{"id":17495,"date":"2020-06-14T14:35:45","date_gmt":"2020-06-14T14:35:45","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-folha-de-ativacao-e-fio-de-fluxo-definicao\/"},"modified":"2020-07-21T10:33:22","modified_gmt":"2020-07-21T10:33:22","slug":"o-que-e-folha-de-ativacao-e-fio-de-fluxo-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-folha-de-ativacao-e-fio-de-fluxo-definicao\/","title":{"rendered":"O que \u00e9 Folha de Ativa\u00e7\u00e3o e Fio de Fluxo &#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\">Os n\u00eautrons podem ser detectados usando folhas de ativa\u00e7\u00e3o e fios de fluxo.\u00a0Este m\u00e9todo \u00e9 baseado na ativa\u00e7\u00e3o de n\u00eautrons, onde uma amostra analisada \u00e9 primeiro irradiada com n\u00eautrons para produzir radionucl\u00eddeos espec\u00edficos.\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<figure id=\"attachment_11545\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-11545\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neutron-detection.png\"><img loading=\"lazy\" class=\"wp-image-11545 size-medium lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neutron-detection-300x232.png\" alt=\"detec\u00e7\u00e3o de n\u00eautrons\" width=\"300\" height=\"232\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neutron-detection-300x232.png\" \/><\/a><figcaption id=\"caption-attachment-11545\" class=\"wp-caption-text\">Geralmente, todo tipo de detector de n\u00eautrons deve estar equipado com conversor e um dos detectores de radia\u00e7\u00e3o convencionais.<br \/>\nFonte: large.stanford.edu<\/figcaption><\/figure>\n<p>Os n\u00eautrons podem ser detectados usando\u00a0<strong>folhas de ativa\u00e7\u00e3o<\/strong>\u00a0e\u00a0<strong>fios de fluxo<\/strong>\u00a0.\u00a0Este m\u00e9todo \u00e9 baseado na ativa\u00e7\u00e3o de n\u00eautrons, onde uma amostra analisada \u00e9\u00a0<strong>primeiro irradiada<\/strong>\u00a0com n\u00eautrons para produzir\u00a0<strong>radionucl\u00eddeos espec\u00edficos<\/strong>\u00a0.\u00a0O decaimento radioativo desses radionucl\u00eddeos produzidos \u00e9 espec\u00edfico para cada elemento (nucl\u00eddeo).\u00a0Cada nucl\u00eddeo emite os\u00a0<strong>raios gama caracter\u00edsticos<\/strong>\u00a0que s\u00e3o medidos usando\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gamma-spectroscopy\/\"><strong>espectroscopia gama<\/strong><\/a>\u00a0, onde os raios gama detectados em uma energia espec\u00edfica s\u00e3o indicativos de um radionucl\u00eddeo espec\u00edfico e determinam as concentra\u00e7\u00f5es dos elementos.<\/p>\n<p>Os materiais selecionados para folhas de ativa\u00e7\u00e3o s\u00e3o, por exemplo:<\/p>\n<ul>\n<li><strong>\u00edndio,<\/strong><\/li>\n<li><strong>ouro,<\/strong><\/li>\n<li><strong>r\u00f3dio,<\/strong><\/li>\n<li><strong>ferro<\/strong><\/li>\n<li><strong>alum\u00ednio \u2009<\/strong><\/li>\n<li><strong>ni\u00f3bio<\/strong><\/li>\n<\/ul>\n<p>Esses elementos t\u00eam\u00a0<strong>grandes se\u00e7\u00f5es transversais<\/strong>\u00a0para a\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-capture-radiative-capture\/\">captura radiativa de n\u00eautrons<\/a>\u00a0.\u00a0O uso de m\u00faltiplas amostras de absorvedores permite a caracteriza\u00e7\u00e3o do espectro de energia de n\u00eautrons.\u00a0A ativa\u00e7\u00e3o tamb\u00e9m permite a recrea\u00e7\u00e3o de uma exposi\u00e7\u00e3o hist\u00f3rica a n\u00eautrons.\u00a0Os dos\u00edmetros de acidentes por criticidade comercialmente dispon\u00edveis geralmente utilizam esse m\u00e9todo.\u00a0Medindo a\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/radioactivity-nuclear-decay\/\">radioatividade<\/a>\u00a0de folhas finas, podemos determinar a quantidade de n\u00eautrons a que as folhas foram expostas.<\/p>\n<p><strong>Os fios de fluxo<\/strong>\u00a0podem ser usados \u200b\u200bem reatores nucleares para medir os perfis de fluxo de n\u00eautrons do reator.\u00a0Princ\u00edpios s\u00e3o os mesmos.\u00a0O fio ou a folha \u00e9 inserido diretamente no\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor-core\/\">n\u00facleo<\/a>\u00a0do\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor-core\/\">reator<\/a>\u00a0, permanece no n\u00facleo pelo per\u00edodo de tempo necess\u00e1rio para a ativa\u00e7\u00e3o no n\u00edvel desejado.\u00a0Ap\u00f3s a ativa\u00e7\u00e3o, o fio ou a pel\u00edcula de fluxo \u00e9 rapidamente removido do n\u00facleo do reator e a atividade \u00e9 contada.\u00a0As folhas ativadas tamb\u00e9m podem discriminar os n\u00edveis de energia, colocando uma cobertura sobre a folha para filtrar (absorver) certos n\u00eautrons do n\u00edvel de energia.\u00a0Por exemplo, o\u00a0<a href=\"https:\/\/www.nuclear-power.com\/glossary\/cadmium\/\">c\u00e1dmio<\/a> \u00e9 amplamente usado para absorver n\u00eautrons t\u00e9rmicos em filtros de n\u00eautrons t\u00e9rmicos.<\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\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>Os n\u00eautrons podem ser detectados usando folhas de ativa\u00e7\u00e3o e fios de fluxo.\u00a0Este m\u00e9todo \u00e9 baseado na ativa\u00e7\u00e3o de n\u00eautrons, onde uma amostra analisada \u00e9 primeiro irradiada com n\u00eautrons para produzir radionucl\u00eddeos espec\u00edficos.\u00a0Dosimetria de Radia\u00e7\u00e3o Geralmente, todo tipo de detector de n\u00eautrons deve estar equipado com conversor e um dos detectores de radia\u00e7\u00e3o convencionais. Fonte: &#8230; <a title=\"O que \u00e9 Folha de Ativa\u00e7\u00e3o e Fio de Fluxo &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-folha-de-ativacao-e-fio-de-fluxo-definicao\/\" aria-label=\"More on O que \u00e9 Folha de Ativa\u00e7\u00e3o e Fio de Fluxo &#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 Folha de Ativa\u00e7\u00e3o e Fio de Fluxo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Os n\u00eautrons podem ser detectados usando folhas de ativa\u00e7\u00e3o e fios de fluxo. 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