{"id":18069,"date":"2020-06-26T16:27:45","date_gmt":"2020-06-26T16:27:45","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-cadeia-de-decaimento-radioativo-definicao\/"},"modified":"2020-07-24T05:34:26","modified_gmt":"2020-07-24T05:34:26","slug":"o-que-e-cadeia-de-decaimento-radioativo-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-cadeia-de-decaimento-radioativo-definicao\/","title":{"rendered":"O que \u00e9 Cadeia de Decaimento Radioativo &#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\">Na f\u00edsica, uma cadeia de decaimento radioativo \u00e9 uma sequ\u00eancia de n\u00facleos at\u00f4micos inst\u00e1veis \u200b\u200be seus modos de decaimento, que levam a um n\u00facleo est\u00e1vel.\u00a0As fontes desses n\u00facleos inst\u00e1veis \u200b\u200bs\u00e3o diferentes, mas a maioria dos engenheiros lida com cadeias de decaimento radioativo que ocorrem naturalmente.\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><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Production-and-Removal-of-Xenon-135.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-18613 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/calculation-effective-dose-uniform-300x117.png\" alt=\"\" width=\"300\" height=\"101\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/calculation-effective-dose-uniform-300x117.png\" \/><\/a>Na f\u00edsica, uma\u00a0<strong>cadeia de decaimento radioativo<\/strong>\u00a0\u00e9 uma sequ\u00eancia de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/atomic-nucleus\/stable-nuclei-unstable-nuclei\/\">n\u00facleos at\u00f4micos inst\u00e1veis<\/a>\u00a0e seus\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/\">modos de decaimento<\/a>\u00a0, que levam a um n\u00facleo est\u00e1vel.\u00a0As fontes desses n\u00facleos inst\u00e1veis \u200b\u200bs\u00e3o diferentes, mas a maioria dos engenheiros lida com\u00a0<strong>cadeias de decaimento radioativo de\u00a0<\/strong><strong>ocorr\u00eancia natural<\/strong>\u00a0conhecidas como\u00a0<strong>s\u00e9ries radioativas<\/strong>\u00a0.\u00a0Observe que, nos\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/\">reatores nucleares<\/a>\u00a0, existem muitos tipos de cadeias de decaimento de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/fission-fragments\/\">fragmentos<\/a>\u00a0de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/fission-fragments\/\">fiss\u00e3o<\/a>\u00a0.\u00a0Os fragmentos de fiss\u00e3o s\u00e3o\u00a0<strong>altamente inst\u00e1veis<\/strong>\u00a0(radioativos) e sofrem mais\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/\">decaimentos radioativos<\/a>\u00a0para se\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/nuclear-stability\/\">estabilizarem.<\/a>.\u00a0Essas cadeias de decaimento \u201cartificiais\u201d n\u00e3o pertencem \u00e0s s\u00e9ries radioativas que ocorrem naturalmente.<\/p>\n<h2>S\u00e9rie Radioativa &#8211; Cascata Radioativa<\/h2>\n<p><strong>As s\u00e9ries radioativas<\/strong>\u00a0(conhecidas tamb\u00e9m como cascatas radioativas) s\u00e3o\u00a0<strong>tr\u00eas<\/strong>\u00a0cadeias de decaimento radioativo de\u00a0<strong>ocorr\u00eancia natural\u00a0<\/strong>\u00a0e\u00a0<strong>uma cadeia<\/strong>\u00a0\u00a0de\u00a0<strong>decaimento radioativo artificial<\/strong>\u00a0de n\u00facleos at\u00f4micos pesados \u200b\u200be inst\u00e1veis \u200b\u200bque decaem atrav\u00e9s de uma sequ\u00eancia de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">decaimentos\u00a0<\/a><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\">alfa<\/a>\u00a0e\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">beta<\/a>\u00a0at\u00e9 que um n\u00facleo est\u00e1vel seja alcan\u00e7ado.\u00a0A maioria dos radiois\u00f3topos\u00a0<strong>n\u00e3o decai diretamente<\/strong>\u00a0para um estado est\u00e1vel e todos os is\u00f3topos\u00a0<strong>da s\u00e9rie<\/strong>\u00a0decaem da mesma maneira.\u00a0Na f\u00edsica de decaimentos nucleares, o n\u00facleo desintegrante \u00e9 geralmente chamado de\u00a0<strong>n\u00facleo pai<\/strong>\u00a0e o n\u00facleo remanescente ap\u00f3s o evento como\u00a0<strong>n\u00facleo filha<\/strong>\u00a0.\u00a0Como o decaimento alfa representa a desintegra\u00e7\u00e3o de um<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/atomic-nucleus\/parent-nucleus-daughter-nucleus\/\">n\u00facleo pai<\/a>\u00a0de uma filha atrav\u00e9s da emiss\u00e3o do n\u00facleo de um \u00e1tomo de h\u00e9lio (que cont\u00e9m quatro n\u00facleons), existem apenas\u00a0<strong>quatro s\u00e9ries de decaimento<\/strong>\u00a0.\u00a0Dentro de cada s\u00e9rie, portanto, o n\u00famero de massa dos membros pode ser expresso como quatro vezes um n\u00famero inteiro apropriado (n) mais a constante para essa s\u00e9rie.\u00a0Como resultado, a s\u00e9rie t\u00f3rio \u00e9 conhecida como s\u00e9rie 4n, a s\u00e9rie nept\u00fanio como s\u00e9rie 4n + 1, a s\u00e9rie ur\u00e2nio como s\u00e9rie 4n + 2 e a s\u00e9rie act\u00ednio como s\u00e9rie 4n + 3.<\/p>\n<p>Tr\u00eas dos conjuntos s\u00e3o chamados de s\u00e9ries naturais ou cl\u00e1ssicas.\u00a0O quarto conjunto, a s\u00e9rie nept\u00fanio, \u00e9 liderado pelo nept\u00fanio-237.\u00a0Seus membros s\u00e3o produzidos artificialmente por rea\u00e7\u00f5es nucleares e n\u00e3o ocorrem naturalmente.<\/p>\n<ul>\n<li><strong><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\/\">a s\u00e9rie de t\u00f3rio (s\u00e9rie 4n)<\/a>\u00a0,<\/strong><\/li>\n<li><strong><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\/\">a s\u00e9rie de ur\u00e2nio (s\u00e9ries 4n + 2)<\/a>\u00a0,<\/strong><\/li>\n<li><strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-chain\/radioactive-series-radioactive-cascade\/actinium-series\/\">a s\u00e9rie actinium (s\u00e9ries 4n + 3)<\/a>\u00a0,<\/strong><\/li>\n<li><strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-chain\/radioactive-series-radioactive-cascade\/neptunium-series\/\">a s\u00e9rie de nept\u00fanio (s\u00e9rie 4n + 1)<\/a>\u00a0.<\/strong><\/li>\n<\/ul>\n<p>As s\u00e9ries cl\u00e1ssicas s\u00e3o encabe\u00e7adas por\u00a0<a href=\"https:\/\/www.nuclear-power.com\/glossary\/primordial-matter\/\">n\u00facleos inst\u00e1veis \u200b\u200bprimordiais<\/a>\u00a0.\u00a0Nucl\u00eddeos primordiais s\u00e3o nucl\u00eddeos encontrados na Terra que existem em sua forma atual desde antes da forma\u00e7\u00e3o da Terra.\u00a0As quatro s\u00e9ries anteriores consistem em radiois\u00f3topos, que s\u00e3o descendentes de quatro n\u00facleos pesados \u200b\u200bcom meia-vida longa e muito longa:<\/p>\n<ul>\n<li>a s\u00e9rie de t\u00f3rio com t\u00f3rio-232 (com meia-vida de 14,0 bilh\u00f5es de anos),<\/li>\n<li>a s\u00e9rie de ur\u00e2nio com ur\u00e2nio-238 (que vive por 4,47 bilh\u00f5es de anos),<\/li>\n<li>a s\u00e9rie actinium com ur\u00e2nio-235 (com meia-vida de 0,7 bilh\u00f5es de anos).<\/li>\n<li>a s\u00e9rie de nept\u00fanios com nept\u00fanio-237 (com meia-vida de 2 milh\u00f5es de anos).<\/li>\n<\/ul>\n<p><span>As\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/half-life\/\"><span>meias-vidas<\/span><\/a><span>\u00a0de todos os n\u00facleos-filhas s\u00e3o extremamente vari\u00e1veis \u200b\u200be \u00e9 dif\u00edcil representar um intervalo de escalas de tempo que variam de segundos a bilh\u00f5es de anos.\u00a0Como os radiois\u00f3topos-filhas t\u00eam meias-vidas diferentes, o equil\u00edbrio secular \u00e9 alcan\u00e7ado ap\u00f3s algum tempo.\u00a0Na longa cadeia de decaimento de um elemento naturalmente radioativo, como o\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-238\/\"><span>ur\u00e2nio-238<\/span><\/a><span>\u00a0, onde todos os elementos da cadeia est\u00e3o em equil\u00edbrio secular, cada um dos descendentes acumulou uma quantidade de equil\u00edbrio e todos decaiu na taxa definida pelo pai original.\u00a0Se e quando o equil\u00edbrio for alcan\u00e7ado, cada is\u00f3topo filha sucessivo estar\u00e1 presente em propor\u00e7\u00e3o direta \u00e0 sua meia-vida.\u00a0Desde a sua\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/units-of-radioactivity\/calculation-of-radioactivity-becquerel-curie\/\"><span>atividade<\/span><\/a><span>\u00a0\u00e9 inversamente proporcional \u00e0 sua meia-vida, cada nucl\u00eddeo na cadeia de decaimento finalmente contribui com tantas transforma\u00e7\u00f5es individuais quanto a cabe\u00e7a da cadeia.<\/span><\/p>\n<p><span>Como pode ser visto nas figuras, a ramifica\u00e7\u00e3o ocorre nas quatro s\u00e9ries radioativas.\u00a0Isso significa que a deteriora\u00e7\u00e3o de uma determinada esp\u00e9cie pode ocorrer de mais de uma maneira.\u00a0Por exemplo, na s\u00e9rie do t\u00f3rio, o bismuto-212 decai parcialmente por emiss\u00e3o beta negativa em pol\u00f4nio-212 e parcialmente por emiss\u00e3o alfa em t\u00e1lio-206.<\/span><\/p>\n<p><strong><span>Cascata\u00a0<\/span><\/strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/radioactivity-nuclear-decay\/\"><span>radioativa<\/span><\/a><span>\u00a0influencia significativamente a\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/radioactivity-nuclear-decay\/\">radioatividade<\/a>\u00a0(\u00a0<\/span><strong><span>desintegra\u00e7\u00f5es por segundo<\/span><\/strong><span>) de amostras e materiais naturais.\u00a0Todos os descendentes est\u00e3o presentes, pelo menos de forma transit\u00f3ria, em qualquer amostra natural, seja de metal, composto ou mineral.\u00a0Por exemplo, o ur\u00e2nio puro-238 \u00e9 fracamente radioativo (proporcional \u00e0 sua meia-vida longa), mas um min\u00e9rio de ur\u00e2nio \u00e9 cerca de 13 vezes mais radioativo que o metal puro-ur\u00e2nio-238 por causa de seus is\u00f3topos filhos (por exemplo, rad\u00f4nio, r\u00e1dio, etc.) cont\u00e9m.\u00a0Os is\u00f3topos de r\u00e1dio inst\u00e1veis \u200b\u200bn\u00e3o s\u00e3o apenas emissores significativos de radioatividade, mas, como etapa seguinte da cadeia de decaimento, eles tamb\u00e9m geram rad\u00f4nio, um g\u00e1s radioativo pesado, inerte e de ocorr\u00eancia natural.\u00a0Al\u00e9m disso, o calor em decomposi\u00e7\u00e3o do ur\u00e2nio e seus produtos (por exemplo, r\u00e1don, r\u00e1dio etc.) contribuem para o aquecimento do n\u00facleo da Terra.<\/span><\/p>\n<h3><span>Tipos de deteriora\u00e7\u00e3o<\/span><\/h3>\n<p><span>Dentro de cada s\u00e9rie radioativa, existem dois modos principais de decaimento radioativo:<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\"><strong><span>Decaimento alfa<\/span><\/strong><\/a><span>\u00a0.\u00a0<\/span><strong><span>O decaimento alfa<\/span><\/strong><span>\u00a0\u00a0representa a desintegra\u00e7\u00e3o de um\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/atomic-nucleus\/parent-nucleus-daughter-nucleus\/\"><span>\u00a0n\u00facleo pai<\/span><\/a><span>\u00a0\u00a0para uma filha atrav\u00e9s da emiss\u00e3o do n\u00facleo de um \u00e1tomo de h\u00e9lio.\u00a0<\/span><a title=\"Alpha Particle\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\"><span>As part\u00edculas alfa<\/span><\/a><span>\u00a0\u00a0consistem em dois pr\u00f3tons e dois\u00a0<\/span><a title=\"N\u00eautron\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span>\u00a0n\u00eautrons<\/span><\/a><span>\u00a0\u00a0unidos em uma part\u00edcula id\u00eantica a um n\u00facleo de h\u00e9lio.\u00a0Devido \u00e0 sua massa muito grande (mais de 7000 vezes a massa da part\u00edcula beta) e \u00e0 sua carga, ela\u00a0<\/span><strong><span>\u00a0ioniza<\/span><\/strong><span>\u00a0\u00a0material<strong>\u00a0pesado<\/strong>\u00a0e tem um\u00a0<\/span><strong><span>\u00a0alcance muito curto<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\"><strong><span>Decaimento beta<\/span><\/strong><\/a><span>\u00a0.\u00a0<\/span><strong><span>Decaimento beta<\/span><\/strong><span>\u00a0\u00a0ou\u00a0<strong>\u00a0decaimento\u00a0<\/strong><\/span><strong><span>\u03b2<\/span><\/strong><span>\u00a0\u00a0representa a desintegra\u00e7\u00e3o de um n\u00facleo parental para uma filha atrav\u00e9s da emiss\u00e3o da part\u00edcula beta.\u00a0As part\u00edculas beta s\u00e3o el\u00e9trons ou p\u00f3sitrons de alta energia e alta velocidade emitidos por certos tipos de n\u00facleos radioativos, como o pot\u00e1ssio-40.\u00a0As part\u00edculas beta t\u00eam\u00a0<\/span><strong><span>\u00a0maior alcance<\/span><\/strong><span>\u00a0\u00a0de penetra\u00e7\u00e3o do que as part\u00edculas alfa, mas ainda muito menos que os raios gama. As part\u00edculas beta emitidas s\u00e3o uma forma de radia\u00e7\u00e3o ionizante, tamb\u00e9m conhecida como raios beta.\u00a0A produ\u00e7\u00e3o de part\u00edculas beta \u00e9 denominada decaimento beta.<\/span><\/li>\n<\/ul>\n<h3><span>Thorium Series<\/span><\/h3>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thorium-series-decay-chain.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25241 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thorium-series-decay-chain-300x191.png\" alt=\"s\u00e9rie de t\u00f3rio - cadeia de deteriora\u00e7\u00e3o\" width=\"300\" height=\"191\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/thorium-series-decay-chain-300x191.png\" \/><\/a><span>A\u00a0<\/span><strong><span>s\u00e9rie do t\u00f3rio<\/span><\/strong><span>\u00a0\u00e9 uma das tr\u00eas s\u00e9ries radioativas cl\u00e1ssicas que come\u00e7am com o\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/thorium\/thorium-232\/\"><span>t\u00f3rio-232 que<\/span><\/a><span>\u00a0ocorre naturalmente\u00a0.\u00a0Essa cadeia de decaimento radioativo consiste em n\u00facleos at\u00f4micos pesados \u200b\u200be inst\u00e1veis, que\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/\"><span>decaem<\/span><\/a><span>\u00a0atrav\u00e9s de uma sequ\u00eancia de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">decaimentos\u00a0<\/a><\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\"><span>alfa<\/span><\/a><span>\u00a0e\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\"><span>beta<\/span><\/a><span>\u00a0at\u00e9 que um n\u00facleo est\u00e1vel seja alcan\u00e7ado.\u00a0No caso de s\u00e9ries de t\u00f3rio, o n\u00facleo est\u00e1vel \u00e9 o chumbo-208.<\/span><\/p>\n<p><span>Como o\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\"><span>decaimento alfa<\/span><\/a><span>\u00a0representa a desintegra\u00e7\u00e3o de um\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/atomic-nucleus\/parent-nucleus-daughter-nucleus\/\"><span>n\u00facleo pai<\/span><\/a><span>\u00a0para uma filha atrav\u00e9s da emiss\u00e3o do n\u00facleo de um \u00e1tomo de h\u00e9lio (que cont\u00e9m quatro n\u00facleons), existem apenas quatro s\u00e9ries de decaimento.\u00a0Dentro de cada s\u00e9rie, portanto, o n\u00famero de massa dos membros pode ser expresso como quatro vezes um n\u00famero inteiro apropriado (n) mais a constante para essa s\u00e9rie.\u00a0Como resultado, a\u00a0<\/span><strong><span>s\u00e9rie de t\u00f3rio<\/span><\/strong><span>\u00a0\u00e9 conhecida como\u00a0<\/span><strong><span>s\u00e9rie 4n<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>A\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/\"><span>energia<\/span><\/a><span>\u00a0total\u00a0liberada do t\u00f3rio-232 para o chumbo-208, incluindo a energia perdida para os\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutrino\/\"><span>neutrinos<\/span><\/a><span>\u00a0, \u00e9 de 42,6 MeV.<\/span><\/p>\n<h3><span>Neptunium Series<\/span><\/h3>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neptunium-series-decay-chain.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25242 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neptunium-series-decay-chain-300x188.png\" alt=\"s\u00e9rie nept\u00fanio - cadeia de deteriora\u00e7\u00e3o\" width=\"300\" height=\"188\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/neptunium-series-decay-chain-300x188.png\" \/><\/a><span>A\u00a0<\/span><strong><span>s\u00e9rie de nept\u00fanio<\/span><\/strong><span>\u00a0\u00e9 uma s\u00e9rie radioativa iniciada com nept\u00fanio-237.\u00a0Seus membros s\u00e3o produzidos artificialmente por\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/nuclear-reactions\/\"><span>rea\u00e7\u00f5es nucleares<\/span><\/a><span>\u00a0e n\u00e3o ocorrem naturalmente,\u00a0<\/span><strong><span>porque a meia-vida do is\u00f3topo mais antigo da s\u00e9rie \u00e9 curta em compara\u00e7\u00e3o com a idade da Terra.\u00a0<\/span><\/strong><span>Essa cadeia de decaimento radioativo consiste em n\u00facleos at\u00f4micos pesados \u200b\u200be inst\u00e1veis, que\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/\"><span>decaem<\/span><\/a><span>\u00a0atrav\u00e9s de uma sequ\u00eancia de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">decaimentos\u00a0<\/a><\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\"><span>alfa<\/span><\/a><span>\u00a0e\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\"><span>beta<\/span><\/a><span>\u00a0at\u00e9 que um n\u00facleo est\u00e1vel seja alcan\u00e7ado.\u00a0No caso das s\u00e9ries de nept\u00fanios, o n\u00facleo est\u00e1vel \u00e9 o bismuto-209 (com meia-vida de 1,9E19 anos) e o t\u00e1lio-205.<\/span><\/p>\n<p><span>Como o\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\"><span>decaimento alfa<\/span><\/a><span>\u00a0representa a desintegra\u00e7\u00e3o de um\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/atomic-nucleus\/parent-nucleus-daughter-nucleus\/\"><span>n\u00facleo pai<\/span><\/a><span>\u00a0para uma filha atrav\u00e9s da emiss\u00e3o do n\u00facleo de um \u00e1tomo de h\u00e9lio (que cont\u00e9m quatro n\u00facleons), existem apenas quatro s\u00e9ries de decaimento.\u00a0Dentro de cada s\u00e9rie, portanto, o n\u00famero de massa dos membros pode ser expresso como quatro vezes um n\u00famero inteiro apropriado (n) mais a constante para essa s\u00e9rie.\u00a0Como resultado, a s\u00e9rie de nept\u00fanio \u00e9 conhecida como a\u00a0<\/span><strong><span>s\u00e9rie 4n + 1<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>A\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/\"><span>energia<\/span><\/a><span>\u00a0total\u00a0liberada do nept\u00fanio-237 ao t\u00e1lio-205, incluindo a energia perdida para os\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutrino\/\"><span>neutrinos<\/span><\/a><span>\u00a0, \u00e9 de 50,0 MeV.<\/span><\/p>\n<p><span>Em algum tipo de detector de fuma\u00e7a, voc\u00ea pode conhecer os radionucl\u00eddeos desta s\u00e9rie.\u00a0Os detectores de fuma\u00e7a por ioniza\u00e7\u00e3o geralmente usam um radiois\u00f3topo, geralmente\u00a0<\/span><strong><span>amer\u00edcio-241<\/span><\/strong><span>\u00a0, para ionizar o ar e detectar fuma\u00e7a.\u00a0Nesse caso, o americium-241 decai para o nept\u00fanio-237 e \u00e9, de fato, um membro da s\u00e9rie de nept\u00fanios.<\/span><\/p>\n<h3><span>S\u00e9rie de ur\u00e2nio<\/span><\/h3>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/uranium-series-decay-chain.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25239 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/uranium-series-decay-chain-300x171.png\" alt=\"s\u00e9rie de ur\u00e2nio - cadeia de deteriora\u00e7\u00e3o\" width=\"300\" height=\"171\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/uranium-series-decay-chain-300x171.png\" \/><\/a><span>A\u00a0<\/span><strong><span>s\u00e9rie de ur\u00e2nio<\/span><\/strong><span>\u00a0, tamb\u00e9m conhecida como s\u00e9rie de r\u00e1dio, \u00e9 uma das tr\u00eas s\u00e9ries radioativas cl\u00e1ssicas que come\u00e7am com o\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-238\/\"><span>ur\u00e2nio-238 que<\/span><\/a><span>\u00a0ocorre naturalmente\u00a0.\u00a0Essa cadeia de decaimento radioativo consiste em n\u00facleos at\u00f4micos pesados \u200b\u200be inst\u00e1veis, que\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/\"><span>decaem<\/span><\/a><span>\u00a0atrav\u00e9s de uma sequ\u00eancia de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">decaimentos\u00a0<\/a><\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\"><span>alfa<\/span><\/a><span>\u00a0e\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\"><span>beta<\/span><\/a><span>\u00a0at\u00e9 que um n\u00facleo est\u00e1vel seja alcan\u00e7ado.\u00a0No caso de s\u00e9ries de ur\u00e2nio, o n\u00facleo est\u00e1vel \u00e9 o chumbo-206.<\/span><\/p>\n<p><span>Como o\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\"><span>decaimento alfa<\/span><\/a><span>\u00a0representa a desintegra\u00e7\u00e3o de um\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/atomic-nucleus\/parent-nucleus-daughter-nucleus\/\"><span>n\u00facleo pai<\/span><\/a><span>\u00a0para uma filha atrav\u00e9s da emiss\u00e3o do n\u00facleo de um \u00e1tomo de h\u00e9lio (que cont\u00e9m quatro n\u00facleons), existem apenas quatro s\u00e9ries de decaimento.\u00a0Dentro de cada s\u00e9rie, portanto, o n\u00famero de massa dos membros pode ser expresso como quatro vezes um n\u00famero inteiro apropriado (n) mais a constante para essa s\u00e9rie.\u00a0Como resultado, a\u00a0<\/span><strong><span>s\u00e9rie de ur\u00e2nio<\/span><\/strong><span>\u00a0\u00e9 conhecida como s\u00e9rie\u00a0<\/span><strong><span>4n + 2<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>A\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/\"><span>energia<\/span><\/a><span>\u00a0total\u00a0liberada do ur\u00e2nio-238 para o chumbo-206, incluindo a energia perdida para os\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutrino\/\"><span>neutrinos<\/span><\/a><span>\u00a0, \u00e9 de 51,7 MeV.<\/span><\/p>\n<p><strong><span>S\u00e9rie de ur\u00e2nio e ur\u00e2nio-234<\/span><\/strong><\/p>\n<p><span>O is\u00f3topo de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-234\/\"><span>ur\u00e2nio-234<\/span><\/a><span>\u00a0\u00e9 um membro desta s\u00e9rie.\u00a0Esse is\u00f3topo tem meia-vida de apenas 2,46 x 10\u00a0<\/span><sup><span>5<\/span><\/sup><span>\u00a0anos e, portanto, n\u00e3o pertence a\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/glossary\/primordial-matter\/\"><span>nucl\u00eddeos primordiais<\/span><\/a><span>\u00a0(ao contr\u00e1rio de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-235\/\"><sup><span>235<\/span><\/sup><span>\u00a0U<\/span><\/a><span>\u00a0e\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-238\/\"><sup><span>238<\/span><\/sup><span>\u00a0U<\/span><\/a><span>\u00a0).\u00a0Por outro lado, este is\u00f3topo ainda est\u00e1 presente na crosta terrestre, mas isso \u00e9 devido ao fato de\u00a0<\/span><sup><span>234<\/span><\/sup><span>\u00a0U \u00e9 um\u00a0<\/span><strong><span>produto de decaimento indireta de\u00a0<\/span><\/strong><strong><sup><span>238<\/span><\/sup><\/strong><strong><span>\u00a0U<\/span><\/strong><span>\u00a0.\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\">Decad\u00eancias de\u00a0<\/a><\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-238\/\"><sup><span>238<\/span><\/sup><span>\u00a0U<\/span><\/a><span>\u00a0por\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\"><span>decaimento alfa<\/span><\/a><span>\u00a0em\u00a0<\/span><sup><span>234<\/span><\/sup><span>\u00a0U.\u00a0<\/span><sup><span>234<\/span><\/sup><span>U decai por decaimento alfa em 230Th, exceto uma fra\u00e7\u00e3o muito pequena (da ordem de ppm) de n\u00facleos que decai por fiss\u00e3o espont\u00e2nea.<\/span><\/p>\n<p><span>Em uma amostra natural de ur\u00e2nio, esses n\u00facleos est\u00e3o presentes nas propor\u00e7\u00f5es inalter\u00e1veis \u200b\u200bdo\u00a0<\/span><strong><span>equil\u00edbrio radioativo<\/span><\/strong><span>\u00a0da\u00a0filia\u00e7\u00e3o de\u00a0<\/span><sup><span>238<\/span><\/sup><span>\u00a0U na propor\u00e7\u00e3o de um \u00e1tomo de\u00a0<\/span><sup><span>234<\/span><\/sup><span>\u00a0U para cerca de 18 500 n\u00facleos de\u00a0<\/span><sup><span>238<\/span><\/sup><span>\u00a0U. Como resultado desse equil\u00edbrio, esses dois os is\u00f3topos (\u00a0<\/span><sup><span>238<\/span><\/sup><span>\u00a0U e\u00a0<\/span><sup><span>234<\/span><\/sup><span>\u00a0U) contribuem igualmente para a radioatividade do ur\u00e2nio natural.<\/span><\/p>\n<h3><span>S\u00e9rie Actinium<\/span><\/h3>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/actinium-series-decay-chain.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25240 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/actinium-series-decay-chain-300x190.png\" alt=\"s\u00e9rie actinium - cadeia de deteriora\u00e7\u00e3o\" width=\"300\" height=\"190\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/actinium-series-decay-chain-300x190.png\" \/><\/a><span>A\u00a0<\/span><strong><span>s\u00e9rie actinium<\/span><\/strong><span>\u00a0\u00e9 uma das tr\u00eas s\u00e9ries radioativas cl\u00e1ssicas come\u00e7ando com\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-fuel\/uranium\/uranium-235\/\"><span>ur\u00e2nio-235 que<\/span><\/a><span>\u00a0ocorre naturalmente\u00a0.\u00a0Essa cadeia de decaimento radioativo consiste em n\u00facleos at\u00f4micos pesados \u200b\u200be inst\u00e1veis, que\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/\"><span>decaem<\/span><\/a><span>\u00a0atrav\u00e9s de uma sequ\u00eancia de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">decaimentos\u00a0<\/a><\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/alpha-decay-alpha-radioactivity\/\"><span>alfa<\/span><\/a><span>\u00a0e\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\"><span>beta<\/span><\/a><span>\u00a0at\u00e9 que um n\u00facleo est\u00e1vel seja alcan\u00e7ado.\u00a0No caso de s\u00e9ries de act\u00ednio, o n\u00facleo est\u00e1vel \u00e9 o chumbo-207.<\/span><\/p>\n<p><span>Como o decaimento alfa representa a desintegra\u00e7\u00e3o de um\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/atomic-nucleus\/parent-nucleus-daughter-nucleus\/\"><span>n\u00facleo pai<\/span><\/a><span>\u00a0para uma filha atrav\u00e9s da emiss\u00e3o do n\u00facleo de um \u00e1tomo de h\u00e9lio (que cont\u00e9m quatro n\u00facleons), existem apenas quatro s\u00e9ries de decaimento.\u00a0Dentro de cada s\u00e9rie, portanto, o n\u00famero de massa dos membros pode ser expresso como quatro vezes um n\u00famero inteiro apropriado (n) mais a constante para essa s\u00e9rie.\u00a0Como resultado, a\u00a0<\/span><strong><span>s\u00e9rie actinium<\/span><\/strong><span>\u00a0\u00e9 conhecida como s\u00e9rie\u00a0<\/span><strong><span>4n + 3<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>A energia total liberada do ur\u00e2nio-235 para o chumbo-207, incluindo a energia perdida para os neutrinos, \u00e9 de 46,4 MeV.<\/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>Na f\u00edsica, uma cadeia de decaimento radioativo \u00e9 uma sequ\u00eancia de n\u00facleos at\u00f4micos inst\u00e1veis \u200b\u200be seus modos de decaimento, que levam a um n\u00facleo est\u00e1vel.\u00a0As fontes desses n\u00facleos inst\u00e1veis \u200b\u200bs\u00e3o diferentes, mas a maioria dos engenheiros lida com cadeias de decaimento radioativo que ocorrem naturalmente.\u00a0Dosimetria de Radia\u00e7\u00e3o Na f\u00edsica, uma\u00a0cadeia de decaimento radioativo\u00a0\u00e9 uma sequ\u00eancia &#8230; <a title=\"O que \u00e9 Cadeia de Decaimento Radioativo &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-cadeia-de-decaimento-radioativo-definicao\/\" aria-label=\"More on O que \u00e9 Cadeia de Decaimento Radioativo &#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 Cadeia de Decaimento Radioativo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Na f\u00edsica, uma cadeia de decaimento radioativo \u00e9 uma sequ\u00eancia de n\u00facleos at\u00f4micos inst\u00e1veis e seus modos de decaimento, que levam a um n\u00facleo est\u00e1vel. As fontes desses n\u00facleos inst\u00e1veis s\u00e3o diferentes, mas a maioria dos engenheiros lida com cadeias de decaimento radioativo que ocorrem naturalmente. 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-cadeia-de-decaimento-radioativo-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 Cadeia de Decaimento Radioativo - Defini\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Na f\u00edsica, uma cadeia de decaimento radioativo \u00e9 uma sequ\u00eancia de n\u00facleos at\u00f4micos inst\u00e1veis e seus modos de decaimento, que levam a um n\u00facleo est\u00e1vel. As fontes desses n\u00facleos inst\u00e1veis s\u00e3o diferentes, mas a maioria dos engenheiros lida com cadeias de decaimento radioativo que ocorrem naturalmente. 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