{"id":17698,"date":"2020-06-18T20:01:29","date_gmt":"2020-06-18T20:01:29","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-o-ciclo-de-vida-dos-neutrons-definicao\/"},"modified":"2020-07-22T06:51:49","modified_gmt":"2020-07-22T06:51:49","slug":"o-que-e-o-ciclo-de-vida-dos-neutrons-definicao","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-ciclo-de-vida-dos-neutrons-definicao\/","title":{"rendered":"O que \u00e9 o ciclo de vida dos n\u00eautrons &#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\">O ciclo de vida dos n\u00eautrons quantifica os processos f\u00edsicos de n\u00eautrons mais importantes que ocorrem no reator nuclear.\u00a0Esses processos do ciclo de vida dos n\u00eautrons s\u00e3o quantificados por seus fatores.\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<div class=\"su-spacer\"><\/div>\n<p>O\u00a0<strong>ciclo de vida dos n\u00eautrons<\/strong>\u00a0quantifica os\u00a0<strong>processos f\u00edsicos de n\u00eautrons<\/strong>\u00a0mais importantes\u00a0que ocorrem no\u00a0<a title=\"Reator nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/\">\u00a0reator nuclear<\/a>\u00a0.\u00a0No reator, os n\u00eautrons s\u00e3o produzidos como n\u00eautrons r\u00e1pidos e a maioria deles \u00e9 absorvida ap\u00f3s a termiza\u00e7\u00e3o.\u00a0Existem\u00a0<strong>seis processos (fatores)<\/strong>\u00a0\u00a0que descrevem a\u00a0<strong>capacidade inerente de multiplica\u00e7\u00e3o<\/strong>\u00a0do sistema.\u00a0Quatro deles s\u00e3o completamente independentes do tamanho e formato do reator e s\u00e3o eles:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Neutron-Life-Cycle.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-26060 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Neutron-Life-Cycle-300x282.png\" alt=\"Ciclo de vida dos n\u00eautrons\" width=\"300\" height=\"282\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Neutron-Life-Cycle-300x282.png\" \/><\/a>Fiss\u00e3o r\u00e1pida<\/strong>\u00a0.\u00a0<strong>O processo de fiss\u00e3o r\u00e1pida<\/strong>\u00a0est\u00e1 no fator de multiplica\u00e7\u00e3o caracterizado pelo\u00a0<strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/fast-fission-factor\/\">fator de fiss\u00e3o r\u00e1pida<\/a>\u00a0, \u03b5<\/strong>\u00a0, que aumenta a popula\u00e7\u00e3o r\u00e1pida de n\u00eautrons em uma gera\u00e7\u00e3o de n\u00eautrons.\u00a0O fator de fiss\u00e3o r\u00e1pida \u00e9 definido como a raz\u00e3o entre os n\u00eautrons r\u00e1pidos produzidos pelas fiss\u00f5es em todas as energias e o n\u00famero de n\u00eautrons r\u00e1pidos produzidos na fiss\u00e3o t\u00e9rmica.<\/li>\n<li><strong>Resson\u00e2ncia Escape<\/strong>\u00a0.\u00a0<strong>A\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/resonance-escape-probability\/\">probabilidade de escape de resson\u00e2ncia<\/a><\/strong>\u00a0, simbolizada por p, \u00e9 a probabilidade de um n\u00eautron ser reduzido \u00e0 energia t\u00e9rmica e escapar da\u00a0<a title=\"O que \u00e9 resson\u00e2ncia nuclear - n\u00facleo composto\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/compound-nucleus-reactions\/what-is-nuclear-resonance-compound-nucleus\/\">captura de resson\u00e2ncia<\/a>\u00a0.\u00a0Essa probabilidade \u00e9 definida como a raz\u00e3o entre o n\u00famero de n\u00eautrons que atingem as energias t\u00e9rmicas e o n\u00famero de n\u00eautrons r\u00e1pidos que come\u00e7am a desacelerar.<\/li>\n<li><strong>Utiliza\u00e7\u00e3o T\u00e9rmica<\/strong>\u00a0.\u00a0<strong>O\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/thermal-utilization-factor\/\">fator de utiliza\u00e7\u00e3o t\u00e9rmica<\/a>\u00a0, f<\/strong>\u00a0, \u00e9 a fra\u00e7\u00e3o dos\u00a0<a title=\"N\u00eautron t\u00e9rmico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/thermal-neutron\/\">n\u00eautrons t\u00e9rmicos<\/a>\u00a0que s\u00e3o absorvidos no\u00a0<a title=\"Combust\u00edvel nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/\">combust\u00edvel nuclear<\/a>\u00a0, em todos os is\u00f3topos do combust\u00edvel nuclear.\u00a0Ele descreve com que efic\u00e1cia (qu\u00e3o bem s\u00e3o utilizados) os n\u00eautrons t\u00e9rmicos s\u00e3o absorvidos no combust\u00edvel.\u00a0O valor do fator de utiliza\u00e7\u00e3o t\u00e9rmica \u00e9 dado pela raz\u00e3o entre o n\u00famero de n\u00eautrons t\u00e9rmicos absorvidos no combust\u00edvel (todos os nucl\u00eddeos) e o n\u00famero de n\u00eautrons t\u00e9rmicos absorvidos em todo o material que comp\u00f5e o\u00a0<a title=\"N\u00facleo do reator\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor-core\/\">n\u00facleo<\/a>\u00a0.<\/li>\n<li><strong>Reprodu\u00e7\u00e3o<\/strong>\u00a0.\u00a0O n\u00famero de neutr\u00f5es criadas na nova gera\u00e7\u00e3o \u00e9 determinado\u00a0<strong>pelo\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/reproduction-factor\/\">factor de reprodu\u00e7\u00e3o de neutr\u00f5es<\/a><\/strong>\u00a0.\u00a0<strong>O fator de reprodu\u00e7\u00e3o, \u03b7<\/strong>\u00a0, \u00e9 definido como a raz\u00e3o entre o n\u00famero de n\u00eautrons r\u00e1pidos produzidos pela fiss\u00e3o t\u00e9rmica e o n\u00famero\u00a0<a title=\"N\u00eautron t\u00e9rmico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/thermal-neutron\/\">de n\u00eautrons t\u00e9rmicos<\/a>\u00a0absorvidos no combust\u00edvel.<\/li>\n<\/ul>\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<p>Esses processos do ciclo de vida dos n\u00eautrons, quantificados por seus fatores, constituem o fator de multiplica\u00e7\u00e3o infinito (k\u00a0<sub>\u221e<\/sub>\u00a0), que pode ser expresso matematicamente em termos desses fatores, seguindo a equa\u00e7\u00e3o, geralmente conhecida como\u00a0<a title=\"F\u00f3rmula de Quatro Fatores - Fator de Multiplica\u00e7\u00e3o Infinita\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/four-factor-formula-infinite-multiplication-factor\/\"><strong>f\u00f3rmula<\/strong><\/a>\u00a0dos\u00a0<a title=\"F\u00f3rmula de Quatro Fatores - Fator de Multiplica\u00e7\u00e3o Infinita\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/four-factor-formula-infinite-multiplication-factor\/\"><strong>quatro fatores<\/strong><\/a>\u00a0:<\/p>\n<p><strong>k\u00a0<sub>\u221e<\/sub>\u00a0\u00a0= \u03b7.\u03b5.pf<\/strong><\/p>\n<p><strong>O fator de multiplica\u00e7\u00e3o efetivo<\/strong>\u00a0(\u00a0<strong>k\u00a0<sub>eff<\/sub><\/strong>\u00a0) pode ser expresso matematicamente em termos do fator de multiplica\u00e7\u00e3o infinito (k\u00a0<sub>\u221e<\/sub>\u00a0) e dois fatores adicionais que explicam o\u00a0<strong>vazamento de<\/strong>\u00a0n\u00eautrons durante a t\u00e9rmicaiza\u00e7\u00e3o de n\u00eautrons (\u00a0<strong>probabilidade r\u00e1pida de n\u00e3o vazamento<\/strong>\u00a0) e o vazamento de n\u00eautrons durante a difus\u00e3o de n\u00eautrons (\u00a0<strong>temperatura t\u00e9rmica). probabilidade de n\u00e3o vazamento<\/strong>\u00a0), seguindo a equa\u00e7\u00e3o, geralmente conhecida como\u00a0<strong>f\u00f3rmula<\/strong>\u00a0dos\u00a0<strong>seis fatores<\/strong>\u00a0:<\/p>\n<p><strong>k\u00a0<sub>eff<\/sub>\u00a0= k\u00a0<sub>\u221e<\/sub>\u00a0.\u00a0P\u00a0<sub>f<\/sub>\u00a0.\u00a0P\u00a0<sub>t<\/sub><\/strong><\/p>\n<ul>\n<li><strong>Probabilidade r\u00e1pida de n\u00e3o vazamento<\/strong>\u00a0.\u00a0Durante o processo de desacelera\u00e7\u00e3o, alguns dos\u00a0<a title=\"N\u00eautron\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\">n\u00eautrons\u00a0<\/a><strong>vazam para fora<\/strong>\u00a0dos limites do\u00a0<a title=\"N\u00facleo do reator\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor-core\/\">n\u00facleo<\/a>\u00a0do\u00a0<a title=\"N\u00facleo do reator\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor-core\/\">reator<\/a>\u00a0antes de se tornarem\u00a0<strong>termizados<\/strong>\u00a0.\u00a0Esse processo e seu impacto no fator de multiplica\u00e7\u00e3o efetivo s\u00e3o caracterizados pelo fator\u00a0<a title=\"Probabilidade r\u00e1pida de n\u00e3o vazamento\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/fast-non-leakage-probability\/\">r\u00e1pido de n\u00e3o vazamento<\/a>\u00a0, P\u00a0<sub>f<\/sub>\u00a0, que \u00e9 definido como a raz\u00e3o do n\u00famero de n\u00eautrons r\u00e1pidos que n\u00e3o vazam do n\u00facleo do reator durante o processo de desacelera\u00e7\u00e3o para o n\u00famero de n\u00eautrons r\u00e1pidos produzidos por fiss\u00f5es em todas as energias.<\/li>\n<li><strong>Probabilidade de n\u00e3o vazamento t\u00e9rmico<\/strong>\u00a0.\u00a0Durante a\u00a0<strong>difus\u00e3o de n\u00eautrons<\/strong>\u00a0, alguns dos n\u00eautrons vazam para fora dos limites do n\u00facleo do reator antes de serem absorvidos.\u00a0Esse processo e seu impacto no fator de multiplica\u00e7\u00e3o efetivo s\u00e3o caracterizados pelo fator\u00a0<a title=\"Probabilidade de n\u00e3o vazamento t\u00e9rmico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-fission-chain-reaction\/thermal-non-leakage-probability\/\">t\u00e9rmico de n\u00e3o vazamento<\/a>\u00a0, P\u00a0<sub>t<\/sub>\u00a0, que \u00e9 definido como a raz\u00e3o do n\u00famero de n\u00eautrons t\u00e9rmicos que n\u00e3o vazam do n\u00facleo do reator durante o processo de difus\u00e3o de n\u00eautrons para o n\u00famero de n\u00eautrons que atingem as energias t\u00e9rmicas.<\/li>\n<\/ul>\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<p>Na\u00a0<a title=\"F\u00edsica do Reator\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/\">f\u00edsica do reator<\/a>\u00a0,\u00a0<strong>k\u00a0<sub>eff<\/sub><\/strong>\u00a0\u00a0\u00e9 o par\u00e2metro mais significativo em rela\u00e7\u00e3o ao controle do reator.\u00a0A qualquer n\u00edvel de pot\u00eancia espec\u00edfica ou condi\u00e7\u00e3o do reactor,\u00a0<strong>k\u00a0<sub>ef<\/sub><\/strong>\u00a0\u00a0\u00e9 mantida t\u00e3o perto para o valor de\u00a0<strong>1,0<\/strong>\u00a0quanto poss\u00edvel.\u00a0Nesse ponto da opera\u00e7\u00e3o, o\u00a0<strong>equil\u00edbrio de n\u00eautrons<\/strong>\u00a0\u00e9 mantido em exatamente um n\u00eautron, completando o ciclo de vida de cada n\u00eautron original absorvido no combust\u00edvel.<\/p>\n<h2><span>Ciclo de vida de n\u00eautrons em reatores r\u00e1pidos<\/span><\/h2>\n<figure id=\"attachment_13563\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-13563\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thermal-vs-fast-reactor-neutron-spectrum-min.png\"><img loading=\"lazy\" class=\"wp-image-13563 size-medium lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thermal-vs-fast-reactor-neutron-spectrum-min-300x300.png\" alt=\"espectro de n\u00eautrons de reator t\u00e9rmico vs. r\u00e1pido\" width=\"300\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thermal-vs-fast-reactor-neutron-spectrum-min-300x300.png\" \/><\/a><figcaption id=\"caption-attachment-13563\" class=\"wp-caption-text\"><span>O espectro de energias de n\u00eautrons produzidas pela fiss\u00e3o varia significativamente com o design de certos reatores.\u00a0espectro de n\u00eautrons de reator t\u00e9rmico vs. r\u00e1pido<\/span><\/figcaption><\/figure>\n<p><span>O m\u00e9todo de c\u00e1lculo dos fatores de multiplica\u00e7\u00e3o foi desenvolvido\u00a0<\/span><strong><span>nos primeiros anos<\/span><\/strong><span>\u00a0da energia nuclear e \u00e9 aplic\u00e1vel apenas a\u00a0<\/span><strong><span>reatores t\u00e9rmicos<\/span><\/strong><span>\u00a0, onde a maior parte das rea\u00e7\u00f5es de fiss\u00e3o ocorre em energias t\u00e9rmicas.\u00a0Esse m\u00e9todo coloca bem o contexto em todos os processos associados aos reatores t\u00e9rmicos (por exemplo, a termiza\u00e7\u00e3o de n\u00eautrons, a difus\u00e3o de n\u00eautrons ou a fiss\u00e3o r\u00e1pida), porque os processos f\u00edsico-n\u00eautrons mais importantes ocorrem em\u00a0<\/span><strong><span>regi\u00f5es de<\/span><\/strong><span>\u00a0energia\u00a0<strong>que podem ser claramente separadas um do outro<\/strong>\u00a0.\u00a0Em resumo, o c\u00e1lculo do fator de multiplica\u00e7\u00e3o fornece uma boa vis\u00e3o dos processos que ocorrem em cada sistema de multiplica\u00e7\u00e3o t\u00e9rmica.<\/span><\/p>\n<p><span>Para\u00a0<\/span><a title=\"Reator R\u00e1pido de N\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/fast-neutron-reactor\/\"><strong><span>reatores r\u00e1pidos<\/span><\/strong><\/a><span>\u00a0, nos quais a fiss\u00e3o \u00e9 causada por n\u00eautrons com uma distribui\u00e7\u00e3o de energia muito ampla, essa an\u00e1lise \u00e9 inadequada.\u00a0O\u00a0<\/span><a title=\"Espectros de fluxo de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-flux-spectra\/\"><span>fluxo de n\u00eautrons<\/span><\/a><span>\u00a0em reatores r\u00e1pidos deve ser dividido em\u00a0<\/span><strong><span>muitos grupos de energia<\/span><\/strong><span>\u00a0.\u00a0Al\u00e9m disso, em reatores r\u00e1pidos, a termiza\u00e7\u00e3o por n\u00eautrons \u00e9 um processo indesej\u00e1vel e, portanto, a f\u00f3rmula de quatro fatores n\u00e3o faz realmente nenhum sentido.\u00a0A probabilidade de escape de resson\u00e2ncia n\u00e3o \u00e9 significativa porque existem muito poucos n\u00eautrons em energias em que a absor\u00e7\u00e3o de resson\u00e2ncia \u00e9 significativa.\u00a0A probabilidade t\u00e9rmica de n\u00e3o vazamento n\u00e3o existe porque o reator \u00e9 projetado para evitar a termiza\u00e7\u00e3o dos n\u00eautrons.<\/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","protected":false},"excerpt":{"rendered":"<p>O ciclo de vida dos n\u00eautrons quantifica os processos f\u00edsicos de n\u00eautrons mais importantes que ocorrem no reator nuclear.\u00a0Esses processos do ciclo de vida dos n\u00eautrons s\u00e3o quantificados por seus fatores.\u00a0Dosimetria de Radia\u00e7\u00e3o O\u00a0ciclo de vida dos n\u00eautrons\u00a0quantifica os\u00a0processos f\u00edsicos de n\u00eautrons\u00a0mais importantes\u00a0que ocorrem no\u00a0\u00a0reator nuclear\u00a0.\u00a0No reator, os n\u00eautrons s\u00e3o produzidos como n\u00eautrons r\u00e1pidos e &#8230; <a title=\"O que \u00e9 o ciclo de vida dos n\u00eautrons &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-ciclo-de-vida-dos-neutrons-definicao\/\" aria-label=\"More on O que \u00e9 o ciclo de vida dos n\u00eautrons &#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 ciclo de vida dos n\u00eautrons - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O ciclo de vida dos n\u00eautrons quantifica os processos f\u00edsicos de n\u00eautrons mais importantes que ocorrem no reator nuclear. 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