{"id":21960,"date":"2020-07-23T06:36:29","date_gmt":"2020-07-23T06:36:29","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-dose-absorvida-formula-equacao-definicao\/"},"modified":"2020-07-23T06:40:18","modified_gmt":"2020-07-23T06:40:18","slug":"o-que-e-dose-absorvida-formula-equacao-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-dose-absorvida-formula-equacao-definicao\/","title":{"rendered":"O que \u00e9 Dose Absorvida &#8211; F\u00f3rmula &#8211; Equa\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\">Este artigo resume as principais f\u00f3rmulas e equa\u00e7\u00f5es para o c\u00e1lculo da dose absorvida e da taxa de dose absorvida.&nbsp;Dose Absorvida &#8211; F\u00f3rmula &#8211; Equa\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>Dose Absorvida &#8211; Equa\u00e7\u00e3o<\/h2>\n<p><strong>Dose absorvida<\/strong>&nbsp;\u00e9 definida como a quantidade de energia depositada pela radia\u00e7\u00e3o ionizante em uma subst\u00e2ncia.&nbsp;<strong>Dose absorvida<\/strong>&nbsp;\u00e9 dado o s\u00edmbolo&nbsp;<strong>D<\/strong>&nbsp;.&nbsp;A dose absorvida \u00e9 geralmente medida em uma unidade chamada&nbsp;<strong>cinza<\/strong>&nbsp;(Gy), que \u00e9 derivada do sistema SI.&nbsp;\u00c0s vezes, a&nbsp;unidade n\u00e3o-SI&nbsp;<strong>rad<\/strong>&nbsp;tamb\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\" data-mce-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\" data-mce-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-definition.png\"><\/a><\/p>\n<p>Unidades de dose absorvida:<\/p>\n<ul>\n<li><strong>Gray<\/strong>&nbsp;.&nbsp;Uma dose de um cinza \u00e9 equivalente a uma unidade de energia (joule) depositada em um quilograma de uma subst\u00e2ncia.<\/li>\n<li><strong>RAD<\/strong>&nbsp;.&nbsp;Uma dose de um rad \u00e9 equivalente \u00e0 deposi\u00e7\u00e3o de cem ergs de energia em um grama de qualquer material.<\/li>\n<\/ul>\n<h2>Taxa de Dose Absorvida &#8211; Equa\u00e7\u00e3o<\/h2>\n<p>A&nbsp;<strong>taxa de dose absorvida<\/strong>&nbsp;\u00e9 a taxa na qual uma dose absorvida \u00e9 recebida.&nbsp;\u00c9 uma medida da intensidade da dose de radia\u00e7\u00e3o (ou for\u00e7a).&nbsp;A taxa de dose absorvida \u00e9, portanto, definida como:<\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-definition.png\" data-mce-href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25346 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-definition.png\" alt=\"taxa de dose absorvida - defini\u00e7\u00e3o\" width=\"198\" height=\"67\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-definition.png\" data-mce-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-definition.png\"><\/a><\/p>\n<p>Nas unidades convencionais, \u00e9 medido em mrad \/ s&nbsp;<strong>,<\/strong>&nbsp;&nbsp;rad \/ h, mGy \/ s ou Gy \/ h.&nbsp;Como a quantidade de exposi\u00e7\u00e3o \u00e0 radia\u00e7\u00e3o depende diretamente (linearmente)&nbsp;<strong>do tempo que as<\/strong>&nbsp;pessoas passam perto da fonte de radia\u00e7\u00e3o, a dose absorvida \u00e9 igual \u00e0 for\u00e7a do campo de radia\u00e7\u00e3o (taxa de dose) multiplicada pelo tempo gasto nesse campo.&nbsp;O exemplo acima indica que uma pessoa pode esperar receber uma dose de 25 millirems permanecendo em um campo de 50 millirems \/ hora por trinta minutos.<\/p>\n<h2>C\u00e1lculo da taxa de dose absorvida<\/h2>\n<p>Suponha a&nbsp;<strong>fonte isotr\u00f3pica pontual<\/strong>&nbsp;que cont\u00e9m&nbsp;<strong>1,0 Ci de&nbsp;<sup>137<\/sup>&nbsp;Cs<\/strong>&nbsp;, que tem uma&nbsp;<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/half-life\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/half-life\/\">meia-vida<\/a>&nbsp;de&nbsp;<strong>30,2 anos<\/strong>&nbsp;.&nbsp;Observe que a rela\u00e7\u00e3o entre a meia-vida e a quantidade de&nbsp;<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/radionuclide-radioisotope\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/radionuclide-radioisotope\/\">radionucl\u00eddeo<\/a>&nbsp;necess\u00e1ria para gerar uma atividade de&nbsp;<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/units-of-radioactivity\/curie-unit-of-radioactivity\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/units-of-radioactivity\/curie-unit-of-radioactivity\/\">um curie<\/a>&nbsp;\u00e9 mostrada abaixo.&nbsp;Essa quantidade de material pode ser calculada usando \u03bb, que \u00e9 a&nbsp;<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\">constante<\/a>&nbsp;de&nbsp;<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\">decaimento<\/a>&nbsp;de determinado nucl\u00eddeo:<\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\" data-mce-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\" data-mce-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\"><\/a><\/p>\n<p>Aproximadamente 94,6% decai por&nbsp;<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">emiss\u00e3o beta<\/a>&nbsp;em um&nbsp;<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/nuclides\/isomers\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/nuclides\/isomers\/\">is\u00f4mero nuclear<\/a>&nbsp;metaest\u00e1vel&nbsp;de b\u00e1rio: b\u00e1rio-137m.&nbsp;O pico principal de f\u00f3tons de Ba-137m \u00e9&nbsp;<strong>662 keV<\/strong>&nbsp;.&nbsp;Para esse c\u00e1lculo, suponha que todos os decaimentos passem por esse canal.<\/p>\n<p><strong>Determine a taxa de dose prim\u00e1ria do f\u00f3ton<\/strong>&nbsp;, em cinza por hora (Gy.h&nbsp;<sup>-1<\/sup>&nbsp;), na superf\u00edcie externa de uma blindagem de chumbo com 5 cm de espessura.&nbsp;A taxa de dose prim\u00e1ria de f\u00f3tons negligencia todas as part\u00edculas secund\u00e1rias.&nbsp;Suponha que a dist\u00e2ncia efetiva da fonte do ponto de dose seja&nbsp;<strong>10 cm<\/strong>&nbsp;.&nbsp;Tamb\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.<\/p>\n<p><span style=\"\">Veja tamb\u00e9m:&nbsp;<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\"><span style=\"\">Atenua\u00e7\u00e3o de raios gama<\/span><\/a><\/p>\n<p><span style=\"\">Veja tamb\u00e9m:&nbsp;<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/shielding-of-ionizing-radiation\/shielding-gamma-radiation\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/shielding-of-ionizing-radiation\/shielding-gamma-radiation\/\"><span style=\"\">Blindagem de raios gama<\/span><\/a><\/p>\n<p><strong><span style=\"\">Solu\u00e7\u00e3o:<\/span><\/strong><\/p>\n<p><span style=\"\">A taxa de dose prim\u00e1ria de f\u00f3tons \u00e9&nbsp;<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\" data-mce-href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\"><span style=\"\">atenuada exponencialmente<\/span><\/a><span style=\"\">&nbsp;, 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\" data-mce-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\" data-mce-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/dose-rate-calculation.png\"><\/a><\/p>\n<p><span style=\"\">Como pode ser visto, n\u00e3o consideramos o ac\u00famulo de radia\u00e7\u00e3o secund\u00e1ria.&nbsp;Se 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.&nbsp;Essa 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.&nbsp;Nesse 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 style=\"\">Para calcular a&nbsp;<\/span><strong><span style=\"\">taxa de dose absorvida<\/span><\/strong><span style=\"\">&nbsp;, precisamos usar a f\u00f3rmula:<\/span><\/p>\n<ul>\n<li><span style=\"\">k = 5,76 x 10&nbsp;<\/span><sup><span style=\"\">-7<\/span><\/sup><\/li>\n<li><span style=\"\">S = 3,7 x 10&nbsp;<\/span><sup><span style=\"\">10<\/span><\/sup><span style=\"\">&nbsp;s&nbsp;<\/span><sup><span style=\"\">-1<\/span><\/sup><\/li>\n<li><span style=\"\">E = 0,662 MeV<\/span><\/li>\n<li><span style=\"\">\u03bc&nbsp;<\/span><sub><span style=\"\">t<\/span><\/sub><span style=\"\">&nbsp;\/ \u03c1 =&nbsp;<\/span><sup>&nbsp;<\/sup><span style=\"\">0,0326 cm&nbsp;<\/span><sup><span style=\"\">2<\/span><\/sup><span style=\"\">&nbsp;\/ g (os valores est\u00e3o dispon\u00edveis no NIST)<\/span><\/li>\n<li><span style=\"\">\u03bc = 1,289 cm&nbsp;<\/span><sup><span style=\"\">-1<\/span><\/sup><span style=\"\">&nbsp;(os valores est\u00e3o dispon\u00edveis no NIST)<\/span><\/li>\n<li><span style=\"\">D = 5 cm<\/span><\/li>\n<li><span style=\"\">r = 10 cm<\/span><\/li>\n<\/ul>\n<p><strong><span style=\"\">Resultado:<\/span><\/strong><\/p>\n<p><span style=\"\">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\" data-mce-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\" data-mce-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation-1.png\"><\/a><\/p>\n<p><span style=\"\">Se queremos dar conta do ac\u00famulo de radia\u00e7\u00e3o secund\u00e1ria, precisamos incluir o fator de ac\u00famulo.&nbsp;A&nbsp;<\/span><strong><span style=\"\">f\u00f3rmula estendida<\/span><\/strong><span style=\"\">&nbsp;para 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\" data-mce-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\" data-mce-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation.png\"><\/a><\/p>\n<p><\/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>Este artigo resume as principais f\u00f3rmulas e equa\u00e7\u00f5es para o c\u00e1lculo da dose absorvida e da taxa de dose absorvida.&nbsp;Dose Absorvida &#8211; F\u00f3rmula &#8211; Equa\u00e7\u00e3o Dose Absorvida &#8211; Equa\u00e7\u00e3o Dose absorvida&nbsp;\u00e9 definida como a quantidade de energia depositada pela radia\u00e7\u00e3o ionizante em uma subst\u00e2ncia.&nbsp;Dose absorvida&nbsp;\u00e9 dado o s\u00edmbolo&nbsp;D&nbsp;.&nbsp;A dose absorvida \u00e9 geralmente medida em uma &#8230; <a title=\"O que \u00e9 Dose Absorvida &#8211; F\u00f3rmula &#8211; Equa\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-dose-absorvida-formula-equacao-definicao\/\" aria-label=\"More on O que \u00e9 Dose Absorvida &#8211; F\u00f3rmula &#8211; Equa\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 Dose Absorvida - F\u00f3rmula - Equa\u00e7\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Este artigo resume as principais f\u00f3rmulas e equa\u00e7\u00f5es para o c\u00e1lculo da dose absorvida e da taxa de dose absorvida. 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