{"id":21968,"date":"2020-07-23T06:57:17","date_gmt":"2020-07-23T06:57:17","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-fator-de-ponderacao-por-radiacao-definicao\/"},"modified":"2020-07-23T06:57:17","modified_gmt":"2020-07-23T06:57:17","slug":"o-que-e-fator-de-ponderacao-por-radiacao-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-fator-de-ponderacao-por-radiacao-definicao\/","title":{"rendered":"O que \u00e9 fator de pondera\u00e7\u00e3o por radia\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\">Na prote\u00e7\u00e3o contra radia\u00e7\u00e3o, o fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o \u00e9 um fator adimensional usado para determinar a dose equivalente da dose absorvida m\u00e9dia sobre um tecido ou \u00f3rg\u00e3o e baseia-se no tipo de radia\u00e7\u00e3o absorvida.\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><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25310 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP-300x159.png\" alt=\"Fatores de pondera\u00e7\u00e3o por radia\u00e7\u00e3o - corrente - ICRP\" width=\"300\" height=\"159\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP-300x159.png\" \/><\/a>Dose equivalente<\/strong>\u00a0(s\u00edmbolo\u00a0<strong>H\u00a0<sub>T<\/sub>\u00a0)<\/strong>\u00a0\u00e9 uma quantidade de dose calculada para \u00f3rg\u00e3os individuais (\u00edndice T &#8211; tecido).\u00a0<strong>A dose equivalente<\/strong>\u00a0\u00e9 baseada na dose absorvida para um \u00f3rg\u00e3o, ajustada para levar em conta a\u00a0<strong>efic\u00e1cia do tipo de radia\u00e7\u00e3o<\/strong>\u00a0.\u00a0Dose equivalente \u00e9 dada a s\u00edmbolo H\u00a0<sub>t<\/sub>\u00a0.\u00a0A unidade SI de\u00a0<strong>H\u00a0<sub>t<\/sub><\/strong>\u00a0\u00e9 o\u00a0<strong>Sievert<\/strong>\u00a0(Sv) ou mas REM (homem equivalente roentgen) ainda \u00e9 vulgarmente utilizado (\u00a0<strong>1 Sv = 100 REM<\/strong>\u00a0).\u00a0A unidade de sievert recebeu o nome do cientista sueco Rolf Sievert, que fez grande parte dos primeiros trabalhos sobre dosimetria em radioterapia.<\/p>\n<p>Como foi escrito, para\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/\">protec\u00e7\u00e3o contra a radia\u00e7\u00e3o<\/a>\u00a0fins, a dose absorvida \u00e9 calculada a m\u00e9dia ao longo de um \u00f3rg\u00e3o ou tecido, T, e esta absorvida m\u00e9dia dose \u00e9 ponderado para a qualidade de radia\u00e7\u00e3o em termos do\u00a0<strong>factor de pondera\u00e7\u00e3o da radia\u00e7\u00e3o<\/strong>\u00a0, W\u00a0<sub>R<\/sub>\u00a0, para o tipo e a energia de incidente de radia\u00e7\u00e3o no corpo.\u00a0O\u00a0<strong>fator de pondera\u00e7\u00e3o da radia\u00e7\u00e3o<\/strong>\u00a0\u00e9 um fator adimensional usado para determinar a dose equivalente da dose absorvida m\u00e9dia sobre um tecido ou \u00f3rg\u00e3o e baseia-se no tipo de radia\u00e7\u00e3o absorvida.\u00a0A dose ponderada resultante foi designada como a dose equivalente de \u00f3rg\u00e3o ou tecido:<\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-equation-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25373 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-equation-definition.png\" alt=\"dose equivalente - equa\u00e7\u00e3o - defini\u00e7\u00e3o\" width=\"444\" height=\"159\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-equation-definition.png\" \/><\/a><\/p>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-definition-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25395 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-definition-min-300x267.png\" alt=\"dose equivalente - defini\u00e7\u00e3o\" width=\"300\" height=\"267\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-definition-min-300x267.png\" \/><\/a><\/p>\n<h2>De Dose Absorvida a Dose Equivalente<\/h2>\n<p>Observe que o\u00a0<strong>sievert n\u00e3o \u00e9 uma unidade de dose f\u00edsica<\/strong>\u00a0.\u00a0Por exemplo, uma dose absorvida de 1 Gy por part\u00edculas alfa levar\u00e1 a uma dose equivalente a 20 Sv.\u00a0Isso pode parecer um paradoxo.\u00a0Isso implica que a energia do campo de radia\u00e7\u00e3o incidente em joules aumentou em um fator de 20, violando as leis de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/\">conserva\u00e7\u00e3o de energia<\/a>\u00a0.\u00a0No entanto, este n\u00e3o \u00e9 o caso.\u00a0Sievert \u00e9 derivado da dose f\u00edsica absorvida em quantidade, mas tamb\u00e9m leva em considera\u00e7\u00e3o a\u00a0<strong>efic\u00e1cia biol\u00f3gica<\/strong>\u00a0da radia\u00e7\u00e3o, que depende do tipo e energia da radia\u00e7\u00e3o.\u00a0O\u00a0<strong>fator de pondera\u00e7\u00e3o da radia\u00e7\u00e3o<\/strong>\u00a0faz com que o crivo n\u00e3o possa ser uma unidade f\u00edsica.<\/p>\n<p>Como foi escrito, cada tipo de radia\u00e7\u00e3o\u00a0<strong>interage com a mat\u00e9ria de uma maneira diferente<\/strong>\u00a0e causa diferentes danos biol\u00f3gicos.\u00a0Por exemplo, part\u00edculas carregadas com altas energias podem ionizar diretamente \u00e1tomos.\u00a0Por outro lado, part\u00edculas eletricamente neutras interagem apenas indiretamente, mas tamb\u00e9m podem transferir parte ou todas as suas energias para o assunto.\u00a0Certamente simplificaria as coisas se\u00a0<strong>os efeitos biol\u00f3gicos<\/strong>radia\u00e7\u00e3o foram diretamente proporcionais \u00e0 dose absorvida.\u00a0Infelizmente, os efeitos biol\u00f3gicos dependem tamb\u00e9m da maneira como a dose absorvida \u00e9 distribu\u00edda ao longo do caminho da radia\u00e7\u00e3o.\u00a0Estudos demonstraram que a radia\u00e7\u00e3o alfa e n\u00eautron causa maior dano biol\u00f3gico para uma dada deposi\u00e7\u00e3o de energia por kg de tecido do que a radia\u00e7\u00e3o gama.\u00a0Foi descoberto que os efeitos biol\u00f3gicos de qualquer radia\u00e7\u00e3o\u00a0<strong>aumentam<\/strong>\u00a0com a\u00a0<strong>transfer\u00eancia linear de energia<\/strong>\u00a0(LET).\u00a0Em suma, o dano biol\u00f3gico da\u00a0<strong>radia\u00e7\u00e3o<\/strong>\u00a0de\u00a0<strong>alta LET<\/strong>\u00a0(\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\">part\u00edculas alfa<\/a>\u00a0,\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/what-is-proton-properties-of-proton\/\">pr\u00f3tons<\/a>\u00a0ou\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\">n\u00eautrons<\/a>\u00a0) \u00e9 muito maior do que o da\u00a0<strong>radia\u00e7\u00e3o<\/strong>\u00a0de\u00a0<strong>baixa LET<\/strong>\u00a0(\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">raios gama<\/a>)\u00a0Isso ocorre porque o tecido vivo pode reparar mais facilmente os danos causados \u200b\u200bpela radia\u00e7\u00e3o que se espalha por uma \u00e1rea grande do que aquela que est\u00e1 concentrada em uma \u00e1rea pequena.\u00a0Como mais danos biol\u00f3gicos s\u00e3o causados \u200b\u200bpela mesma dose f\u00edsica (ou seja, a mesma energia depositada por unidade de massa de tecido), um cinza da radia\u00e7\u00e3o alfa ou n\u00eautron \u00e9 mais prejudicial do que um cinza da radia\u00e7\u00e3o gama.\u00a0Este fato de que radia\u00e7\u00f5es de diferentes tipos (e energias) produzem efeitos biol\u00f3gicos diferentes para a mesma dose absorvida \u00e9 descrito em termos de fatores conhecidos como\u00a0<strong>efetividade biol\u00f3gica relativa<\/strong>\u00a0(RBE) e\u00a0<strong>fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o<\/strong>\u00a0(w\u00a0<sub>R<\/sub>\u00a0).<\/p>\n<h3>Fator de Pondera\u00e7\u00e3o de Radia\u00e7\u00e3o<\/h3>\n<p>Na prote\u00e7\u00e3o contra radia\u00e7\u00e3o, o\u00a0<strong>fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o<\/strong>\u00a0\u00e9 um fator adimensional usado para determinar a dose equivalente da dose absorvida m\u00e9dia sobre um tecido ou \u00f3rg\u00e3o e baseia-se no tipo de radia\u00e7\u00e3o absorvida.\u00a0No passado, um fator semelhante, conhecido como\u00a0<strong>fator de qualidade,<\/strong>\u00a0era usado para esse fim.\u00a0O\u00a0<strong>fator de pondera\u00e7\u00e3o da radia\u00e7\u00e3o<\/strong>\u00a0\u00e9 uma estimativa da efic\u00e1cia por dose unit\u00e1ria da radia\u00e7\u00e3o fornecida em rela\u00e7\u00e3o ao padr\u00e3o de baixa LET.<\/p>\n<p>Antes de 1990, quantidades equivalentes \u00e0 dose eram definidas em termos de um fator de qualidade, Q (L), aplicado \u00e0 dose absorvida em um ponto, a fim de levar em considera\u00e7\u00e3o as diferen\u00e7as nos efeitos de diferentes tipos de radia\u00e7\u00e3o.\u00a0Nas suas recomenda\u00e7\u00f5es de 1990, o ICRP introduziu um conceito modificado.\u00a0Para fins de protec\u00e7\u00e3o contra as radia\u00e7\u00f5es, a dose absorvida \u00e9 calculada a m\u00e9dia ao longo de um \u00f3rg\u00e3o ou tecido, T, e esta absorvida m\u00e9dia dose \u00e9 ponderado para a qualidade de radia\u00e7\u00e3o em termos do factor de pondera\u00e7\u00e3o da radia\u00e7\u00e3o, W\u00a0<sub>R<\/sub>\u00a0, para o tipo e a energia da radia\u00e7\u00e3o incidente sobre o corpo.<\/p>\n<p>O motivo para a substitui\u00e7\u00e3o do factor de qualidade, ou seja, a rela\u00e7\u00e3o Q-G, com w\u00a0<sub>R<\/sub>\u00a0valores na defini\u00e7\u00e3o das doses de \u00f3rg\u00e3o equivalente e a dose eficaz foi a de que a Comiss\u00e3o Acredita:<\/p>\n<p><em>&#8216;que o detalhe e a precis\u00e3o inerentes ao uso de uma rela\u00e7\u00e3o Q-L formal para modificar a dose absorvida para refletir a maior probabilidade de preju\u00edzo resultante da exposi\u00e7\u00e3o a componentes de radia\u00e7\u00e3o com alta LET n\u00e3o se justificam devido \u00e0s incertezas nas informa\u00e7\u00f5es radiol\u00f3gicas&#8217;.<\/em><\/p>\n<p>Vale ressaltar que esses dois fatores, o\u00a0<strong>fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o<\/strong>\u00a0e o\u00a0<strong>fator de qualidade,<\/strong>\u00a0est\u00e3o restritos \u00e0 faixa de dose de interesse para a prote\u00e7\u00e3o contra radia\u00e7\u00e3o, ou seja, \u00e0 magnitude geral dos limites de dose.\u00a0Em circunst\u00e2ncias especiais em que se lida com doses mais altas que podem causar efeitos determin\u00edsticos, os valores relevantes de RBE s\u00e3o aplicados para obter uma dose ponderada.<\/p>\n<p><strong>Refer\u00eancia Especial<\/strong>\u00a0: ICRP, 2003. Efic\u00e1cia Biol\u00f3gica Relativa (RBE), Fator de Qualidade (\u00a0<em>Q<\/em>\u00a0) e Fator de Pondera\u00e7\u00e3o de Radia\u00e7\u00e3o (\u00a0<em>w\u00a0<\/em><sub>R<\/sub>\u00a0).\u00a0Publica\u00e7\u00e3o ICRP 92. Ann.\u00a0ICRP 33 (4).<\/p>\n<h3><span>Fatores de pondera\u00e7\u00e3o por radia\u00e7\u00e3o &#8211; ICRP<\/span><\/h3>\n<p><span>Para radia\u00e7\u00e3o de f\u00f3ton e el\u00e9tron, o\u00a0<\/span><strong><span>fator de pondera\u00e7\u00e3o<\/span><\/strong><span>\u00a0da\u00a0<strong>radia\u00e7\u00e3o<\/strong>\u00a0tem o valor 1 independentemente da energia da radia\u00e7\u00e3o e para a radia\u00e7\u00e3o alfa o valor 20. Para a radia\u00e7\u00e3o de n\u00eautrons, o valor depende da energia e atinge de 5 a 20.<\/span><\/p>\n<figure id=\"attachment_25306\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-25306\"><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-ICRP.png\"><img loading=\"lazy\" class=\"size-full wp-image-25306 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-ICRP.png\" alt=\"Fatores de pondera\u00e7\u00e3o de radia\u00e7\u00e3o\" width=\"555\" height=\"245\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-ICRP.png\" \/><\/a><figcaption id=\"caption-attachment-25306\" class=\"wp-caption-text\"><span>Fonte: ICRP, 2003. Efetividade biol\u00f3gica relativa (RBE), fator de qualidade (Q) e fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o (wR).\u00a0Publica\u00e7\u00e3o ICRP 92. Ann.\u00a0ICRP 33 (4).<\/span><\/figcaption><\/figure>\n<p><span>Em 2007, o ICRP publicou um\u00a0<\/span><strong><span>novo conjunto de fatores de pondera\u00e7\u00e3o de radia\u00e7\u00e3o<\/span><\/strong><span>\u00a0(ICRP Publ. 103: As Recomenda\u00e7\u00f5es de 2007 da Comiss\u00e3o Internacional de Prote\u00e7\u00e3o Radiol\u00f3gica).\u00a0Esses fatores s\u00e3o apresentados abaixo.<\/span><\/p>\n<figure id=\"attachment_25310\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-25310\"><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP.png\"><img loading=\"lazy\" class=\"size-full wp-image-25310 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP.png\" alt=\"Fatores de pondera\u00e7\u00e3o por radia\u00e7\u00e3o - corrente - ICRP\" width=\"560\" height=\"296\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP.png\" \/><\/a><figcaption id=\"caption-attachment-25310\" class=\"wp-caption-text\"><span>Fonte: ICRP, 2007. Publ.\u00a0103: As recomenda\u00e7\u00f5es de 2007 da Comiss\u00e3o Internacional de Prote\u00e7\u00e3o Radiol\u00f3gica.<\/span><\/figcaption><\/figure>\n<p><span>Como mostrado na tabela, aw\u00a0<\/span><sub><span>R<\/span><\/sub><span>\u00a0de 1 \u00e9 para todas as radia\u00e7\u00f5es de baixa LET, ou seja, raios X e raios gama de todas as energias, bem como el\u00e9trons e m\u00faons.\u00a0Uma curva suave, considerada uma aproxima\u00e7\u00e3o, foi ajustada aos w\u00a0<\/span><sub><span>R<\/span><\/sub><span>\u00a0valores como uma fun\u00e7\u00e3o da energia incidente de neutr\u00f5es.\u00a0Note que E\u00a0<\/span><sub><span>n<\/span><\/sub><span>\u00a0\u00e9 a energia de n\u00eautrons em MeV.<\/span><\/p>\n<figure id=\"attachment_25384\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-25384\"><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radiation-weighting-factor-neutrons-ICRP.png\"><img loading=\"lazy\" class=\"size-full wp-image-25384 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radiation-weighting-factor-neutrons-ICRP.png\" alt=\"fator de pondera\u00e7\u00e3o por radia\u00e7\u00e3o - n\u00eautrons - ICRP\" width=\"527\" height=\"339\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radiation-weighting-factor-neutrons-ICRP.png\" \/><\/a><figcaption id=\"caption-attachment-25384\" class=\"wp-caption-text\"><span>O fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o wR para n\u00eautrons introduzido na Publica\u00e7\u00e3o 60 (ICRP, 1991) como uma fun\u00e7\u00e3o descont\u00ednua da energia de n\u00eautrons (- &#8211; -) e a modifica\u00e7\u00e3o proposta (-).<\/span><\/figcaption><\/figure>\n<p><span>Assim, por exemplo, uma dose absorvida de 1 Gy por part\u00edculas alfa levar\u00e1 a uma dose equivalente a 20 Sv, e estima-se que uma dose equivalente de radia\u00e7\u00e3o tenha o mesmo efeito biol\u00f3gico que uma quantidade igual de dose absorvida de raios gama, que \u00e9 dado um fator de pondera\u00e7\u00e3o de 1.<\/span><\/p>\n<h3><span>Fator de qualidade<\/span><\/h3>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/quality-factor-radiation.png\"><img loading=\"lazy\" class=\"alignright size-full wp-image-25308 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/quality-factor-radiation.png\" alt=\"fator de qualidade - radia\u00e7\u00e3o\" width=\"381\" height=\"162\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/quality-factor-radiation.png\" \/><\/a><span>O\u00a0<\/span><strong><span>fator<\/span><\/strong><span>\u00a0de\u00a0<strong>qualidade<\/strong>\u00a0de um tipo de radia\u00e7\u00e3o \u00e9 definido como a raz\u00e3o entre o dano biol\u00f3gico produzido pela absor\u00e7\u00e3o de 1 Gy dessa radia\u00e7\u00e3o e o dano biol\u00f3gico produzido por 1 Gy de raios-X ou raios gama.<\/span><\/p>\n<p><span>O Q de um certo tipo de radia\u00e7\u00e3o est\u00e1 relacionado \u00e0 densidade dos rastros de \u00edons que ele deixa para tr\u00e1s nos tecidos.\u00a0Os fatores de qualidade para os v\u00e1rios tipos de radia\u00e7\u00e3o est\u00e3o listados na tabela.<\/span><\/p>\n<p><span>Esses\u00a0<\/span><strong><span>fatores de qualidade<\/span><\/strong><span>\u00a0s\u00e3o restritos \u00e0 faixa de dose de interesse para a prote\u00e7\u00e3o contra radia\u00e7\u00e3o, ou seja, \u00e0 magnitude geral dos limites de dose.\u00a0Em circunst\u00e2ncias especiais em que se lida com doses mais altas que podem causar efeitos determin\u00edsticos, os valores relevantes de RBE s\u00e3o aplicados para obter uma dose ponderada.<\/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>Na prote\u00e7\u00e3o contra radia\u00e7\u00e3o, o fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o \u00e9 um fator adimensional usado para determinar a dose equivalente da dose absorvida m\u00e9dia sobre um tecido ou \u00f3rg\u00e3o e baseia-se no tipo de radia\u00e7\u00e3o absorvida.\u00a0Dosimetria de Radia\u00e7\u00e3o Dose equivalente\u00a0(s\u00edmbolo\u00a0H\u00a0T\u00a0)\u00a0\u00e9 uma quantidade de dose calculada para \u00f3rg\u00e3os individuais (\u00edndice T &#8211; tecido).\u00a0A dose equivalente\u00a0\u00e9 baseada &#8230; <a title=\"O que \u00e9 fator de pondera\u00e7\u00e3o por radia\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-fator-de-ponderacao-por-radiacao-definicao\/\" aria-label=\"More on O que \u00e9 fator de pondera\u00e7\u00e3o por radia\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 fator de pondera\u00e7\u00e3o por radia\u00e7\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Na prote\u00e7\u00e3o contra radia\u00e7\u00e3o, o fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o \u00e9 um fator adimensional usado para determinar a dose equivalente da dose absorvida m\u00e9dia sobre um tecido ou \u00f3rg\u00e3o e \u00e9 baseado no tipo de radia\u00e7\u00e3o absorvida. 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