{"id":18050,"date":"2020-06-25T05:36:59","date_gmt":"2020-06-25T05:36:59","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-cinza-unidade-exemplos-e-calculo-definicao\/"},"modified":"2020-07-23T10:04:15","modified_gmt":"2020-07-23T10:04:15","slug":"o-que-e-cinza-unidade-exemplos-e-calculo-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-cinza-unidade-exemplos-e-calculo-definicao\/","title":{"rendered":"O que \u00e9 cinza &#8211; unidade &#8211; Exemplos e 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\">grey &#8211; unit &#8211; Exemplos e c\u00e1lculo.\u00a0Calcule a taxa de dose prim\u00e1ria do f\u00f3ton, em cinzas por hora (Gy.h-1), na superf\u00edcie externa de uma blindagem de chumbo com 5 cm de espessura.\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<h2>Cinza &#8211; Unidade de Dose Absorvida<\/h2>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/gray_unit_radiation-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25313 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/gray_unit_radiation-min-300x267.png\" alt=\"unidade cinza\" width=\"300\" height=\"267\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/gray_unit_radiation-min-300x267.png\" \/><\/a>Uma dose de\u00a0<strong>um cinza<\/strong>\u00a0\u00e9 equivalente a uma unidade de energia (joule) depositada em um quilograma de uma subst\u00e2ncia.\u00a0Esta unidade foi nomeada em homenagem a\u00a0<strong>Louis Harold Gray<\/strong>\u00a0, que foi um dos grandes pioneiros em biologia da radia\u00e7\u00e3o.\u00a0Um cinza \u00e9 uma grande quantidade de dose absorvida.\u00a0Uma pessoa que absorveu uma dose de 1 Gy no corpo inteiro absorveu um joule de energia em cada kg de tecido corporal.<\/p>\n<h2>Exemplos de doses absorvidas em cinzas<\/h2>\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><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 seguintes, 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 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; Dormindo ao lado de algu\u00e9m<\/span><\/li>\n<li><strong><span>0,09 \u00b5Gy<\/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 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; Comendo uma banana<\/span><\/li>\n<li><strong><span>0,3 \u00b5Gy<\/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 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; Dose m\u00e9dia di\u00e1ria recebida do fundo natural<\/span><\/li>\n<li><strong><span>20 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; radiografia de t\u00f3rax<\/span><\/li>\n<li><strong><span>40 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; Um voo de avi\u00e3o de 5 horas<\/span><\/li>\n<li><strong><span>600 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; mamografia<\/span><\/li>\n<li><strong><span>1 000 \u00b5Gy<\/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 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; Dose m\u00e9dia anual recebida do fundo natural<\/span><\/li>\n<li><strong><span>5 800 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; Tomografia computadorizada de t\u00f3rax<\/span><\/li>\n<li><strong><span>10 000 \u00b5Gy<\/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 \u00b5Gy<\/span><\/strong><span>\u00a0&#8211; tomografia computadorizada de corpo inteiro<\/span><\/li>\n<li><strong><span>175 000 \u00b5Gy<\/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 \u00b5Gy<\/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 tons de cinza<\/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.\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 = 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>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<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-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><\/div>\n<\/div>\n<\/div>\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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>grey &#8211; unit &#8211; Exemplos e c\u00e1lculo.\u00a0Calcule a taxa de dose prim\u00e1ria do f\u00f3ton, em cinzas por hora (Gy.h-1), na superf\u00edcie externa de uma blindagem de chumbo com 5 cm de espessura.\u00a0Dosimetria de Radia\u00e7\u00e3o Cinza &#8211; Unidade de Dose Absorvida Uma dose de\u00a0um cinza\u00a0\u00e9 equivalente a uma unidade de energia (joule) depositada em um quilograma &#8230; <a title=\"O que \u00e9 cinza &#8211; unidade &#8211; Exemplos e c\u00e1lculo &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-cinza-unidade-exemplos-e-calculo-definicao\/\" aria-label=\"More on O que \u00e9 cinza &#8211; unidade &#8211; Exemplos e 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 cinza - unidade - Exemplos e c\u00e1lculo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"grey - unit - Exemplos e c\u00e1lculo. 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