{"id":18266,"date":"2020-06-27T21:12:24","date_gmt":"2020-06-27T21:12:24","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-metade-da-camada-de-valor-definicao\/"},"modified":"2020-07-24T10:52:32","modified_gmt":"2020-07-24T10:52:32","slug":"o-que-e-metade-da-camada-de-valor-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-metade-da-camada-de-valor-definicao\/","title":{"rendered":"O que \u00e9 metade da camada de valor &#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 camada de metade do valor expressa a espessura do material absorvente necess\u00e1rio para reduzir a intensidade da radia\u00e7\u00e3o incidente por um fator de dois.\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<h2>Camada de metade do valor<\/h2>\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><span>A camada de meio valor expressa a espessura do material absorvente necess\u00e1rio para reduzir a intensidade da radia\u00e7\u00e3o incidente por um\u00a0<\/span><strong><span>fator de dois<\/span><\/strong><span>\u00a0.\u00a0Existem duas caracter\u00edsticas principais da camada de meio valor:<\/span><\/p>\n<ul>\n<li><span>A\u00a0<\/span><b><span>camada de metade do valor<\/span><\/b><span>\u00a0diminui \u00e0 medida que o n\u00famero at\u00f4mico do absorvedor aumenta.\u00a0Por exemplo, s\u00e3o necess\u00e1rios 35 m de ar para reduzir a intensidade de um feixe de raios gama de 100 keV por um fator de dois, enquanto apenas 0,12 mm de chumbo podem fazer a mesma coisa.<\/span><\/li>\n<li><span>A\u00a0<\/span><b><span>camada de metade do valor<\/span><\/b><span>\u00a0para todos os materiais aumenta com a energia dos raios gama.\u00a0Por exemplo, de 0,26 cm para ferro a 100 keV a cerca de 1,06 cm a 500 keV.<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/half-value-layers.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-12759 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/extrinsic-doped-semiconductor-p-type-acceptor-300x206.png\" alt=\"meia camada de valor\" width=\"291\" height=\"300\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/extrinsic-doped-semiconductor-p-type-acceptor-300x206.png\" \/><\/a><\/p>\n<div class=\"su-spacer\"><\/div>\n<p><span>A camada de meio valor expressa a espessura do material absorvente necess\u00e1rio para reduzir a intensidade da radia\u00e7\u00e3o incidente por um fator de dois.\u00a0Com meia camada de valor, \u00e9 f\u00e1cil realizar c\u00e1lculos simples.<\/span><br \/>\n<span>Fonte: www.nde-ed.org<\/span><\/p>\n<div class=\"su-spacer\"><\/div>\n<p><strong><span>Tabela de camadas de meio valor<\/span><\/strong><span>\u00a0(em cm) para diferentes materiais com energias de raios gama de 100, 200 e 500 keV.<\/span><\/p>\n<table rules=\"rows\">\n<tbody>\n<tr>\n<td><span>Absorvedor<\/span><\/td>\n<td><span>100 keV<\/span><\/td>\n<td><span>200 keV<\/span><\/td>\n<td><span>500 keV<\/span><\/td>\n<\/tr>\n<tr>\n<td><span>Ar<\/span><\/td>\n<td><span>3555 cm<\/span><\/td>\n<td><span>4359 cm<\/span><\/td>\n<td><span>6189 cm<\/span><\/td>\n<\/tr>\n<tr>\n<td><span>\u00c1gua<\/span><\/td>\n<td><span>4,15 cm<\/span><\/td>\n<td><span>5.1 cm<\/span><\/td>\n<td><span>7.15 cm<\/span><\/td>\n<\/tr>\n<tr>\n<td><span>Carbono<\/span><\/td>\n<td><span>2,07 cm<\/span><\/td>\n<td><span>2,53 cm<\/span><\/td>\n<td><span>3.54 cm<\/span><\/td>\n<\/tr>\n<tr>\n<td><span>Alum\u00ednio<\/span><\/td>\n<td><span>1,59 cm<\/span><\/td>\n<td><span>2,14 cm<\/span><\/td>\n<td><span>3.05 cm<\/span><\/td>\n<\/tr>\n<tr>\n<td><span>Ferro<\/span><\/td>\n<td><span>0,26 cm<\/span><\/td>\n<td><span>0,64 cm<\/span><\/td>\n<td><span>1.06 cm<\/span><\/td>\n<\/tr>\n<tr>\n<td><span>Cobre<\/span><\/td>\n<td><span>0,18 cm<\/span><\/td>\n<td><span>0,53 cm<\/span><\/td>\n<td><span>0,95 cm<\/span><\/td>\n<\/tr>\n<tr>\n<td><span>Conduzir<\/span><\/td>\n<td><span>\u00a00.012 cm<\/span><\/td>\n<td><span>\u00a00.068 cm<\/span><\/td>\n<td><span>\u00a00,42 cm<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<h2><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\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 camada de metade do valor expressa a espessura do material absorvente necess\u00e1rio para reduzir a intensidade da radia\u00e7\u00e3o incidente por um fator de dois.\u00a0Dosimetria de Radia\u00e7\u00e3o Camada de metade do valor A camada de meio valor expressa a espessura do material absorvente necess\u00e1rio para reduzir a intensidade da radia\u00e7\u00e3o incidente por um\u00a0fator de dois\u00a0.\u00a0Existem &#8230; <a title=\"O que \u00e9 metade da camada de valor &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-metade-da-camada-de-valor-definicao\/\" aria-label=\"More on O que \u00e9 metade da camada de valor &#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 metade da camada de valor - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A camada de metade do valor expressa a espessura do material absorvente necess\u00e1rio para reduzir a intensidade da radia\u00e7\u00e3o incidente por um fator de dois. 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