{"id":17868,"date":"2020-06-22T20:17:44","date_gmt":"2020-06-22T20:17:44","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-o-potassio-40-no-interior-do-corpo-dose-de-radiacao-definicao\/"},"modified":"2020-07-22T11:14:36","modified_gmt":"2020-07-22T11:14:36","slug":"o-que-e-o-potassio-40-no-interior-do-corpo-dose-de-radiacao-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-potassio-40-no-interior-do-corpo-dose-de-radiacao-definicao\/","title":{"rendered":"O que \u00e9 o pot\u00e1ssio-40 no interior do corpo &#8211; Dose de radia\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\">Tra\u00e7os de K-40 s\u00e3o encontrados em todo o pot\u00e1ssio, e \u00e9 o radiois\u00f3topo mais comum no corpo humano.\u00a0A dose efetiva anual de pot\u00e1ssio-40 \u00e9 de 0,2 mSv.\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>Tra\u00e7os de K-40 s\u00e3o encontrados em todo o pot\u00e1ssio, e \u00e9 o radiois\u00f3topo mais comum no\u00a0<strong>corpo humano<\/strong>\u00a0.\u00a0O K-40 \u00e9 um is\u00f3topo radioativo de pot\u00e1ssio que tem uma meia-vida muito longa de 1.251 \u00d7 10\u00a0<sup>9<\/sup>\u00a0anos e sofre os dois tipos de\u00a0<a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-radiacao-beta-definicao\/\"><strong>decaimento beta<\/strong><\/a>\u00a0.\u00a0Deste ponto de vista, tamb\u00e9m um corpo humano pode ser considerado uma fonte de antimat\u00e9ria.<\/p>\n<ul>\n<li>Cerca de 89,28% do tempo (10,72% \u00e9 por captura de el\u00e9trons), decai para o c\u00e1lcio-40 com a emiss\u00e3o de uma\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\"><strong>part\u00edcula beta<\/strong><\/a>\u00a0(\u03b2\u2212, um el\u00e9tron) com uma energia m\u00e1xima de 1,33 MeV e um\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/antineutrino\/\"><strong>antineutrino<\/strong><\/a>\u00a0, que \u00e9 uma\u00a0<strong>antipart\u00edcula<\/strong>\u00a0para o\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutrino\/\">neutrino<\/a>\u00a0.<\/li>\n<li>Muito raramente (0,001% do tempo) decair\u00e1 para o Ar-40 emitindo um\u00a0<strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/what-is-electron-properties-of-electron\/what-is-positron-properties\/\">p\u00f3sitron<\/a>\u00a0(\u03b2 +)<\/strong>\u00a0e um neutrino.<\/li>\n<\/ul>\n<p>A concentra\u00e7\u00e3o de pot\u00e1ssio no corpo humano \u00e9 estritamente baseada no princ\u00edpio homeost\u00e1tico.\u00a0O pot\u00e1ssio \u00e9 mais ou menos distribu\u00eddo no corpo (especialmente nos tecidos moles) ap\u00f3s a ingest\u00e3o de alimentos.\u00a0Um homem de 70 kg cont\u00e9m cerca de\u00a0<strong>126 g<\/strong>\u00a0de pot\u00e1ssio (0,18%), a maior parte localizada nos m\u00fasculos.\u00a0O consumo di\u00e1rio de pot\u00e1ssio \u00e9 de aproximadamente 2,5 gramas.\u00a0Portanto, a concentra\u00e7\u00e3o de pot\u00e1ssio-40 \u00e9 quase\u00a0<strong>est\u00e1vel<\/strong>\u00a0em todas as pessoas a um n\u00edvel de cerca de\u00a0<strong>55 Bq \/ kg<\/strong>\u00a0(3850 Bq no total), o que corresponde \u00e0 dose efetiva anual de\u00a0<strong>0,2 mSv<\/strong>\u00a0.<\/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<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<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Tra\u00e7os de K-40 s\u00e3o encontrados em todo o pot\u00e1ssio, e \u00e9 o radiois\u00f3topo mais comum no corpo humano.\u00a0A dose efetiva anual de pot\u00e1ssio-40 \u00e9 de 0,2 mSv.\u00a0Dosimetria de Radia\u00e7\u00e3o Tra\u00e7os de K-40 s\u00e3o encontrados em todo o pot\u00e1ssio, e \u00e9 o radiois\u00f3topo mais comum no\u00a0corpo humano\u00a0.\u00a0O K-40 \u00e9 um is\u00f3topo radioativo de pot\u00e1ssio que tem &#8230; <a title=\"O que \u00e9 o pot\u00e1ssio-40 no interior do corpo &#8211; Dose de radia\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-potassio-40-no-interior-do-corpo-dose-de-radiacao-definicao\/\" aria-label=\"More on O que \u00e9 o pot\u00e1ssio-40 no interior do corpo &#8211; Dose de radia\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 o pot\u00e1ssio-40 no interior do corpo - Dose de radia\u00e7\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Tra\u00e7os de K-40 s\u00e3o encontrados em todo o pot\u00e1ssio, e \u00e9 o radiois\u00f3topo mais comum no corpo humano. 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