{"id":18099,"date":"2020-06-26T22:47:26","date_gmt":"2020-06-26T22:47:26","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-coeficiente-de-conversao-interna-icc-definicao\/"},"modified":"2020-07-24T06:18:42","modified_gmt":"2020-07-24T06:18:42","slug":"o-que-e-coeficiente-de-conversao-interna-icc-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-coeficiente-de-conversao-interna-icc-definicao\/","title":{"rendered":"O que \u00e9 coeficiente de convers\u00e3o interna – ICC – Defini\u00e7\u00e3o"},"content":{"rendered":"
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O coeficiente de convers\u00e3o interna (ICC), \u03b1, caracteriza a competi\u00e7\u00e3o entre convers\u00e3o interna e emiss\u00e3o de raios gama.\u00a0Em alguns casos, a convers\u00e3o interna \u00e9 preferida ao decaimento gama.\u00a0Dosimetria de Radia\u00e7\u00e3o<\/div>\n<\/div>\n
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\"Convers\u00e3o<\/a>
Convers\u00e3o interna seguida por emiss\u00e3o de el\u00e9trons Auger.<\/figcaption><\/figure>\n

A convers\u00e3o interna<\/strong>\u00a0\u00e9 um processo eletromagn\u00e9tico, pelo qual um estado nuclear excitado decai pela\u00a0emiss\u00e3o direta<\/strong>\u00a0de um de seus\u00a0el\u00e9trons at\u00f4micos<\/strong>\u00a0.\u00a0A convers\u00e3o interna<\/strong>\u00a0compete com\u00a0a emiss\u00e3o gama<\/a>\u00a0, mas, neste caso, os campos multipolares eletromagn\u00e9ticos do\u00a0n\u00facleo<\/a>\u00a0n\u00e3o resultam na emiss\u00e3o de um raio gama; em vez disso, os campos interagem diretamente com os el\u00e9trons at\u00f4micos.<\/p>\n

Coeficiente de convers\u00e3o interna<\/h2>\n

O\u00a0coeficiente de convers\u00e3o interna<\/strong>\u00a0(ICC),\u00a0\u03b1<\/strong>\u00a0, caracteriza a competi\u00e7\u00e3o entre convers\u00e3o interna e emiss\u00e3o de raios gama.\u00a0Em alguns casos, a convers\u00e3o interna \u00e9 preferida ao decaimento gama.\u00a0Em outros, pode ser completamente insignificante.\u00a0O\u00a0coeficiente de convers\u00e3o interno<\/strong>\u00a0\u00e9 definido como a raz\u00e3o entre o n\u00famero de decaimentos de convers\u00e3o internos e o n\u00famero de decaimentos gama.\u00a0Essa CCI \u00e9 definida para cada inv\u00f3lucro de el\u00e9trons (ou seja, os inv\u00f3lucros K, L e M, etc), de modo que a raz\u00e3o total, \u03b1\u00a0total<\/sub>\u00a0, seja a soma dos ICCs para cada inv\u00f3lucro como:<\/p>\n

ct\u00a0totais<\/sub>\u00a0= ct\u00a0K<\/sub>\u00a0+ \u03b1\u00a0G<\/sub>\u00a0+ \u03b1\u00a0H<\/sub>\u00a0= n\u00famero de IC \/ n\u00famero de decaimentos gamma<\/p>\n

Por exemplo, no decaimento do estado excitado a 35 keV de\u00a0125<\/sup>\u00a0Te (produzido pelo decaimento de 125I), 7% dos decaimentos emitem raios gama, enquanto 93% emitem el\u00e9trons de convers\u00e3o.\u00a0Portanto, um coeficiente de convers\u00e3o interno desse estado excitado (\u00a0125<\/sup>\u00a0Te) \u00e9 ICC = 93\/7 = 13,3.<\/p>\n

Usando a calculadora do Coeficiente de Convers\u00e3o Interna Band-Raman, os ICCs podem ser calculados usando princ\u00edpios da f\u00edsica at\u00f4mica, uma vez que depende principalmente da densidade dos el\u00e9trons at\u00f4micos no centro do n\u00facleo.\u00a0Para aumentar o n\u00famero at\u00f4mico (Z) e diminuir a energia dos raios gama, observa-se um aumento nos coeficientes de convers\u00e3o internos.<\/p>\n<\/div>\n<\/div>\n

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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":"

O coeficiente de convers\u00e3o interna (ICC), \u03b1, caracteriza a competi\u00e7\u00e3o entre convers\u00e3o interna e emiss\u00e3o de raios gama.\u00a0Em alguns casos, a convers\u00e3o interna \u00e9 preferida ao decaimento gama.\u00a0Dosimetria de Radia\u00e7\u00e3o Convers\u00e3o interna seguida por emiss\u00e3o de el\u00e9trons Auger. A convers\u00e3o interna\u00a0\u00e9 um processo eletromagn\u00e9tico, pelo qual um estado nuclear excitado decai pela\u00a0emiss\u00e3o direta\u00a0de um de … 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":"\nO que \u00e9 coeficiente de convers\u00e3o interna - ICC - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O coeficiente de convers\u00e3o interna (ICC), \u03b1, caracteriza a competi\u00e7\u00e3o entre convers\u00e3o interna e emiss\u00e3o de raios gama. Em alguns casos, a convers\u00e3o interna \u00e9 preferida ao decaimento gama. 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