{"id":17497,"date":"2020-06-14T15:18:24","date_gmt":"2020-06-14T15:18:24","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-neutron-de-fissao-definicao\/"},"modified":"2020-07-21T10:32:01","modified_gmt":"2020-07-21T10:32:01","slug":"o-que-e-neutron-de-fissao-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-neutron-de-fissao-definicao\/","title":{"rendered":"O que \u00e9 n\u00eautron de fiss\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\">Os n\u00eautrons de fiss\u00e3o s\u00e3o n\u00eautrons produzidos na fiss\u00e3o nuclear.\u00a0Eles t\u00eam espectro t\u00edpico e sabe-se que os n\u00eautrons de fiss\u00e3o s\u00e3o importantes em qualquer sistema de rea\u00e7\u00e3o em cadeia.\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<p><strong>Os n\u00eautrons de fiss\u00e3o<\/strong>\u00a0s\u00e3o n\u00eautrons produzidos na\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/\">fiss\u00e3o nuclear<\/a>\u00a0.\u00a0Eles t\u00eam espectro t\u00edpico e sabe-se que os\u00a0<strong>n\u00eautrons de fiss\u00e3o<\/strong>\u00a0s\u00e3o importantes em qualquer sistema de rea\u00e7\u00e3o em cadeia.\u00a0<a title=\"N\u00eautron\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\">Os n\u00eautrons<\/a>\u00a0\u00a0desencadeiam a\u00a0\u00a0<a title=\"Fic\u00e3o nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/\">fiss\u00e3o nuclear<\/a>\u00a0\u00a0de alguns n\u00facleos (\u00a0<a title=\"Ur\u00e2nio 235\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-235\/\"><sup>235<\/sup>\u00a0U<\/a>\u00a0,\u00a0\u00a0<a title=\"Ur\u00e2nio 238\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-238\/\"><sup>238<\/sup>\u00a0U<\/a>\u00a0\u00a0ou mesmo\u00a0\u00a0<a title=\"T\u00f3rio 232\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/thorium\/thorium-232\/\"><sup>232<\/sup>\u00a0Th<\/a>\u00a0).\u00a0O que \u00e9 crucial a fiss\u00e3o de tais n\u00facleos produz\u00a0\u00a0<strong>2, 3 ou mais\u00a0<\/strong>\u00a0<a title=\"N\u00eautron gr\u00e1tis\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/free-neutron\/\">n\u00eautrons livres<\/a>\u00a0.<\/p>\n<p>Mas nem todos os n\u00eautrons s\u00e3o liberados\u00a0\u00a0<strong>ao mesmo tempo ap\u00f3s a fiss\u00e3o<\/strong>\u00a0.\u00a0At\u00e9 a natureza da cria\u00e7\u00e3o desses n\u00eautrons \u00e9 diferente.\u00a0Deste ponto de vista, geralmente dividimos os\u00a0<strong>n\u00eautrons de fiss\u00e3o<\/strong>\u00a0em dois grupos a seguir:<\/p>\n<ul>\n<li><strong><a title=\"N\u00eautrons Prompt\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/prompt-neutrons\/\">N\u00eautrons Prompt<\/a>\u00a0.\u00a0<\/strong>\u00a0Os n\u00eautrons imediatos s\u00e3o emitidos\u00a0<strong>\u00a0diretamente da fiss\u00e3o<\/strong>\u00a0\u00a0e s\u00e3o emitidos dentro de\u00a0<strong>\u00a0um per\u00edodo muito curto de cerca de 10 a\u00a0<sup>14<\/sup>\u00a0\u00a0segundos<\/strong>\u00a0.<\/li>\n<li><strong><a title=\"N\u00eautrons atrasados\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/delayed-neutrons\/\">N\u00eautrons atrasados<\/a>\u00a0.\u00a0<\/strong>\u00a0Os n\u00eautrons atrasados \u200b\u200bs\u00e3o emitidos por\u00a0<strong><a title=\"Fission Fragments\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/fission-fragments\/\">\u00a0fragmentos de fiss\u00e3o<\/a><\/strong><strong>\u00a0ricos em n\u00eautrons,\u00a0<\/strong>\u00a0\u00a0chamados<strong>\u00a0\u00a0precursores atrasados \u200b\u200bde n\u00eautrons<\/strong>\u00a0.\u00a0Esses precursores geralmente sofrem\u00a0<a title=\"Part\u00edcula Beta\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\">\u00a0decaimento beta,<\/a>\u00a0\u00a0mas uma pequena fra\u00e7\u00e3o deles est\u00e1 excitada o suficiente para sofrer\u00a0<strong>\u00a0emiss\u00e3o de n\u00eautrons<\/strong>\u00a0.\u00a0O fato de o n\u00eautron ser produzido atrav\u00e9s desse tipo de decaimento e ocorrer\u00a0<strong>\u00a0ordens de magnitude posteriormente<\/strong>\u00a0\u00a0comparadas \u00e0 emiss\u00e3o dos n\u00eautrons imediatos desempenha um papel extremamente importante no controle do reator.<\/li>\n<\/ul>\n<h2>Espectro de n\u00eautrons de fiss\u00e3o<\/h2>\n<h3><span id=\"Region_of_Fast_Neutrons\">Regi\u00e3o de N\u00eautrons R\u00e1pidos<\/span><\/h3>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thermal-reactor-spectrum-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-13564 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thermal-reactor-spectrum-min-300x188.png\" alt=\"Espectro de n\u00eautrons de reator t\u00e9rmico\" width=\"300\" height=\"188\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thermal-reactor-spectrum-min-300x188.png\" \/><\/a>A primeira parte do\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-flux-spectra\/\"><strong>espectro de fluxo de n\u00eautrons<\/strong><\/a>\u00a0\u00a0nos reatores t\u00e9rmicos \u00e9 a\u00a0\u00a0<strong>regi\u00e3o dos n\u00eautrons r\u00e1pidos<\/strong>\u00a0.\u00a0Todos os n\u00eautrons produzidos pela fiss\u00e3o nascem como\u00a0\u00a0<strong>n\u00eautrons r\u00e1pidos<\/strong>\u00a0\u00a0com alta energia cin\u00e9tica.<\/p>\n<p>A princ\u00edpio, precisamos distinguir entre\u00a0\u00a0<strong>n\u00eautrons r\u00e1pidos<\/strong>\u00a0\u00a0e\u00a0\u00a0<a title=\"N\u00eautrons Prompt\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/prompt-neutrons\/\">n\u00eautrons imediatos<\/a>\u00a0.\u00a0\u00c0s vezes, os n\u00eautrons imediatos podem ser\u00a0\u00a0confundidos\u00a0<strong>\u00a0incorretamente<\/strong>\u00a0com os n\u00eautrons r\u00e1pidos.\u00a0Mas h\u00e1 uma diferen\u00e7a essencial entre eles.\u00a0<strong>\u00a0N\u00eautrons r\u00e1pidos<\/strong>\u00a0\u00a0s\u00e3o n\u00eautrons categorizados de acordo com a\u00a0\u00a0<strong>energia cin\u00e9tica<\/strong>\u00a0, enquanto que os\u00a0<strong>\u00a0n\u00eautrons r\u00e1pidos<\/strong>\u00a0\u00a0s\u00e3o categorizados de acordo com o\u00a0<strong>\u00a0tempo de sua libera\u00e7\u00e3o<\/strong>\u00a0.<\/p>\n<p>A maioria dos\u00a0\u00a0<a title=\"N\u00eautron\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\">n\u00eautrons<\/a>\u00a0\u00a0produzidos na fiss\u00e3o s\u00e3o n\u00eautrons r\u00e1pidos.\u00a0Geralmente,\u00a0\u00a0<strong>mais de 99%<\/strong>\u00a0\u00a0dos n\u00eautrons de fiss\u00e3o s\u00e3o os n\u00eautrons imediatos, mas a fra\u00e7\u00e3o exata depende do nucl\u00eddeo a ser fissionado e tamb\u00e9m depende de uma\u00a0<a title=\"Energia de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/neutron-energy\/\">energia<\/a>\u00a0incidente de\u00a0\u00a0<a title=\"Energia de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/neutron-energy\/\">n\u00eautrons\u00a0<\/a>\u00a0(geralmente aumenta com a energia).\u00a0Por exemplo, uma fiss\u00e3o de\u00a0\u00a0<a title=\"Ur\u00e2nio 235\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-235\/\"><sup>235<\/sup>\u00a0U<\/a>\u00a0\u00a0por n\u00eautron t\u00e9rmico produz\u00a0\u00a0<strong>2,43 n\u00eautrons<\/strong>\u00a0, dos quais\u00a0\u00a0<strong>2,42 n\u00eautrons s\u00e3o os n\u00eautrons imediatos<\/strong>\u00a0\u00a0e 0,01585 n\u00eautrons\u00a0\u00a0<strong>(0,01585 \/ 2,43 = 0,0065 = \u00df)<\/strong>\u00a0\u00a0s\u00e3o\u00a0\u00a0<a title=\"N\u00eautrons atrasados\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/delayed-neutrons\/\"><strong>os n\u00eautrons atrasados<\/strong><\/a>\u00a0.<\/p>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Prompt-Neutron-Energy-Spectra-nuclides.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-12817 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/delta-E-E-Telescope-chart-300x200.png\" alt=\"Espectros de energia de n\u00eautrons imediatos - Depend\u00eancia do n\u00facleo de fiss\u00e3o.\" width=\"300\" height=\"202\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/delta-E-E-Telescope-chart-300x200.png\" \/><\/a>A grande quantidade de n\u00eautrons imediatos e at\u00e9 os n\u00eautrons atrasados \u200b\u200bnascem como n\u00eautrons r\u00e1pidos (ou seja, com energia cin\u00e9tica superior a&gt; 1 keV).\u00a0Mas esses dois grupos de\u00a0<strong>n\u00eautrons<\/strong>\u00a0de\u00a0<strong>fiss\u00e3o<\/strong>\u00a0t\u00eam espectros de energia diferentes, portanto, eles contribuem para o espectro de fiss\u00e3o de maneira diferente.\u00a0Como\u00a0\u00a0<strong>mais de 99%<\/strong>\u00a0\u00a0dos n\u00eautrons de fiss\u00e3o s\u00e3o os n\u00eautrons imediatos, \u00e9 \u00f3bvio que eles dominar\u00e3o todo o espectro.<\/p>\n<p><span>Portanto, o espectro r\u00e1pido de n\u00eautrons pode ser descrito pelos seguintes pontos:<\/span><\/p>\n<ul>\n<li><span>Quase todos os n\u00eautrons de fiss\u00e3o t\u00eam\u00a0\u00a0<\/span><strong><span>energias entre 0,1 MeV e 10 MeV<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>A energia m\u00e9dia de n\u00eautrons \u00e9 de cerca de\u00a0<\/span><strong><span>\u00a02 MeV<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>A energia de n\u00eautrons mais prov\u00e1vel \u00e9 de cerca de\u00a0<\/span><strong><span>\u00a00,7 MeV<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<\/ul>\n<p><span>O espectro r\u00e1pido de n\u00eautrons pode ser aproximado pela seguinte distribui\u00e7\u00e3o (normalizada para uma):<\/span><\/p>\n<p><img src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Fast-neutrons-flux-distribution.png\" \/><\/p>\n<p><span>Os n\u00eautrons liberados durante a fiss\u00e3o com uma energia m\u00e9dia de\u00a0\u00a0<\/span><strong><span>2 MeV<\/span><\/strong><span>\u00a0\u00a0em um reator sofrem, em m\u00e9dia,\u00a0\u00a0<\/span><strong><span>v\u00e1rias colis\u00f5es<\/span><\/strong><span>\u00a0\u00a0(\u00a0<\/span><a title=\"Dispers\u00e3o El\u00e1stica de N\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-elastic-scattering\/\"><span>el\u00e1sticas<\/span><\/a><span>\u00a0\u00a0ou\u00a0\u00a0<\/span><a title=\"Dispers\u00e3o Inel\u00e1stica por N\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-inelastic-scattering\/\"><span>inel\u00e1sticas<\/span><\/a><span>\u00a0) antes de serem absorvidos.\u00a0Como resultado dessas colis\u00f5es,\u00a0<\/span><strong><span>\u00a0eles perdem energia<\/span><\/strong><span>\u00a0, de modo que o\u00a0<\/span><strong><span>espectro<\/span><\/strong><span>\u00a0do\u00a0\u00a0<strong>reator n\u00e3o \u00e9 id\u00eantico ao espectro de fiss\u00e3o<\/strong>\u00a0, \u00e9 sempre\u00a0\u00a0<\/span><strong><span>&#8216;mais suave&#8217;<\/span><\/strong><span>\u00a0\u00a0que o espectro de fiss\u00e3o.\u00a0O fato \u00e9 que o espectro de fiss\u00e3o \u00e9 a parte do espectro do reator.<\/span><\/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>Os n\u00eautrons de fiss\u00e3o s\u00e3o n\u00eautrons produzidos na fiss\u00e3o nuclear.\u00a0Eles t\u00eam espectro t\u00edpico e sabe-se que os n\u00eautrons de fiss\u00e3o s\u00e3o importantes em qualquer sistema de rea\u00e7\u00e3o em cadeia.\u00a0Dosimetria de Radia\u00e7\u00e3o Os n\u00eautrons de fiss\u00e3o\u00a0s\u00e3o n\u00eautrons produzidos na\u00a0fiss\u00e3o nuclear\u00a0.\u00a0Eles t\u00eam espectro t\u00edpico e sabe-se que os\u00a0n\u00eautrons de fiss\u00e3o\u00a0s\u00e3o importantes em qualquer sistema de rea\u00e7\u00e3o em &#8230; <a title=\"O que \u00e9 n\u00eautron de fiss\u00e3o &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-neutron-de-fissao-definicao\/\" aria-label=\"More on O que \u00e9 n\u00eautron de fiss\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 n\u00eautron de fiss\u00e3o - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Os n\u00eautrons de fiss\u00e3o s\u00e3o n\u00eautrons produzidos na fiss\u00e3o nuclear. 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