{"id":18015,"date":"2020-06-25T00:05:04","date_gmt":"2020-06-25T00:05:04","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-datacao-radiometrica-datacao-radioativa-definicao\/"},"modified":"2020-07-23T07:14:24","modified_gmt":"2020-07-23T07:14:24","slug":"o-que-e-datacao-radiometrica-datacao-radioativa-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-datacao-radiometrica-datacao-radioativa-definicao\/","title":{"rendered":"O que \u00e9 data\u00e7\u00e3o radiom\u00e9trica &#8211; data\u00e7\u00e3o radioativa &#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\">A data\u00e7\u00e3o radiom\u00e9trica (ou data\u00e7\u00e3o radioativa) \u00e9 qualquer t\u00e9cnica usada para datar materiais org\u00e2nicos e tamb\u00e9m inorg\u00e2nicos de um processo que envolve decaimento radioativo.\u00a0Os m\u00e9todos de data\u00e7\u00e3o radiom\u00e9trica s\u00e3o usados \u200b\u200bna geocronologia para estabelecer a escala de tempo geol\u00f3gico.\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>A data\u00e7\u00e3o radiom\u00e9trica<\/strong>\u00a0(ou data\u00e7\u00e3o radioativa) \u00e9 qualquer t\u00e9cnica usada para datar materiais org\u00e2nicos e tamb\u00e9m inorg\u00e2nicos de um processo que envolve\u00a0<strong>decaimento radioativo<\/strong>\u00a0.\u00a0O m\u00e9todo compara a abund\u00e2ncia de um is\u00f3topo radioativo de ocorr\u00eancia natural dentro do material com a abund\u00e2ncia de seus produtos de decomposi\u00e7\u00e3o, que se formam a uma taxa constante conhecida de decomposi\u00e7\u00e3o.<\/p>\n<p>Todos esses m\u00e9todos se baseiam no fato de a taxa na qual os n\u00facleos radioativos se desintegram n\u00e3o serem afetados pelo ambiente, podendo ser usados \u200b\u200bpara estimar a idade de qualquer amostra ou objeto material que contenha um is\u00f3topo radioativo.\u00a0Os c\u00e1lculos do decaimento dos n\u00facleos radioativos s\u00e3o relativamente diretos, devido ao fato de haver apenas uma lei fundamental que governa todo o processo de decaimento.<\/p>\n<p>A\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/\"><strong>lei de decaimento radioativo<\/strong><\/a>\u00a0afirma que a probabilidade por unidade de tempo que um n\u00facleo decair\u00e1 \u00e9 uma constante, independente do tempo.\u00a0Essa constante \u00e9 chamada\u00a0<strong>constante de decaimento<\/strong>\u00a0e \u00e9 denotada por \u03bb, &#8220;lambda&#8221;.\u00a0Essa probabilidade constante pode variar muito entre os diferentes tipos de n\u00facleos, levando a muitas taxas diferentes de decaimento observadas.\u00a0O decaimento radioativo de certo n\u00famero de \u00e1tomos (massa) \u00e9 exponencial no tempo.<\/p>\n<p><strong>Lei decaimento radioativo: N = N\u00a0<\/strong><strong><sub>0<\/sub><\/strong><strong>\u00a0.e\u00a0<\/strong><strong><sup>-\u03bbt<\/sup><\/strong><\/p>\n<p>Entre as t\u00e9cnicas mais conhecidas est\u00e3o:<\/p>\n<ul>\n<li><strong>namoro carbono-14,<\/strong><\/li>\n<li><strong>data\u00e7\u00e3o por pot\u00e1ssio-arg\u00f4nio,<\/strong><\/li>\n<li><strong>namoro com ur\u00e2nio e chumbo<\/strong>\u00a0.<\/li>\n<\/ul>\n<p><strong>Os m\u00e9todos de data\u00e7\u00e3o radiom\u00e9trica<\/strong>\u00a0s\u00e3o usados \u200b\u200bna\u00a0<strong>geocronologia<\/strong>\u00a0para estabelecer a escala de tempo geol\u00f3gico e tamb\u00e9m podem ser usados \u200b\u200bpara datar\u00a0<strong>materiais arqueol\u00f3gicos<\/strong>\u00a0, incluindo\u00a0<strong>artefatos antigos<\/strong>\u00a0.<\/p>\n<h2>Data\u00e7\u00e3o por carbono-14 &#8211; Data\u00e7\u00e3o por radiocarbono<\/h2>\n<p><strong>A data\u00e7\u00e3o por carbono-14<\/strong>\u00a0, tamb\u00e9m conhecida como\u00a0<strong>data\u00e7\u00e3o<\/strong>\u00a0por\u00a0<strong>radiocarbono<\/strong>\u00a0, \u00e9 um m\u00e9todo para determinar a idade de um objeto contendo\u00a0<strong>material org\u00e2nico,<\/strong>\u00a0usando as propriedades do radionucl\u00eddeo de carbono-14.\u00a0O carbono radioativo-14 tem\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>5730 anos<\/strong>\u00a0e sofre\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\"><strong>decaimento \u03b2<\/strong><\/a>\u00a0, onde o\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\">n\u00eautron<\/a>\u00a0\u00e9 convertido em\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/what-is-proton-properties-of-proton\/\">pr\u00f3ton<\/a>\u00a0,\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/what-is-electron-properties-of-electron\/\">el\u00e9tron<\/a>\u00a0e\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/antineutrino\/\">antineutrino<\/a>\u00a0:<\/p>\n<figure id=\"attachment_11688\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-11688\"><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Beta_Minus_Decay.png\"><img loading=\"lazy\" class=\"wp-image-11688 size-full lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Beta_Minus_Decay.png\" alt=\"decaimento beta - data\u00e7\u00e3o por carbono-14\" width=\"668\" height=\"178\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Beta_Minus_Decay.png\" \/><\/a><figcaption id=\"caption-attachment-11688\" class=\"wp-caption-text\">Decaimento beta do n\u00facleo C-14.<\/figcaption><\/figure>\n<p><span>Apesar dessa meia-vida curta em compara\u00e7\u00e3o com a idade da Terra, o carbono-14 \u00e9 um is\u00f3topo que ocorre naturalmente.\u00a0Sua presen\u00e7a pode ser explicada pela seguinte observa\u00e7\u00e3o simples.\u00a0Nossa\u00a0<\/span><strong><span>atmosfera<\/span><\/strong><span>\u00a0cont\u00e9m muitos gases, incluindo o nitrog\u00eanio-14.\u00a0Al\u00e9m disso, a atmosfera \u00e9 constantemente bombardeada com\u00a0<\/span><strong><span>raios c\u00f3smicos de alta energia<\/span><\/strong><span>\u00a0, consistindo de pr\u00f3tons, n\u00facleos mais pesados \u200b\u200bou raios gama.\u00a0Esses raios c\u00f3smicos interagem com os n\u00facleos da atmosfera e tamb\u00e9m produzem n\u00eautrons de alta energia.\u00a0Esses n\u00eautrons produzidos nessas colis\u00f5es podem ser absorvidos pelo nitrog\u00eanio-14 para produzir um is\u00f3topo de carbono-14:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/carbon-14-dating-formation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25290 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/carbon-14-dating-formation.png\" alt=\"data\u00e7\u00e3o por carbono-14 - forma\u00e7\u00e3o\" width=\"196\" height=\"41\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/carbon-14-dating-formation.png\" \/><\/a><\/p>\n<p><strong><span>O carbono-14<\/span><\/strong><span>\u00a0tamb\u00e9m pode ser produzido na atmosfera por outras rea\u00e7\u00f5es de n\u00eautrons, incluindo em particular 13C (n, \u03b3) 14C e 17O (n, \u03b1) 14C.\u00a0Como resultado, o\u00a0<\/span><strong><span>carbono-14<\/span><\/strong><span>\u00a0\u00e9 formado continuamente na atmosfera superior pela intera\u00e7\u00e3o dos raios c\u00f3smicos com o nitrog\u00eanio atmosf\u00e9rico.\u00a0Em m\u00e9dia, apenas um em cada 1,3 x 10\u00a0<\/span><sup><span>12<\/span><\/sup><span>\u00a0\u00e1tomos de carbono na atmosfera \u00e9 um \u00e1tomo de carbono-14 radioativo.<\/span><\/p>\n<p><span>O carbono-14 resultante combina-se com o oxig\u00eanio atmosf\u00e9rico para formar\u00a0<\/span><strong><span>di\u00f3xido de carbono radioativo<\/span><\/strong><span>, que \u00e9 incorporado nas plantas por fotoss\u00edntese.\u00a0Consequentemente, todos os sistemas biol\u00f3gicos como plantas, animais e seres humanos cont\u00eam um certo n\u00edvel de carbono radioativo-14.\u00a0Enquanto o sistema biol\u00f3gico estiver vivo, o n\u00edvel \u00e9 constante devido \u00e0 ingest\u00e3o constante de todos os is\u00f3topos de carbono.\u00a0Quando o sistema biol\u00f3gico morre, ele para de trocar carbono com o meio ambiente e, a partir desse momento, a quantidade de carbono-14 que ele cont\u00e9m come\u00e7a a diminuir \u00e0 medida que o carbono-14 sofre decaimento radioativo.\u00a0Por outro lado, a quantidade de carbono-12 est\u00e1vel permanece inalterada.\u00a0Como resultado, a concentra\u00e7\u00e3o relativa desses dois is\u00f3topos em qualquer organismo muda ap\u00f3s sua morte.\u00a0O m\u00e9todo permite que as data\u00e7\u00f5es sejam feitas at\u00e9 cerca de 20.000 anos atr\u00e1s, com uma precis\u00e3o de cerca de \u00b1 100 anos.<\/span><\/p>\n<p><span>A t\u00e9cnica de data\u00e7\u00e3o por carbono foi sugerida inicialmente por\u00a0<\/span><strong><span>Willard Libby<\/span><\/strong><span>\u00a0e seus colegas em 1949. Em 1960, Willard Libby recebeu o Pr\u00eamio Nobel de qu\u00edmica por este trabalho.<\/span><\/p>\n<h2><span>Era da Terra &#8211; Namoro com ur\u00e2nio<\/span><\/h2>\n<p><span>A\u00a0<\/span><strong><span>idade da Terra<\/span><\/strong><span>\u00a0\u00e9 de cerca de\u00a0<\/span><strong><span>4,54 bilh\u00f5es de anos<\/span><\/strong><span>\u00a0.\u00a0Essa data\u00e7\u00e3o \u00e9 baseada em evid\u00eancias de data\u00e7\u00e3o por idade radiom\u00e9trica de material meteorito e \u00e9 consistente com as idades radiom\u00e9tricas das amostras terrestres e lunares mais antigas conhecidas.<\/span><\/p>\n<p><span>Um dos m\u00e9todos mais antigos de data\u00e7\u00e3o radiom\u00e9trica \u00e9 a data\u00e7\u00e3o por\u00a0<\/span><strong><span>ur\u00e2nio com chumbo<\/span><\/strong><span>\u00a0.\u00a0A idade da crosta terrestre pode ser estimada a partir da raz\u00e3o entre as quantidades de ur\u00e2nio-238 e chumbo-206 encontradas em esp\u00e9cimes geol\u00f3gicos.\u00a0A meia-vida longa do is\u00f3topo\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(4,51 \u00d7 10\u00a0<\/span><sup><span>9<\/span><\/sup><span>\u00a0anos) o torna adequado para uso na estimativa da idade das primeiras rochas \u00edgneas e para outros tipos de data\u00e7\u00e3o radiom\u00e9trica, incluindo data\u00e7\u00e3o ur\u00e2nio-t\u00f3rio e ur\u00e2nio &#8211; namoro de ur\u00e2nio.<\/span><\/p>\n<p><strong><span>A data\u00e7\u00e3o por ur\u00e2nio com chumbo<\/span><\/strong><span>\u00a0\u00e9 baseada na medi\u00e7\u00e3o do\u00a0<\/span><strong><span>primeiro<\/span><\/strong><span>\u00a0e do\u00a0<\/span><strong><span>\u00faltimo membro<\/span><\/strong><span>\u00a0da\u00a0<\/span><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\/\"><span>s\u00e9rie de ur\u00e2nio<\/span><\/a><\/strong><span>\u00a0, que \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 \u200b\u200bque\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>at\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.\u00a0A suposi\u00e7\u00e3o feita \u00e9 que todos os n\u00facleos de chumbo-206 encontrados no esp\u00e9cime hoje eram originalmente n\u00facleos de ur\u00e2nio-238.\u00a0Isso significa que, na forma\u00e7\u00e3o da crosta, o esp\u00e9cime n\u00e3o continha n\u00facleos de chumbo-206.\u00a0Se nenhum outro is\u00f3topo de chumbo for encontrado na amostra, essa \u00e9 uma suposi\u00e7\u00e3o razo\u00e1vel.\u00a0Sob essa condi\u00e7\u00e3o, a idade da amostra pode ser calculada assumindo decaimento exponencial de ur\u00e2nio-238.\u00a0Isso \u00e9:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/uranium-lead-method-age-of-the-Earth.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25289 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/uranium-lead-method-age-of-the-Earth.png\" alt=\"m\u00e9todo de ur\u00e2nio-chumbo - idade da Terra\" width=\"599\" height=\"171\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/uranium-lead-method-age-of-the-Earth.png\" \/><\/a><\/p>\n<p><strong><span>O<\/span><\/strong><span>\u00a0m\u00e9todo de\u00a0<strong>data\u00e7\u00e3o por ur\u00e2nio e chumbo<\/strong>\u00a0\u00e9 geralmente realizado no\u00a0<\/span><strong><span>zirc\u00e3o mineral<\/span><\/strong><span>\u00a0.\u00a0Os zirc\u00f5es de Jack Hills, na Austr\u00e1lia Ocidental, produziram idades de U-Pb de at\u00e9\u00a0<\/span><strong><span>4,404 bilh\u00f5es de anos<\/span><\/strong><span>\u00a0, interpretadas como a era da cristaliza\u00e7\u00e3o, tornando-os os minerais mais antigos at\u00e9 agora datados da Terra.<\/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>A data\u00e7\u00e3o radiom\u00e9trica (ou data\u00e7\u00e3o radioativa) \u00e9 qualquer t\u00e9cnica usada para datar materiais org\u00e2nicos e tamb\u00e9m inorg\u00e2nicos de um processo que envolve decaimento radioativo.\u00a0Os m\u00e9todos de data\u00e7\u00e3o radiom\u00e9trica s\u00e3o usados \u200b\u200bna geocronologia para estabelecer a escala de tempo geol\u00f3gico.\u00a0Dosimetria de Radia\u00e7\u00e3o A data\u00e7\u00e3o radiom\u00e9trica\u00a0(ou data\u00e7\u00e3o radioativa) \u00e9 qualquer t\u00e9cnica usada para datar materiais org\u00e2nicos e &#8230; <a title=\"O que \u00e9 data\u00e7\u00e3o radiom\u00e9trica &#8211; data\u00e7\u00e3o radioativa &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-datacao-radiometrica-datacao-radioativa-definicao\/\" aria-label=\"More on O que \u00e9 data\u00e7\u00e3o radiom\u00e9trica &#8211; data\u00e7\u00e3o radioativa &#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 data\u00e7\u00e3o radiom\u00e9trica - data\u00e7\u00e3o radioativa - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A data\u00e7\u00e3o radiom\u00e9trica (ou data\u00e7\u00e3o radioativa) \u00e9 qualquer t\u00e9cnica usada para datar materiais org\u00e2nicos e tamb\u00e9m inorg\u00e2nicos de um processo que envolve decaimento radioativo. Os m\u00e9todos de data\u00e7\u00e3o radiom\u00e9trica s\u00e3o usados na geocronologia para estabelecer a escala de tempo geol\u00f3gico. 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=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-datacao-radiometrica-datacao-radioativa-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 data\u00e7\u00e3o radiom\u00e9trica - data\u00e7\u00e3o radioativa - defini\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"A data\u00e7\u00e3o radiom\u00e9trica (ou data\u00e7\u00e3o radioativa) \u00e9 qualquer t\u00e9cnica usada para datar materiais org\u00e2nicos e tamb\u00e9m inorg\u00e2nicos de um processo que envolve decaimento radioativo. Os m\u00e9todos de data\u00e7\u00e3o radiom\u00e9trica s\u00e3o usados na geocronologia para estabelecer a escala de tempo geol\u00f3gico. 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