{"id":18270,"date":"2020-06-27T23:09:39","date_gmt":"2020-06-27T23:09:39","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-blindagem-da-radiacao-alfa-definicao\/"},"modified":"2020-07-24T11:04:42","modified_gmt":"2020-07-24T11:04:42","slug":"o-que-e-blindagem-da-radiacao-alfa-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-blindagem-da-radiacao-alfa-definicao\/","title":{"rendered":"O que \u00e9 blindagem da radia\u00e7\u00e3o alfa &#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 blindagem da radia\u00e7\u00e3o alfa sozinha n\u00e3o representa um problema dif\u00edcil. A maioria das part\u00edculas alfa pode ser facilmente parada por um peda\u00e7o de papel fino. Dosimetria de Radia\u00e7\u00e3o<\/div>\n<\/div>\n<div><\/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\"><\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<h2><span>Blindagem da radia\u00e7\u00e3o alfa<\/span><\/h2>\n<p><span>Os seguintes recursos das part\u00edculas alfa s\u00e3o cruciais em sua blindagem.<\/span><\/p>\n<ul>\n<li><a title=\"Alpha Particle\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\"><strong><span>As part\u00edculas alfa<\/span><\/strong><\/a><span>\u00a0s\u00e3o<\/span><strong><span>\u00a0n\u00facleos<\/span><\/strong><span>\u00a0energ\u00e9ticos<strong>\u00a0de h\u00e9lio<\/strong>\u00a0e s\u00e3o relativamente pesadas e carregam uma<\/span><strong><span>\u00a0carga positiva dupla<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>As part\u00edculas alfa\u00a0<\/span><a title=\"Intera\u00e7\u00e3o de part\u00edculas carregadas pesadas com mat\u00e9ria\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-heavy-charged-particles\/\"><span>interagem com a mat\u00e9ria<\/span><\/a><span>\u00a0principalmente atrav\u00e9s de\u00a0<\/span><strong><span>for\u00e7as coulombianas<\/span><\/strong><span>\u00a0\u00a0(ioniza\u00e7\u00e3o e excita\u00e7\u00e3o da mat\u00e9ria) entre sua carga positiva e a carga negativa dos el\u00e9trons dos orbitais at\u00f4micos.<\/span><\/li>\n<li><span>As part\u00edculas alfa\u00a0<\/span><strong><span>ionizam fortemente a mat\u00e9ria<\/span><\/strong><span>\u00a0e rapidamente perdem sua energia cin\u00e9tica.\u00a0Por outro lado, eles depositam todas as suas energias ao longo de seus caminhos curtos.<\/span><\/li>\n<li><span>O poder de parada \u00e9 bem descrito pela\u00a0<\/span><a title=\"Poder de parada - Bethe Formula\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-heavy-charged-particles\/stopping-power-bethe-formula\/\"><span>f\u00f3rmula de Bethe<\/span><\/a><span>\u00a0.<\/span><\/li>\n<\/ul>\n<p><span>O poder de parada da maioria dos materiais \u00e9 muito alto para part\u00edculas alfa e part\u00edculas carregadas pesadas.\u00a0Portanto, part\u00edculas alfa t\u00eam\u00a0<\/span><strong><span>faixas muito curtas<\/span><\/strong><span>\u00a0.\u00a0Por exemplo, os intervalos de uma part\u00edcula alfa de 5 MeV (a maioria possui essa energia inicial) s\u00e3o de aproximadamente 0,002 cm em liga de alum\u00ednio ou aproximadamente 3,5 cm no ar.\u00a0A maioria das part\u00edculas alfa pode ser parada por um\u00a0<\/span><strong><span>\u00a0peda\u00e7o de papel fino.\u00a0At\u00e9 as c\u00e9lulas mortas na camada externa da pele humana fornecem prote\u00e7\u00e3o adequada, porque as part\u00edculas alfa n\u00e3o conseguem penetr\u00e1-la.\u00a0<\/span><\/strong><\/p>\n<p><span>Portanto, a blindagem da radia\u00e7\u00e3o alfa por si s\u00f3 n\u00e3o representa um problema dif\u00edcil.\u00a0Por outro lado, os nucl\u00eddeos radioativos alfa podem levar a s\u00e9rios riscos \u00e0 sa\u00fade quando ingeridos ou inalados (contamina\u00e7\u00e3o interna).\u00a0Quando s\u00e3o ingeridas ou inaladas, as part\u00edculas alfa de sua decomposi\u00e7\u00e3o prejudicam significativamente o tecido vivo interno.\u00a0Al\u00e9m disso, a radia\u00e7\u00e3o alfa pura \u00e9 muito rara, o decaimento alfa \u00e9 frequentemente acompanhado por radia\u00e7\u00e3o gama, cuja prote\u00e7\u00e3o \u00e9 outro problema.<\/span><\/p>\n<p><span>Vide tamb\u00e9m:\u00a0<\/span><a title=\"Intera\u00e7\u00e3o de part\u00edculas carregadas pesadas com mat\u00e9ria\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-heavy-charged-particles\/\"><span>Intera\u00e7\u00e3o de part\u00edculas carregadas pesadas com mat\u00e9ria<\/span><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\">\n<figure id=\"attachment_11672\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-11672\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Alpha_particle_cloud_chamber.jpg\"><img loading=\"lazy\" class=\"size-medium wp-image-11672 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Alpha_particle_cloud_chamber-300x156.jpg\" alt=\"Alpha Particle - Cloud Chamber\" width=\"300\" height=\"156\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Alpha_particle_cloud_chamber-300x156.jpg\" \/><\/a><figcaption id=\"caption-attachment-11672\" class=\"wp-caption-text\"><span>Part\u00edculas alfa e el\u00e9trons (desviados por um campo magn\u00e9tico) de uma haste de t\u00f3rio em uma c\u00e2mara de nuvens.<\/span><br \/>\n<span>Fonte: wikipedia.org<\/span><\/figcaption><\/figure>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/shielding_alpha_beta.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-12728 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/shielding_alpha_beta-300x250.png\" alt=\"Blindagem da radia\u00e7\u00e3o alfa e beta\" width=\"300\" height=\"250\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/shielding_alpha_beta-300x250.png\" \/><\/a><\/p>\n<div class=\"su-spacer\"><\/div>\n<div class=\"su-spacer\"><\/div>\n<p><span>Materiais b\u00e1sicos para blindagem de part\u00edculas alfa.<\/span><\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-default\"><\/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\"><\/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 \">\n<div class=\"inside-grid-column\"><\/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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A blindagem da radia\u00e7\u00e3o alfa sozinha n\u00e3o representa um problema dif\u00edcil. A maioria das part\u00edculas alfa pode ser facilmente parada por um peda\u00e7o de papel fino. Dosimetria de Radia\u00e7\u00e3o Blindagem da radia\u00e7\u00e3o alfa Os seguintes recursos das part\u00edculas alfa s\u00e3o cruciais em sua blindagem. As part\u00edculas alfa\u00a0s\u00e3o\u00a0n\u00facleos\u00a0energ\u00e9ticos\u00a0de h\u00e9lio\u00a0e s\u00e3o relativamente pesadas e carregam uma\u00a0carga positiva &#8230; <a title=\"O que \u00e9 blindagem da radia\u00e7\u00e3o alfa &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-blindagem-da-radiacao-alfa-definicao\/\" aria-label=\"More on O que \u00e9 blindagem da radia\u00e7\u00e3o alfa &#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 blindagem da radia\u00e7\u00e3o alfa - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A blindagem da radia\u00e7\u00e3o alfa sozinha n\u00e3o representa um problema dif\u00edcil. 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