{"id":17860,"date":"2020-06-22T17:52:38","date_gmt":"2020-06-22T17:52:38","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-o-radon-222-radiacao-dose-definicao\/"},"modified":"2020-07-22T10:53:53","modified_gmt":"2020-07-22T10:53:53","slug":"o-que-e-o-radon-222-radiacao-dose-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-radon-222-radiacao-dose-definicao\/","title":{"rendered":"O que \u00e9 o Radon-222 &#8211; Radia\u00e7\u00e3o &#8211; Dose &#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\">O rad\u00f4nio-222 \u00e9 um radiois\u00f3topo de rad\u00f4nio.\u00a0O rad\u00f4nio-222 \u00e9 um g\u00e1s produzido pela decomposi\u00e7\u00e3o do r\u00e1dio-226.\u00a0A dose m\u00e9dia anual de radia\u00e7\u00e3o para uma pessoa a partir de rad\u00f4nio \u00e9 de cerca de 2 mSv \/ ano.\u00a0Dosimetria de Radia\u00e7\u00e3o<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<p><strong>O rad\u00f4nio-222 \u00e9 um radiois\u00f3topo de rad\u00f4nio.\u00a0O r\u00e1don<\/strong>\u00a0\u00e9 um\u00a0<strong>g\u00e1s nobre<\/strong>\u00a0incolor, inodoro e ins\u00edpido\u00a0, que ocorre naturalmente como produto decadente do r\u00e1dio.\u00a0Todos os is\u00f3topos de rad\u00f4nio s\u00e3o\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/\">radioativos<\/a>\u00a0, mas os dois is\u00f3topos de\u00a0<strong>rad\u00f4nio, rad\u00f4nio-222<\/strong>\u00a0e\u00a0<strong>rad\u00e3o-220,<\/strong>\u00a0s\u00e3o muito importantes do ponto de vista da prote\u00e7\u00e3o contra radia\u00e7\u00e3o.<\/p>\n<ul>\n<li>\n<figure id=\"attachment_25771\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-25771\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radon-and-thoron.png\"><img loading=\"lazy\" class=\"size-medium wp-image-25771 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radon-and-thoron-300x300.png\" alt=\"r\u00e1don e toro\" width=\"300\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radon-and-thoron-300x300.png\" \/><\/a><figcaption id=\"caption-attachment-25771\" class=\"wp-caption-text\">Fonte: JANIS (Software de Informa\u00e7\u00e3o de Dados Nucleares baseado em Java);\u00a0ENDF \/ B-VII.1<\/figcaption><\/figure>\n<p><strong>Rad\u00e3o-222<\/strong>\u00a0.\u00a0O is\u00f3topo de rad\u00f4nio-222 \u00e9 um produto natural de decomposi\u00e7\u00e3o do is\u00f3topo de ur\u00e2nio mais est\u00e1vel (ur\u00e2nio-238), portanto \u00e9 um membro da\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-chain\/radioactive-series-radioactive-cascade\/uranium-series\/\">s\u00e9rie<\/a>\u00a0de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-chain\/radioactive-series-radioactive-cascade\/uranium-series\/\">ur\u00e2nio<\/a>\u00a0.<\/li>\n<li><strong>Rad\u00e3o-220<\/strong>\u00a0.\u00a0O is\u00f3topo do rad\u00f4nio-220, geralmente chamado de\u00a0<strong>t\u00f3rio<\/strong>\u00a0, \u00e9 um produto natural de decomposi\u00e7\u00e3o do is\u00f3topo de t\u00f3rio mais est\u00e1vel (\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/thorium\/\">t\u00f3rio-232<\/a>\u00a0), portanto, \u00e9 um membro da\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-chain\/radioactive-series-radioactive-cascade\/thorium-series\/\">s\u00e9rie<\/a>\u00a0de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-chain\/radioactive-series-radioactive-cascade\/thorium-series\/\">t\u00f3rio<\/a>\u00a0.<\/li>\n<\/ul>\n<p>\u00c9 importante notar que o r\u00e1don \u00e9 um\u00a0<strong>g\u00e1s nobre<\/strong>\u00a0, enquanto todos os seus produtos de decomposi\u00e7\u00e3o s\u00e3o\u00a0<strong>metais<\/strong>\u00a0.\u00a0O principal mecanismo para a entrada de r\u00e1don na atmosfera \u00e9 a\u00a0<strong>difus\u00e3o atrav\u00e9s do solo<\/strong>\u00a0.\u00a0Como g\u00e1s, o r\u00e1don difunde-se atrav\u00e9s das rochas e do solo.\u00a0Quando o r\u00e1don se desintegra, os is\u00f3topos met\u00e1licos filhas s\u00e3o \u00edons que ser\u00e3o ligados a outras mol\u00e9culas como a \u00e1gua e as part\u00edculas de aerossol no ar.\u00a0Portanto, todas as discuss\u00f5es sobre as concentra\u00e7\u00f5es de rad\u00f4nio no ambiente se referem ao\u00a0<strong>rad\u00f4nio-222<\/strong>.\u00a0Enquanto a taxa m\u00e9dia de produ\u00e7\u00e3o de r\u00e1don-220 (thoron) \u00e9 aproximadamente a mesma do r\u00e1don-222, a quantidade de r\u00e1don-220 no ambiente \u00e9 muito menor que a do r\u00e1don-222 devido \u00e0 meia-vida significativamente mais curta ( tem menos tempo para difundir) o r\u00e1don 222 (55 segundos, contra 3,8 dias, respectivamente).\u00a0Simplesmente o rad\u00f4nio-220 tem menor chance de escapar da rocha.<\/p>\n<p>Veja tamb\u00e9m:\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/sources-of-radiation\/radon-health-effects-health-risks\/\">Radon &#8211; efeitos na sa\u00fade<\/a><\/p>\n<h3><strong>Radon-222<\/strong><\/h3>\n<figure id=\"attachment_25768\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-25768\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radon-source-environment.png\"><img loading=\"lazy\" class=\"size-medium wp-image-25768 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radon-source-environment-300x170.png\" alt=\"r\u00e1don - fonte - ambiente\" width=\"300\" height=\"170\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radon-source-environment-300x170.png\" \/><\/a><figcaption id=\"caption-attachment-25768\" class=\"wp-caption-text\">S\u00e9rie de ur\u00e2nio &#8211; fonte de rad\u00f4nio-222.<\/figcaption><\/figure>\n<p><strong>O rad\u00f4nio-222<\/strong>\u00a0\u00e9 um g\u00e1s produzido pela decomposi\u00e7\u00e3o do r\u00e1dio-226.\u00a0Ambos fazem parte da s\u00e9rie natural de ur\u00e2nio.\u00a0Como o ur\u00e2nio \u00e9 encontrado no solo em todo o mundo em concentra\u00e7\u00f5es variadas, tamb\u00e9m a dose do r\u00e1don gasoso est\u00e1 variando em todo o mundo.\u00a0<strong>O r\u00e1don 222<\/strong>\u00a0\u00e9 o is\u00f3topo mais importante e mais est\u00e1vel do r\u00e1don.\u00a0Sua meia-vida \u00e9 de apenas\u00a0<strong>3,8 dias<\/strong>\u00a0, tornando o r\u00e1don um dos elementos mais raros, pois decai rapidamente.\u00a0Uma fonte importante de radia\u00e7\u00e3o natural \u00e9 o g\u00e1s rad\u00f4nio, que escorre continuamente da rocha, mas pode, devido \u00e0 sua alta densidade, acumular-se em casas com pouca ventila\u00e7\u00e3o.\u00a0O fato de\u00a0<strong>rad\u00f4nio \u00e9 g\u00e1s<\/strong>desempenha um papel crucial na dissemina\u00e7\u00e3o de todos os seus n\u00facleos-filha.\u00a0O Simply Radon \u00e9 um meio de transporte da rocha para a atmosfera (ou dentro de edif\u00edcios) por seus produtos de deteriora\u00e7\u00e3o de curta dura\u00e7\u00e3o (\u00a0<strong>Pb-210<\/strong>\u00a0e\u00a0<strong>Po-210<\/strong>\u00a0), que apresentam muito mais riscos \u00e0 sa\u00fade.<\/p>\n<p><strong>O r\u00e1don<\/strong>\u00a0\u00e9 geralmente a maior fonte natural de radia\u00e7\u00e3o que contribui para a exposi\u00e7\u00e3o dos membros do p\u00fablico, \u00e0s vezes representando\u00a0<strong>metade da exposi\u00e7\u00e3o total (cerca de 2 mSv \/ ano)<\/strong>\u00a0de todas as fontes.\u00a0O risco para a sa\u00fade devido \u00e0 exposi\u00e7\u00e3o ao\u00a0<strong>r\u00e1don<\/strong>\u00a0e ao\u00a0<strong>t\u00f4nio<\/strong>\u00a0prov\u00e9m principalmente da inala\u00e7\u00e3o dos produtos de decaimento de curta dura\u00e7\u00e3o (Pb-210 e Po-210) e da resultante\u00a0irradia\u00e7\u00e3o de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\">part\u00edculas alfa<\/a>\u00a0dos br\u00f4nquios e pulm\u00f5es.<\/p>\n<p>Enquanto esses is\u00f3topos estiverem fora do corpo, somente a\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">radia\u00e7\u00e3o gama<\/a>\u00a0poder\u00e1 administrar uma dose.\u00a0Mas o r\u00e1don \u00e9 um g\u00e1s e difunde-se do solo para se misturar com o ar.\u00a0A meia-vida do rad\u00f4nio-222 \u00e9 longa comparada com o tempo de perman\u00eancia do ar nos pulm\u00f5es, de modo que o rad\u00f4nio decai relativamente pouco durante a respira\u00e7\u00e3o.\u00a0Al\u00e9m disso, o r\u00e1don \u00e9 um g\u00e1s nobre e sua in\u00e9rcia impede sua reten\u00e7\u00e3o a longo prazo no corpo.\u00a0Mas quando o rad\u00f4nio se desintegra, os\u00a0<strong>is\u00f3topos met\u00e1licos filhas<\/strong>\u00a0(\u00a0<strong>Pb-210<\/strong>\u00a0e\u00a0<strong>Po-210<\/strong>) n\u00e3o s\u00e3o inertes e devem ser ligados a outras mol\u00e9culas como a \u00e1gua e a part\u00edculas de aerossol no ar.\u00a0Quando essas part\u00edculas s\u00e3o inaladas, parte do chumbo-210 \u00e9 retida pelo organismo.\u00a0A ingest\u00e3o de chumbo-210 tamb\u00e9m \u00e9 uma maneira poss\u00edvel.\u00a0Como o chumbo-210 \u00e9 um emissor beta fraco, n\u00e3o causa grandes doses.\u00a0O chumbo-210 \u00e9, portanto, um meio de transporte do ar interior para o corpo.\u00a0A radia\u00e7\u00e3o do rad\u00f4nio e seus produtos de decomposi\u00e7\u00e3o \u00e9 uma mistura de part\u00edculas alfa e beta, al\u00e9m de radia\u00e7\u00e3o gama.\u00a0Quando os is\u00f3topos entram no corpo, todos os tipos de radia\u00e7\u00e3o contribuem.<\/p>\n<p>Mas \u00e9 o\u00a0<strong>pol\u00f4nio-210<\/strong>\u00a0, o produto decadente do chumbo-210, que emite uma\u00a0<strong>part\u00edcula alfa de 5,3 MeV<\/strong>\u00a0, que fornece a maior parte da\u00a0<a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-dose-equivalente-definicao\/\">dose equivalente<\/a>\u00a0.\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\">As part\u00edculas alfa<\/a>\u00a0, que pertencem \u00e0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/radiobiology\/high-let-and-low-let-radiation\/\">radia\u00e7\u00e3o de alta LET<\/a>\u00a0, s\u00e3o bastante massivas e carregam uma carga positiva dupla, de modo que tendem a percorrer apenas uma curta dist\u00e2ncia e n\u00e3o penetram muito no tecido, se \u00e9 que o fazem.\u00a0No entanto, as part\u00edculas alfa depositam sua energia em um volume menor (possivelmente apenas algumas c\u00e9lulas se entrarem no corpo) e causam mais danos nessas poucas c\u00e9lulas (mais de 80% da energia absorvida pelo rad\u00f4nio \u00e9 devida \u00e0s part\u00edculas alfa).\u00a0Portanto, o\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/equivalent-dose\/radiation-weighting-factor\/\">fator de pondera\u00e7\u00e3o<\/a>\u00a0da radia\u00e7\u00e3o alfa \u00e9 igual a\u00a0<strong>20<\/strong>.\u00a0Uma\u00a0<a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-dose-absorvida-formula-equacao-definicao\/\">dose absorvida<\/a>\u00a0de 1 mGy pelas part\u00edculas alfa levar\u00e1 a uma dose equivalente a 20 mSv.\u00a0Em resumo, o r\u00e1don e o chumbo podem ser vistos como diferentes tipos de portadores do pol\u00f4nio-210.<\/p>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radon-Natural-Source-of-Radiation.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25690 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radon-Natural-Source-of-Radiation-300x212.png\" alt=\"Radon - Fonte Natural de Radia\u00e7\u00e3o\" width=\"300\" height=\"212\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radon-Natural-Source-of-Radiation-300x212.png\" \/><\/a><\/p>\n<p><span>A quantidade de is\u00f3topos ingeridos com a comida \u00e9 insignificante, e toda a preocupa\u00e7\u00e3o \u00e9 com a respira\u00e7\u00e3o e a deposi\u00e7\u00e3o de filhas de rad\u00f4nio nos br\u00f4nquios e nos pulm\u00f5es.\u00a0Entre os n\u00e3o fumantes, o rad\u00f4nio \u00e9 a maior causa de c\u00e2ncer de pulm\u00e3o e, em geral, a segunda causa.\u00a0A dose m\u00e9dia anual de radia\u00e7\u00e3o para uma pessoa a partir de rad\u00f4nio \u00e9 de cerca de\u00a0<\/span><strong><span>2 mSv \/ ano<\/span><\/strong><span>\u00a0e pode variar em v\u00e1rias ordens de magnitude de um lugar para outro.\u00a0De acordo com um relat\u00f3rio de 2003, Avalia\u00e7\u00e3o dos riscos do rad\u00f4nio nas resid\u00eancias da EPA, as evid\u00eancias epidemiol\u00f3gicas mostram uma liga\u00e7\u00e3o clara entre o c\u00e2ncer de pulm\u00e3o e as altas concentra\u00e7\u00f5es de rad\u00f4nio.<\/span><\/p>\n<p><span>\u00c9 preciso enfatizar que os cigarros tamb\u00e9m cont\u00eam pol\u00f4nio-210, origin\u00e1rio dos produtos de decomposi\u00e7\u00e3o do r\u00e1don, que aderem \u00e0s folhas do tabaco.\u00a0O pol\u00f4nio-210 emite uma part\u00edcula alfa de 5,3 MeV, que fornece a maior parte da dose equivalente.\u00a0O tabagismo intenso resulta em uma dose de 160 mSv \/ ano para manchas localizadas nas bifurca\u00e7\u00f5es dos br\u00f4nquios segmentares nos pulm\u00f5es a partir da decomposi\u00e7\u00e3o do pol\u00f4nio-210.\u00a0Esta dose n\u00e3o \u00e9 prontamente compar\u00e1vel aos\u00a0<\/span><a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-limite-de-dose-radiacao-definicao\/\"><span>limites de prote\u00e7\u00e3o contra radia\u00e7\u00e3o<\/span><\/a><span>\u00a0, uma vez que a \u00faltima lida com doses de corpo inteiro, enquanto a dose de fumar \u00e9 entregue a uma por\u00e7\u00e3o muito pequena do corpo.<\/span><\/p>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O rad\u00f4nio-222 \u00e9 um radiois\u00f3topo de rad\u00f4nio.\u00a0O rad\u00f4nio-222 \u00e9 um g\u00e1s produzido pela decomposi\u00e7\u00e3o do r\u00e1dio-226.\u00a0A dose m\u00e9dia anual de radia\u00e7\u00e3o para uma pessoa a partir de rad\u00f4nio \u00e9 de cerca de 2 mSv \/ ano.\u00a0Dosimetria de Radia\u00e7\u00e3o O rad\u00f4nio-222 \u00e9 um radiois\u00f3topo de rad\u00f4nio.\u00a0O r\u00e1don\u00a0\u00e9 um\u00a0g\u00e1s nobre\u00a0incolor, inodoro e ins\u00edpido\u00a0, que ocorre naturalmente como &#8230; <a title=\"O que \u00e9 o Radon-222 &#8211; Radia\u00e7\u00e3o &#8211; Dose &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-radon-222-radiacao-dose-definicao\/\" aria-label=\"More on O que \u00e9 o Radon-222 &#8211; Radia\u00e7\u00e3o &#8211; Dose &#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 o Radon-222 - Radia\u00e7\u00e3o - Dose - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O rad\u00f4nio-222 \u00e9 um radiois\u00f3topo de rad\u00f4nio. 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