{"id":21842,"date":"2020-07-22T07:31:02","date_gmt":"2020-07-22T07:31:02","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-contaminacao-de-superficie-definicao\/"},"modified":"2020-07-22T07:32:12","modified_gmt":"2020-07-22T07:32:12","slug":"o-que-e-contaminacao-de-superficie-definicao","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-contaminacao-de-superficie-definicao\/","title":{"rendered":"O que \u00e9 contamina\u00e7\u00e3o de superf\u00edcie &#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\">Contamina\u00e7\u00e3o de superf\u00edcie significa que material radioativo foi depositado em superf\u00edcies (como paredes, pisos).\u00a0Pode ser pouco depositado, como a poeira comum, ou pode ser firmemente fixado por rea\u00e7\u00e3o qu\u00edmica.\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<figure id=\"attachment_25949\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-25949\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radioactive-contamination.png\"><img loading=\"lazy\" class=\"wp-image-25949 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radioactive-contamination.png\" alt=\"contamina\u00e7\u00e3o radioativa\" width=\"365\" height=\"319\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radioactive-contamination.png\" \/><\/a><figcaption id=\"caption-attachment-25949\" class=\"wp-caption-text\">A contamina\u00e7\u00e3o radioativa consiste em material radioativo, que gera radia\u00e7\u00e3o ionizante.\u00a0\u00c9 a fonte de radia\u00e7\u00e3o, n\u00e3o a pr\u00f3pria radia\u00e7\u00e3o.<\/figcaption><\/figure>\n<h2>Contamina\u00e7\u00e3o de superf\u00edcie<\/h2>\n<p><strong>Contamina\u00e7\u00e3o de superf\u00edcie<\/strong>\u00a0significa que material radioativo foi depositado em superf\u00edcies (como paredes, pisos).\u00a0Pode ser pouco depositado, como a poeira comum, ou pode ser firmemente fixado por rea\u00e7\u00e3o qu\u00edmica.\u00a0Essa distin\u00e7\u00e3o \u00e9 importante e classificamos a contamina\u00e7\u00e3o da superf\u00edcie com base na facilidade com que ela pode ser removida:<\/p>\n<ul>\n<li><strong>Contamina\u00e7\u00e3o livre<\/strong>\u00a0.\u00a0No caso de contamina\u00e7\u00e3o livre (ou contamina\u00e7\u00e3o solta), o material radioativo pode ser espalhado.\u00a0\u00c9 a contamina\u00e7\u00e3o da superf\u00edcie que pode ser facilmente removida com m\u00e9todos simples de descontamina\u00e7\u00e3o.\u00a0Por exemplo, se part\u00edculas de poeira contendo v\u00e1rios radiois\u00f3topos ca\u00edrem na pele ou nas roupas da pessoa, podemos limp\u00e1-la ou remover a roupa.\u00a0Depois que uma pessoa \u00e9 descontaminada, todas as fontes de radioatividade de part\u00edculas s\u00e3o eliminadas e o indiv\u00edduo n\u00e3o \u00e9 mais contaminado.\u00a0A contamina\u00e7\u00e3o livre tamb\u00e9m \u00e9 um risco mais s\u00e9rio do que a contamina\u00e7\u00e3o fixa, porque as part\u00edculas de poeira podem se tornar transportadas pelo ar e podem ser facilmente ingeridas.\u00a0Isso leva a uma exposi\u00e7\u00e3o interna por contaminantes radioativos.\u00a0Embora quase todos os contaminantes sejam\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">beta radioativos<\/a>\u00a0com os<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/gamma-decay-gamma-radioactivity\/\">emiss\u00e3o gama<\/a>\u00a0, mas tamb\u00e9m existe a possibilidade de contamina\u00e7\u00e3o alfa em qualquer \u00e1rea de manuseio de combust\u00edvel nuclear.<\/li>\n<li><strong>Contamina\u00e7\u00e3o Fixa<\/strong>\u00a0.\u00a0No caso de contamina\u00e7\u00e3o fixa, o material radioativo n\u00e3o pode ser espalhado, pois est\u00e1 ligado quimicamente ou mecanicamente \u00e0s estruturas.\u00a0N\u00e3o pode ser removido pelos m\u00e9todos normais de limpeza.\u00a0A contamina\u00e7\u00e3o fixa \u00e9 um risco menos s\u00e9rio do que a contamina\u00e7\u00e3o livre, n\u00e3o pode ser ressuspensa ou transferida para a pele.\u00a0Portanto, o risco geralmente \u00e9 apenas externo.\u00a0Por outro lado, depende do n\u00edvel de contamina\u00e7\u00e3o.\u00a0Embora quase todos os contaminantes sejam\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">beta radioativos<\/a>\u00a0com\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/gamma-decay-gamma-radioactivity\/\">as emiss\u00f5es gama<\/a>\u00a0associadas, mas tamb\u00e9m h\u00e1 a possibilidade de contamina\u00e7\u00e3o alfa em qualquer \u00e1rea de manuseio de combust\u00edvel nuclear.\u00a0A menos que o n\u00edvel de contamina\u00e7\u00e3o seja muito grave, a taxa de dose de radia\u00e7\u00e3o gama ser\u00e1 pequena e a exposi\u00e7\u00e3o externa ser\u00e1 significativa apenas em contato com, ou muito pr\u00f3ximo, das superf\u00edcies contaminadas.\u00a0Como as\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\">part\u00edculas beta<\/a>\u00a0s\u00e3o menos penetrantes que\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">os raios gama<\/a>\u00a0, a taxa de dose beta pode ser alta apenas em contato.\u00a0Um valor de 1 mSv \/ h em contato para um n\u00edvel de contamina\u00e7\u00e3o de 400 &#8211; 500 Bq \/ cm\u00a0<sup>2<\/sup>\u00a0\u00e9 bastante representativo.<\/li>\n<\/ul>\n<h3>C\u00e1lculo da taxa de dose protegida em sieverts a partir de superf\u00edcie contaminada<\/h3>\n<p>Suponha uma superf\u00edcie que esteja\u00a0<strong>contaminada<\/strong>\u00a0por\u00a0<strong>1,0 Ci de\u00a0<sup>137<\/sup>\u00a0Cs\u00a0<\/strong><strong>.\u00a0<\/strong>Suponha que esse\u00a0<strong>contaminante<\/strong>\u00a0possa ser aproximado pela\u00a0<strong>fonte isotr\u00f3pica pontual<\/strong>\u00a0que cont\u00e9m\u00a0<strong>1,0 Ci de\u00a0<sup>137<\/sup>\u00a0Cs<\/strong>\u00a0, que tem uma\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/half-life\/\">meia-vida<\/a>\u00a0de\u00a0<strong>30,2 anos<\/strong>\u00a0.\u00a0Observe que a rela\u00e7\u00e3o entre a meia-vida e a quantidade de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/radionuclide-radioisotope\/\">radionucl\u00eddeo<\/a>\u00a0necess\u00e1ria para gerar uma atividade de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/units-of-radioactivity\/curie-unit-of-radioactivity\/\">um curie<\/a>\u00a0\u00e9 mostrada abaixo.\u00a0Essa quantidade de material pode ser calculada usando \u03bb, que \u00e9 a\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\">constante<\/a>\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:<\/p>\n<p><a href=\"https:\/\/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=\"https:\/\/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=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\" \/><\/a><\/p>\n<p>Cerca de 94,6% decai por\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">emiss\u00e3o beta<\/a>\u00a0em um\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/nuclides\/isomers\/\">is\u00f4mero nuclear<\/a>\u00a0metaest\u00e1vel\u00a0de b\u00e1rio: b\u00e1rio-137m.\u00a0O pico principal de f\u00f3tons de Ba-137m \u00e9\u00a0<strong>662 keV<\/strong>\u00a0.\u00a0Para esse c\u00e1lculo, suponha que todos os decaimentos passem por esse canal.<\/p>\n<p><strong>Calcule a taxa de dose prim\u00e1ria do f\u00f3ton<\/strong>\u00a0, em sieverts por hora (Sv.h\u00a0<sup>-1<\/sup>\u00a0), na superf\u00edcie externa de uma blindagem de chumbo com 5 cm de espessura.\u00a0Em seguida,\u00a0<strong>calcule as\u00a0<\/strong><strong>doses equivalentes e efetivas<\/strong>\u00a0para dois casos.<\/p>\n<ol>\n<li>Suponha que esse campo de radia\u00e7\u00e3o externa penetre\u00a0<strong>uniformemente<\/strong>\u00a0por todo o corpo.\u00a0Isso significa: Calcule a\u00a0<strong>taxa efetiva de dose para todo o corpo<\/strong>\u00a0.<\/li>\n<li>Suponha que esse campo de radia\u00e7\u00e3o externa penetre\u00a0<strong>apenas os pulm\u00f5es<\/strong>\u00a0e os outros \u00f3rg\u00e3os estejam completamente protegidos.\u00a0Isso significa: Calcule a\u00a0<strong>taxa de dose efetiva<\/strong>\u00a0.<\/li>\n<\/ol>\n<p>Observe que a 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<strong>10 cm<\/strong>\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.<\/p>\n<p>Veja tamb\u00e9m:\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\">Atenua\u00e7\u00e3o de raios gama<\/a><\/p>\n<p>Veja tamb\u00e9m:\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/shielding-of-ionizing-radiation\/shielding-gamma-radiation\/\">Blindagem de raios gama<\/a><\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/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=\"https:\/\/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=\"https:\/\/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=\"https:\/\/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><sup>\u00a0<\/sup><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=\"https:\/\/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=\"https:\/\/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=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation-1.png\" \/><\/a><\/p>\n<p><strong><span>1) irradia\u00e7\u00e3o uniforme<\/span><\/strong><\/p>\n<p><span>Como o\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/equivalent-dose\/radiation-weighting-factor\/\"><span>fator de pondera\u00e7\u00e3o<\/span><\/a><span>\u00a0da\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/equivalent-dose\/radiation-weighting-factor\/\">radia\u00e7\u00e3o<\/a>\u00a0para\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\"><span>os raios gama<\/span><\/a><span>\u00a0\u00e9 igual a um e assumimos o campo de radia\u00e7\u00e3o uniforme (o fator de pondera\u00e7\u00e3o do tecido tamb\u00e9m \u00e9 igual \u00e0 unidade), podemos calcular diretamente a taxa de dose equivalente e a taxa de dose efetiva (E = H\u00a0<\/span><sub><span>T<\/span><\/sub><span>\u00a0) a partir da taxa de dose absorvida, como:<\/span><\/p>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/calculation-effective-dose-uniform.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25478 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/calculation-effective-dose-uniform.png\" alt=\"c\u00e1lculo - dose efetiva - uniforme\" width=\"467\" height=\"182\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/calculation-effective-dose-uniform.png\" \/><\/a><\/p>\n<p><strong><span>2) irradia\u00e7\u00e3o parcial<\/span><\/strong><\/p>\n<p><span>Neste caso, assumimos uma irradia\u00e7\u00e3o parcial apenas dos pulm\u00f5es.\u00a0Assim, temos que utilizar o\u00a0<\/span><strong><span>factor de pondera\u00e7\u00e3o de tecido<\/span><\/strong><span>\u00a0, o que \u00e9 igual a\u00a0<\/span><strong><span>w\u00a0<\/span><sub><span>T<\/span><\/sub><span>\u00a0= 0,12<\/span><\/strong><span>\u00a0.\u00a0O fator de pondera\u00e7\u00e3o da radia\u00e7\u00e3o para raios gama \u00e9 igual a um.\u00a0Como resultado, podemos calcular a taxa de dose efetiva como:<\/span><\/p>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/calculation-effective-dose-non-uniform.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25480 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/calculation-effective-dose-non-uniform.png\" alt=\"c\u00e1lculo - dose efetiva - n\u00e3o uniforme\" width=\"495\" height=\"178\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/calculation-effective-dose-non-uniform.png\" \/><\/a><\/p>\n<p><span>Observe que, se uma parte do corpo (por exemplo, os pulm\u00f5es) recebe uma dose de radia\u00e7\u00e3o, isso representa um risco para um efeito particularmente prejudicial (por exemplo, c\u00e2ncer de pulm\u00e3o).\u00a0Se a mesma dose \u00e9 administrada a outro \u00f3rg\u00e3o, isso representa um fator de risco diferente.<\/span><\/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=\"https:\/\/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=\"https:\/\/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=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation.png\" \/><\/a><\/p>\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>Contamina\u00e7\u00e3o de superf\u00edcie significa que material radioativo foi depositado em superf\u00edcies (como paredes, pisos).\u00a0Pode ser pouco depositado, como a poeira comum, ou pode ser firmemente fixado por rea\u00e7\u00e3o qu\u00edmica.\u00a0Dosimetria de Radia\u00e7\u00e3o A contamina\u00e7\u00e3o radioativa consiste em material radioativo, que gera radia\u00e7\u00e3o ionizante.\u00a0\u00c9 a fonte de radia\u00e7\u00e3o, n\u00e3o a pr\u00f3pria radia\u00e7\u00e3o. Contamina\u00e7\u00e3o de superf\u00edcie Contamina\u00e7\u00e3o de &#8230; <a title=\"O que \u00e9 contamina\u00e7\u00e3o de superf\u00edcie &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-contaminacao-de-superficie-definicao\/\" aria-label=\"More on O que \u00e9 contamina\u00e7\u00e3o de superf\u00edcie &#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 contamina\u00e7\u00e3o de superf\u00edcie - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Contamina\u00e7\u00e3o de superf\u00edcie significa que material radioativo foi depositado em superf\u00edcies (como paredes, pisos). Pode ser pouco depositado, como a poeira comum, ou pode ser firmemente fixado por rea\u00e7\u00e3o qu\u00edmica. 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=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-contaminacao-de-superficie-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 contamina\u00e7\u00e3o de superf\u00edcie - Defini\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Contamina\u00e7\u00e3o de superf\u00edcie significa que material radioativo foi depositado em superf\u00edcies (como paredes, pisos). Pode ser pouco depositado, como a poeira comum, ou pode ser firmemente fixado por rea\u00e7\u00e3o qu\u00edmica. 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