{"id":21974,"date":"2020-07-23T07:11:14","date_gmt":"2020-07-23T07:11:14","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/"},"modified":"2020-07-23T07:16:58","modified_gmt":"2020-07-23T07:16:58","slug":"o-que-e-sievert-grey-becquerel-conversao-calculo-definicao","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/","title":{"rendered":"O que \u00e9 Sievert &#8211; Grey &#8211; Becquerel &#8211; Convers\u00e3o &#8211; C\u00e1lculo &#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\">Mas qual \u00e9 a rela\u00e7\u00e3o entre becquerels (radioatividade), cinzas (dose absorvida) e sieverts (dose equivalente)?\u00a0Este artigo mostra como converter e calcular essas quantidades.\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><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/sievert-radiation-definition-definition-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25394 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/sievert-radiation-definition-definition-min-300x267.png\" alt=\"sievert - radia\u00e7\u00e3o\" width=\"300\" height=\"267\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/sievert-radiation-definition-definition-min-300x267.png\" \/><\/a>Na prote\u00e7\u00e3o contra radia\u00e7\u00e3o, o\u00a0<strong>sievert<\/strong>\u00a0\u00e9 uma unidade derivada de\u00a0<strong>dose equivalente<\/strong>\u00a0e\u00a0<strong>dose efetiva.\u00a0<\/strong>O sievert representa o efeito biol\u00f3gico equivalente ao dep\u00f3sito de um joule de energia de raios gama em um quilograma de tecido humano.\u00a0Mas qual \u00e9 a rela\u00e7\u00e3o entre becquerels (radioatividade) e sieverts (dose equivalente)?<\/p>\n<p>Nos cap\u00edtulos anteriores, discutimos a\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/radioactivity-nuclear-decay\/\"><strong>radioatividade<\/strong><\/a>\u00a0e a intensidade de uma fonte radioativa, medida geralmente em\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/units-of-radioactivity\/becquerel-unit-of-radioactivity\/\">becquerels<\/a>\u00a0.\u00a0Mas qualquer fonte radioativa\u00a0<b>n\u00e3o\u00a0<\/b>representa\u00a0<b>risco biol\u00f3gico\u00a0<\/b>, desde que isolada do ambiente.\u00a0No entanto, quando pessoas ou outro sistema (tamb\u00e9m n\u00e3o biol\u00f3gico) s\u00e3o expostos \u00e0 radia\u00e7\u00e3o, a energia \u00e9 depositada no material e a dose de radia\u00e7\u00e3o \u00e9 fornecida.<\/p>\n<p>Portanto, \u00e9 muito importante distinguir entre a radioatividade de uma fonte radioativa e a\u00a0<strong>dose de radia\u00e7\u00e3o<\/strong>\u00a0que pode resultar da fonte.\u00a0Geralmente, a dose de radia\u00e7\u00e3o depende dos seguintes fatores em rela\u00e7\u00e3o \u00e0 fonte radioativa:<\/p>\n<ul>\n<li><b>Atividade.\u00a0<\/b>A atividade da fonte influencia diretamente a dose de radia\u00e7\u00e3o depositada no material.<\/li>\n<li><b>Tipo de radia\u00e7\u00e3o\u00a0<\/b>.\u00a0Cada tipo de radia\u00e7\u00e3o\u00a0<b>interage com a mat\u00e9ria de uma maneira diferente\u00a0<\/b>.\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.<\/li>\n<li><b>Dist\u00e2ncia.\u00a0<\/b>A quantidade de exposi\u00e7\u00e3o \u00e0 radia\u00e7\u00e3o depende da dist\u00e2ncia da fonte de radia\u00e7\u00e3o.\u00a0Da mesma forma que o calor de um inc\u00eandio, se voc\u00ea estiver muito pr\u00f3ximo, a intensidade da radia\u00e7\u00e3o de calor \u00e9 alta e voc\u00ea pode se queimar.\u00a0Se voc\u00ea estiver na dist\u00e2ncia certa, voc\u00ea pode suportar sem problemas e, al\u00e9m disso, \u00e9 confort\u00e1vel.\u00a0Se voc\u00ea estiver muito longe da fonte de calor, a insufici\u00eancia de calor tamb\u00e9m poder\u00e1 prejudic\u00e1-lo.\u00a0Essa analogia, em certo sentido, pode ser aplicada \u00e0 radia\u00e7\u00e3o tamb\u00e9m de fontes de radia\u00e7\u00e3o.<\/li>\n<li><b>Tempo.\u00a0<\/b>A quantidade de exposi\u00e7\u00e3o \u00e0 radia\u00e7\u00e3o depende diretamente (linearmente)\u00a0<b>do tempo que as\u00a0<\/b>pessoas passam perto da fonte de radia\u00e7\u00e3o.<\/li>\n<li><b>Blindagem.\u00a0<\/b>Finalmente, a dose de radia\u00e7\u00e3o tamb\u00e9m depende do material entre a fonte e o objeto.\u00a0Se a fonte for muito intensa e o tempo ou a dist\u00e2ncia n\u00e3o fornecerem prote\u00e7\u00e3o suficiente contra radia\u00e7\u00e3o, a blindagem poder\u00e1 ser usada.<\/li>\n<\/ul>\n<p>O perigo de radia\u00e7\u00e3o ionizante reside no fato de que a radia\u00e7\u00e3o \u00e9 invis\u00edvel e n\u00e3o diretamente detect\u00e1vel pelos sentidos humanos.\u00a0As pessoas n\u00e3o podem ver nem sentir radia\u00e7\u00e3o, mas ela deposita energia nas mol\u00e9culas do corpo.\u00a0A energia \u00e9 transferida em pequenas quantidades para cada intera\u00e7\u00e3o entre a radia\u00e7\u00e3o e uma mol\u00e9cula e geralmente existem muitas dessas intera\u00e7\u00f5es.<\/p>\n<h2>Sievert e Gray<\/h2>\n<p><strong>Dose absorvida<\/strong>\u00a0\u00e9 definida como a quantidade de energia depositada pela radia\u00e7\u00e3o ionizante em uma subst\u00e2ncia.\u00a0<strong>Dose absorvida<\/strong>\u00a0\u00e9 dado o s\u00edmbolo\u00a0<strong>D<\/strong>\u00a0.\u00a0A dose absorvida \u00e9 geralmente medida em uma unidade chamada\u00a0<strong>cinza<\/strong>\u00a0(Gy), que \u00e9 derivada do sistema SI.\u00a0\u00c0s vezes, a\u00a0unidade n\u00e3o-SI\u00a0<strong>rad<\/strong>\u00a0tamb\u00e9m \u00e9 usada, predominantemente nos EUA.<\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25307 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-definition.png\" alt=\"dose absorvida - defini\u00e7\u00e3o\" width=\"180\" height=\"72\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-definition.png\" \/><\/a><\/p>\n<p><span>Para\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/\"><span>protec\u00e7\u00e3o contra as radia\u00e7\u00f5es<\/span><\/a><span>\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<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/equivalent-dose\/radiation-weighting-factor\/\"><strong><span>factor de pondera\u00e7\u00e3o da radia\u00e7\u00e3o<\/span><\/strong><\/a><span>\u00a0, W\u00a0<\/span><sub><span>R<\/span><\/sub><span>\u00a0, para o tipo e a energia da radia\u00e7\u00e3o incidente sobre o corpo.\u00a0O\u00a0<\/span><strong><span>fator de pondera\u00e7\u00e3o da radia\u00e7\u00e3o<\/span><\/strong><span>\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:<\/span><\/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<figure id=\"attachment_25310\" class=\"wp-caption alignright\" 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-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><figcaption id=\"caption-attachment-25310\" class=\"wp-caption-text\"><span>Tabela de fatores de pondera\u00e7\u00e3o da radia\u00e7\u00e3o.\u00a0Fonte: ICRP Publ.\u00a0103: As recomenda\u00e7\u00f5es de 2007 da Comiss\u00e3o Internacional de Prote\u00e7\u00e3o Radiol\u00f3gica<\/span><\/figcaption><\/figure>\n<p><span>Uma dose equivalente de\u00a0<\/span><strong><span>um Sievert<\/span><\/strong><span>\u00a0representa a quantidade de dose de radia\u00e7\u00e3o equivalente, em termos de\u00a0<\/span><strong><span>dano biol\u00f3gico<\/span><\/strong><span>\u00a0especificado\u00a0, a\u00a0<\/span><a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-gray-unidade-de-dose-de-radiacao-definicao\/\"><strong><span>um cinza<\/span><\/strong><\/a><span>\u00a0de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/x-rays-roentgen-radiation\/\"><span>raios X<\/span><\/a><span>\u00a0ou\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\"><span>raios gama<\/span><\/a><span>\u00a0.\u00a0Uma dose de\u00a0<\/span><strong><span>um Sv<\/span><\/strong><span>\u00a0causada pela radia\u00e7\u00e3o gama \u00e9 equivalente a uma deposi\u00e7\u00e3o de energia de um joule em um quilograma de tecido.\u00a0Isso significa que um sievert \u00e9 equivalente a um cinza de raios gama depositados em certos tecidos.\u00a0Por outro lado, danos biol\u00f3gica semelhante (uma Sievert) pode ser causado apenas por 1\/20 cinza de alfa radia\u00e7\u00e3o (devido \u00e0 alta W\u00a0<\/span><sub><span>R<\/span><\/sub><span>\u00a0de alfa radia\u00e7\u00e3o).\u00a0Portanto, o\u00a0<\/span><strong><span>sievert n\u00e3o \u00e9 uma unidade de dose f\u00edsica<\/span><\/strong><span>.\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<\/span><a href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/\"><span>conserva\u00e7\u00e3o de energia<\/span><\/a><span>\u00a0.\u00a0No entanto, este n\u00e3o \u00e9 o caso.\u00a0Sievert \u00e9 derivado da quantidade f\u00edsica de dose absorvida, mas tamb\u00e9m leva em considera\u00e7\u00e3o a\u00a0<\/span><strong><span>efic\u00e1cia biol\u00f3gica<\/span><\/strong><span>\u00a0da radia\u00e7\u00e3o, que depende do tipo e energia da radia\u00e7\u00e3o.\u00a0O\u00a0<\/span><strong><span>fator de pondera\u00e7\u00e3o da radia\u00e7\u00e3o<\/span><\/strong><span>\u00a0faz com que o crivo n\u00e3o possa ser uma unidade f\u00edsica.<\/span><\/p>\n<p><strong><span>Uma peneira<\/span><\/strong><span>\u00a0\u00e9 uma grande quantidade de dose equivalente.\u00a0Uma pessoa que absorveu uma dose de 1 Sv no corpo inteiro absorveu um joule de energia em cada kg de tecido corporal (no caso de raios gama).<\/span><\/p>\n<p><strong><span>Doses equivalentes<\/span><\/strong><span>\u00a0\u00a0medidas na ind\u00fastria e na medicina geralmente t\u00eam doses mais baixas do que uma peneira, e os seguintes m\u00faltiplos s\u00e3o frequentemente usados:<\/span><\/p>\n<p><strong><span>1 mSv (milissegundo) = 1E-3 Sv<\/span><\/strong><\/p>\n<p><strong><span>1 \u00b5Sv (microsievert) = 1E-6 Sv<\/span><\/strong><\/p>\n<p><span>As convers\u00f5es das unidades SI para outras unidades s\u00e3o as seguintes:<\/span><\/p>\n<ul>\n<li><span>1 Sv = 100 rem<\/span><\/li>\n<li><span>1 mSv = 100 mrem<\/span><\/li>\n<\/ul>\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<p><span>Veja tamb\u00e9m:\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/equivalent-dose\/quality-factor\/\"><span>Fator da qualidade<\/span><\/a><\/p>\n<h2><span>Dose eficaz &#8211; Sieverts<\/span><\/h2>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/tissue-weighting-factor-ICRP.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25461 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/tissue-weighting-factor-ICRP-300x111.png\" alt=\"fator de pondera\u00e7\u00e3o tecidual - ICRP\" width=\"300\" height=\"111\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/tissue-weighting-factor-ICRP-300x111.png\" \/><\/a><span>A dose eficaz \u00e9 uma quantidade de dose definida como a soma das doses de tecido equivalente ponderados pelo \u00f3rg\u00e3o ICRP (tecido) factores de pondera\u00e7\u00e3o, W\u00a0<\/span><sub><span>T<\/span><\/sub><span>\u00a0, que leva em conta a sensibilidade variando de diferentes \u00f3rg\u00e3os e tecidos para a radia\u00e7\u00e3o.<\/span><\/p>\n<p><span>A dose eficaz permite determinar as consequ\u00eancias biol\u00f3gicas da irradia\u00e7\u00e3o parcial (n\u00e3o uniforme) para as consequ\u00eancias da irradia\u00e7\u00e3o completa.\u00a0V\u00e1rios tecidos do corpo reagem \u00e0 radia\u00e7\u00e3o ionizante de diferentes maneiras, de modo que o ICRP atribuiu fatores de sensibilidade a tecidos e \u00f3rg\u00e3os especificados, de modo que o efeito da irradia\u00e7\u00e3o parcial possa ser calculado se as regi\u00f5es irradiadas forem conhecidas.<\/span><\/p>\n<p><span>Na publica\u00e7\u00e3o 60, o ICRP definiu a dose efetiva como a soma duplamente ponderada da dose absorvida em todos os \u00f3rg\u00e3os e tecidos do corpo.\u00a0Os limites de dose s\u00e3o definidos em termos de dose efetiva e aplicam-se ao indiv\u00edduo para fins de prote\u00e7\u00e3o radiol\u00f3gica, incluindo a avalia\u00e7\u00e3o de risco em termos gerais.\u00a0Matematicamente, a dose efetiva pode ser expressa como:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/effective-dose-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25463 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/effective-dose-definition.png\" alt=\"dose eficaz - defini\u00e7\u00e3o\" width=\"460\" height=\"334\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/effective-dose-definition.png\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h2><span>Exemplos de doses em Sieverts<\/span><\/h2>\n<p><span>Devemos notar que a\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/\"><span>radia\u00e7\u00e3o<\/span><\/a><span>\u00a0est\u00e1 \u00e0 nossa volta.\u00a0Dentro, ao redor e acima do mundo em que vivemos. \u00c9 uma for\u00e7a de energia natural que nos rodeia.\u00a0\u00c9 uma parte do nosso mundo natural que est\u00e1 aqui desde o nascimento do nosso planeta.\u00a0Nos pontos a seguir, tentamos expressar enormes faixas de exposi\u00e7\u00e3o \u00e0 radia\u00e7\u00e3o, que podem ser obtidas de v\u00e1rias fontes.<\/span><\/p>\n<ul>\n<li><strong><span>0,05 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Dormindo ao lado de algu\u00e9m<\/span><\/li>\n<li><strong><span>0,09 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Morando a 48 quil\u00f4metros de uma usina nuclear por um ano<\/span><\/li>\n<li><strong><span>0,1 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Comendo uma banana<\/span><\/li>\n<li><strong><span>0,3 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Morando a 80 quil\u00f4metros de uma usina a carv\u00e3o por um ano<\/span><\/li>\n<li><strong><span>10 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Dose di\u00e1ria m\u00e9dia recebida do fundo natural<\/span><\/li>\n<li><strong><span>20 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; radiografia de t\u00f3rax<\/span><\/li>\n<li><strong><span>40 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Um voo de avi\u00e3o de 5 horas<\/span><\/li>\n<li><strong><span>600 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; mamografia<\/span><\/li>\n<li><strong><span>1 000 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Limite de dose para membros individuais do p\u00fablico, dose efetiva total por ano<\/span><\/li>\n<li><strong><span>3 650 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Dose m\u00e9dia anual recebida do fundo natural<\/span><\/li>\n<li><strong><span>5 800 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; tomografia computadorizada do t\u00f3rax<\/span><\/li>\n<li><strong><span>10 000 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Dose m\u00e9dia anual recebida do ambiente natural em Ramsar, Ir\u00e3<\/span><\/li>\n<li><strong><span>20 000 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; tomografia computadorizada de corpo inteiro<\/span><\/li>\n<li><strong><span>175 000 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Dose anual de radia\u00e7\u00e3o natural em uma praia de monazita perto de Guarapari, Brasil.<\/span><\/li>\n<li><strong><span>5 000 000 \u00b5Sv<\/span><\/strong><span>\u00a0&#8211; Dose que mata um ser humano com um risco de 50% dentro de 30 dias (LD50 \/ 30), se a dose for recebida por um per\u00edodo\u00a0<\/span><strong><span>muito curto<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<\/ul>\n<p><span>Como pode ser visto, doses baixas s\u00e3o comuns na vida cotidiana.\u00a0Os exemplos anteriores podem ajudar a ilustrar magnitudes relativas.\u00a0Do ponto de vista das consequ\u00eancias biol\u00f3gicas, \u00e9 muito importante distinguir entre doses recebidas em\u00a0<strong>per\u00edodos\u00a0<\/strong><\/span><strong><span>curtos<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>prolongados<\/span><\/strong><span>\u00a0.\u00a0Uma \u201c\u00a0<\/span><strong><span>dose aguda<\/span><\/strong><span>\u00a0\u201d \u00e9 aquela que ocorre por um per\u00edodo curto e finito de tempo, enquanto uma \u201c\u00a0<strong>dose cr\u00f4nica<\/strong>\u00a0\u201d<\/span><span>\u201d\u00c9 uma dose que continua por um longo per\u00edodo de tempo, para que seja melhor descrita por uma taxa de dose.\u00a0Altas doses tendem a matar c\u00e9lulas, enquanto doses baixas tendem a danific\u00e1-las ou alter\u00e1-las.\u00a0Doses baixas espalhadas por longos per\u00edodos de tempo n\u00e3o causam problemas imediatos a nenhum \u00f3rg\u00e3o do corpo.\u00a0Os efeitos de baixas doses de radia\u00e7\u00e3o ocorrem no n\u00edvel da c\u00e9lula e os resultados podem n\u00e3o ser observados por muitos anos.<\/span><\/p>\n<h2><span>C\u00e1lculo da taxa de dose protegida em Sieverts<\/span><\/h2>\n<p><span>Suponha a\u00a0<\/span><strong><span>fonte isotr\u00f3pica pontual<\/span><\/strong><span>\u00a0que cont\u00e9m\u00a0<\/span><strong><span>1,0 Ci de\u00a0<\/span><sup><span>137<\/span><\/sup><span>\u00a0Cs<\/span><\/strong><span>\u00a0, que tem uma\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/half-life\/\"><span>meia-vida<\/span><\/a><span>\u00a0de\u00a0<\/span><strong><span>30,2 anos<\/span><\/strong><span>\u00a0.\u00a0Observe que a rela\u00e7\u00e3o entre a meia-vida e a quantidade de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/radionuclide-radioisotope\/\"><span>radionucl\u00eddeo<\/span><\/a><span>\u00a0necess\u00e1ria para gerar uma atividade de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/units-of-radioactivity\/curie-unit-of-radioactivity\/\"><span>um curie<\/span><\/a><span>\u00a0\u00e9 mostrada abaixo.\u00a0Essa quantidade de material pode ser calculada usando \u03bb, que \u00e9 a\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\"><span>constante<\/span><\/a><span>\u00a0de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\">decaimento<\/a>\u00a0de determinado nucl\u00eddeo:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-24886 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\" alt=\"Curie - Unidade de Atividade\" width=\"378\" height=\"61\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\" \/><\/a><\/p>\n<p><span>Cerca de 94,6% decai por\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\"><span>emiss\u00e3o beta<\/span><\/a><span>\u00a0em um\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/nuclides\/isomers\/\"><span>is\u00f4mero nuclear<\/span><\/a><span>\u00a0metaest\u00e1vel\u00a0de b\u00e1rio: b\u00e1rio-137m.\u00a0O pico principal de f\u00f3tons de Ba-137m \u00e9\u00a0<\/span><strong><span>662 keV<\/span><\/strong><span>\u00a0.\u00a0Para esse c\u00e1lculo, suponha que todos os decaimentos passem por esse canal.<\/span><\/p>\n<p><strong><span>Calcule a taxa de dose prim\u00e1ria do f\u00f3ton<\/span><\/strong><span>\u00a0, em cinza por hora (Gy.h\u00a0<\/span><sup><span>-1<\/span><\/sup><span>\u00a0), na superf\u00edcie externa de uma blindagem de chumbo de 5 cm de espessura.\u00a0Em seguida,\u00a0<\/span><strong><span>calcule a\u00a0<\/span><\/strong><strong><span>taxa de dose equivalente<\/span><\/strong><span>\u00a0.\u00a0Suponha que esse campo de radia\u00e7\u00e3o externa penetre\u00a0<\/span><strong><span>uniformemente<\/span><\/strong><span>\u00a0por todo o corpo.\u00a0A taxa de dose prim\u00e1ria de f\u00f3tons negligencia todas as part\u00edculas secund\u00e1rias.\u00a0Suponha que a dist\u00e2ncia efetiva da fonte do ponto de dose seja\u00a0<\/span><strong><span>10 cm<\/span><\/strong><span>\u00a0.\u00a0Tamb\u00e9m devemos assumir que o ponto de dose \u00e9 um tecido mole, que pode ser razoavelmente simulado pela \u00e1gua e usamos o coeficiente de absor\u00e7\u00e3o de energia em massa da \u00e1gua.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\"><span>Atenua\u00e7\u00e3o de raios gama<\/span><\/a><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/shielding-of-ionizing-radiation\/shielding-gamma-radiation\/\"><span>Blindagem de raios gama<\/span><\/a><\/p>\n<p><strong><span>Solu\u00e7\u00e3o:<\/span><\/strong><\/p>\n<p><span>A taxa de dose prim\u00e1ria de f\u00f3tons \u00e9\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\"><span>atenuada exponencialmente<\/span><\/a><span>\u00a0, e a taxa de dose de f\u00f3tons prim\u00e1rios, levando em considera\u00e7\u00e3o o escudo, \u00e9 dada por:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/dose-rate-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25304 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/dose-rate-calculation.png\" alt=\"c\u00e1lculo da taxa de dose\" width=\"671\" height=\"307\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/dose-rate-calculation.png\" \/><\/a><\/p>\n<p><span>Como pode ser visto, n\u00e3o consideramos o ac\u00famulo de radia\u00e7\u00e3o secund\u00e1ria.\u00a0Se part\u00edculas secund\u00e1rias forem produzidas ou se a radia\u00e7\u00e3o prim\u00e1ria mudar sua energia ou dire\u00e7\u00e3o, a atenua\u00e7\u00e3o efetiva ser\u00e1 muito menor.\u00a0Essa suposi\u00e7\u00e3o geralmente subestima a taxa de dose verdadeira, especialmente para blindagens espessas e quando o ponto de dose est\u00e1 pr\u00f3ximo \u00e0 superf\u00edcie da blindagem, mas essa suposi\u00e7\u00e3o simplifica todos os c\u00e1lculos.\u00a0Nesse caso, a taxa real de dose (com o ac\u00famulo de radia\u00e7\u00e3o secund\u00e1ria) ser\u00e1 mais de duas vezes maior.<\/span><\/p>\n<p><span>Para calcular a\u00a0<\/span><strong><span>taxa de dose absorvida<\/span><\/strong><span>\u00a0, precisamos usar a f\u00f3rmula:<\/span><\/p>\n<ul>\n<li><span>k = 5,76 x 10\u00a0<\/span><sup><span>-7<\/span><\/sup><\/li>\n<li><span>S = 3,7 x 10\u00a0<\/span><sup><span>10<\/span><\/sup><span>\u00a0s\u00a0<\/span><sup><span>-1<\/span><\/sup><\/li>\n<li><span>E = 0,662 MeV<\/span><\/li>\n<li><span>\u03bc\u00a0<\/span><sub><span>t<\/span><\/sub><span>\u00a0\/ \u03c1 =\u00a0<\/span><span>0,0326 cm\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0\/ g (os valores est\u00e3o dispon\u00edveis no NIST)<\/span><\/li>\n<li><span>\u03bc = 1,289 cm\u00a0<\/span><sup><span>-1<\/span><\/sup><span>\u00a0(os valores est\u00e3o dispon\u00edveis no NIST)<\/span><\/li>\n<li><span>D = 5 cm<\/span><\/li>\n<li><span>r = 10 cm<\/span><\/li>\n<\/ul>\n<p><strong><span>Resultado:<\/span><\/strong><\/p>\n<p><span>A taxa de dose absorvida resultante em cinza por hora \u00e9 ent\u00e3o:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation-1.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25319 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation-1.png\" alt=\"taxa de dose absorvida - cinza - c\u00e1lculo\" width=\"551\" height=\"153\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation-1.png\" \/><\/a><\/p>\n<p><span>Como o fator de pondera\u00e7\u00e3o da radia\u00e7\u00e3o para os raios gama \u00e9 igual a um e assumimos o campo uniforme da radia\u00e7\u00e3o, podemos calcular diretamente a taxa de dose equivalente a partir da taxa de dose absorvida como:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-sievert-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25390 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-sievert-calculation.png\" alt=\"dose equivalente - sievert - c\u00e1lculo\" width=\"463\" height=\"74\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-sievert-calculation.png\" \/><\/a><\/p>\n<p><span>Se queremos dar conta do ac\u00famulo de radia\u00e7\u00e3o secund\u00e1ria, precisamos incluir o fator de ac\u00famulo.\u00a0A\u00a0<\/span><strong><span>f\u00f3rmula estendida<\/span><\/strong><span>\u00a0para a taxa de dose \u00e9 ent\u00e3o:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25303 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation.png\" alt=\"taxa de dose absorvida - cinza\" width=\"693\" height=\"158\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation.png\" \/><\/a><\/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>Mas qual \u00e9 a rela\u00e7\u00e3o entre becquerels (radioatividade), cinzas (dose absorvida) e sieverts (dose equivalente)?\u00a0Este artigo mostra como converter e calcular essas quantidades.\u00a0Dosimetria de Radia\u00e7\u00e3o Na prote\u00e7\u00e3o contra radia\u00e7\u00e3o, o\u00a0sievert\u00a0\u00e9 uma unidade derivada de\u00a0dose equivalente\u00a0e\u00a0dose efetiva.\u00a0O sievert representa o efeito biol\u00f3gico equivalente ao dep\u00f3sito de um joule de energia de raios gama em um quilograma &#8230; <a title=\"O que \u00e9 Sievert &#8211; Grey &#8211; Becquerel &#8211; Convers\u00e3o &#8211; C\u00e1lculo &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/\" aria-label=\"More on O que \u00e9 Sievert &#8211; Grey &#8211; Becquerel &#8211; Convers\u00e3o &#8211; C\u00e1lculo &#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 Sievert - Grey - Becquerel - Convers\u00e3o - C\u00e1lculo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Mas qual \u00e9 a rela\u00e7\u00e3o entre becquerels (radioatividade), cinzas (dose absorvida) e sieverts (dose equivalente)? Este artigo mostra como converter e calcular essas quantidades. Dosimetria de Radia\u00e7\u00e3o\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O que \u00e9 Sievert - Grey - Becquerel - Convers\u00e3o - C\u00e1lculo - Defini\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Mas qual \u00e9 a rela\u00e7\u00e3o entre becquerels (radioatividade), cinzas (dose absorvida) e sieverts (dose equivalente)? Este artigo mostra como converter e calcular essas quantidades. Dosimetria de Radia\u00e7\u00e3o\" \/>\n<meta property=\"og:url\" content=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/\" \/>\n<meta property=\"og:site_name\" content=\"Radiation Dosimetry\" \/>\n<meta property=\"article:published_time\" content=\"2020-07-23T07:11:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-07-23T07:16:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/sievert-radiation-definition-definition-min-300x267.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\">\n\t<meta name=\"twitter:data1\" content=\"Nick Connor\">\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\">\n\t<meta name=\"twitter:data2\" content=\"10 minutos\">\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"http:\/\/www.radiation-dosimetry.org\/#website\",\"url\":\"http:\/\/www.radiation-dosimetry.org\/\",\"name\":\"Radiation Dosimetry\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"http:\/\/www.radiation-dosimetry.org\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-BR\"},{\"@type\":\"ImageObject\",\"@id\":\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/#primaryimage\",\"inLanguage\":\"pt-BR\",\"url\":\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/sievert-radiation-definition-definition-min-300x267.png\"},{\"@type\":\"WebPage\",\"@id\":\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/#webpage\",\"url\":\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/\",\"name\":\"O que \\u00e9 Sievert - Grey - Becquerel - Convers\\u00e3o - C\\u00e1lculo - Defini\\u00e7\\u00e3o\",\"isPartOf\":{\"@id\":\"http:\/\/www.radiation-dosimetry.org\/#website\"},\"primaryImageOfPage\":{\"@id\":\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/#primaryimage\"},\"datePublished\":\"2020-07-23T07:11:14+00:00\",\"dateModified\":\"2020-07-23T07:16:58+00:00\",\"author\":{\"@id\":\"http:\/\/www.radiation-dosimetry.org\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\"},\"description\":\"Mas qual \\u00e9 a rela\\u00e7\\u00e3o entre becquerels (radioatividade), cinzas (dose absorvida) e sieverts (dose equivalente)? Este artigo mostra como converter e calcular essas quantidades. Dosimetria de Radia\\u00e7\\u00e3o\",\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-sievert-grey-becquerel-conversao-calculo-definicao\/\"]}]},{\"@type\":\"Person\",\"@id\":\"http:\/\/www.radiation-dosimetry.org\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\",\"name\":\"Nick Connor\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","_links":{"self":[{"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/posts\/21974"}],"collection":[{"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/comments?post=21974"}],"version-history":[{"count":0,"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/posts\/21974\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/media?parent=21974"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/categories?post=21974"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/tags?post=21974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}