00edcula alfa, um \u00edon ou um f\u00f3ton de alta energia).\u00a0A cintila\u00e7\u00e3o ocorre no cintilador, que \u00e9 uma parte essencial de um detector de cintila\u00e7\u00e3o.\u00a0Em geral, um detector de cintila\u00e7\u00e3o consiste em:<\/span><\/p>\n<ul>\n<li><strong><span>Cintilador<\/span><\/strong><span>\u00a0.\u00a0Um cintilador gera f\u00f3tons em resposta \u00e0 radia\u00e7\u00e3o incidente.<\/span><\/li>\n<li><strong><span>Fotodetector<\/span><\/strong><span>\u00a0.\u00a0Um fotodetector sens\u00edvel (geralmente um tubo fotomultiplicador (PMT), uma c\u00e2mera de dispositivo acoplado a carga (CCD) ou um fotodiodo), que converte a luz em um sinal el\u00e9trico e eletr\u00f4nico para processar esse sinal.<\/span><\/li>\n<\/ul>\n<p><span>O princ\u00edpio b\u00e1sico de opera\u00e7\u00e3o envolve a rea\u00e7\u00e3o da radia\u00e7\u00e3o com um cintilador, que produz uma s\u00e9rie de flashes de intensidade vari\u00e1vel.\u00a0A intensidade dos flashes \u00e9 proporcional \u00e0 energia da radia\u00e7\u00e3o.\u00a0Esse recurso \u00e9 muito importante.\u00a0Esses contadores s\u00e3o adequados para medir a energia da radia\u00e7\u00e3o gama (\u00a0<\/span><strong><span>espectroscopia gama<\/span><\/strong><span>\u00a0) e, portanto, podem ser usados \u200b\u200bpara identificar is\u00f3topos emissores gama.<\/span><\/p>\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<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Detector de Cherenkov vs Detector de cintila\u00e7\u00e3o.\u00a0Os detectores de cintiladores t\u00edpicos t\u00eam um tempo de decaimento medido em microssegundos, enquanto a radia\u00e7\u00e3o Cherenkov \u00e9 quase instant\u00e2nea.\u00a0Dosimetria de Radia\u00e7\u00e3o Cherenkov Detectors Um\u00a0detector Cherenkov\u00a0\u00e9 um detector de part\u00edculas, que se baseia na detec\u00e7\u00e3o da\u00a0radia\u00e7\u00e3o Cherenkov\u00a0(luz vis\u00edvel ou f\u00f3tons UV).\u00a0Em contraste com um\u00a0contador de cintila\u00e7\u00e3o,\u00a0a produ\u00e7\u00e3o de luz &#8230; <a title=\"O que \u00e9 o Detector Cherenkov vs Detector de Cintila\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-detector-cherenkov-vs-detector-de-cintilacao-definicao\/\" aria-label=\"More on O que \u00e9 o Detector Cherenkov vs Detector de Cintila\u00e7\u00e3o &#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 o Detector Cherenkov vs Detector de Cintila\u00e7\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Detector de Cherenkov vs Detector de cintila\u00e7\u00e3o. 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