{"id":18217,"date":"2020-06-27T10:44:40","date_gmt":"2020-06-27T10:44:40","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-radiacao-alfa-definicao\/"},"modified":"2020-07-24T10:28:05","modified_gmt":"2020-07-24T10:28:05","slug":"o-que-e-radiacao-alfa-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-radiacao-alfa-definicao\/","title":{"rendered":"O que \u00e9 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 radia\u00e7\u00e3o alfa consiste em part\u00edculas alfa, que s\u00e3o n\u00facleos energ\u00e9ticos de h\u00e9lio. A produ\u00e7\u00e3o de radia\u00e7\u00e3o alfa \u00e9 denominada decaimento alfa. A prote\u00e7\u00e3o da radia\u00e7\u00e3o alfa n\u00e3o representa um problema dif\u00edcil. 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\">\n<h2><span>Formas de radia\u00e7\u00e3o ionizante<\/span><\/h2>\n<figure id=\"attachment_317\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-317\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Alfa_beta_gamma_neutron_radiation.png\"><img loading=\"lazy\" class=\"size-medium wp-image-317 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Alfa_beta_gamma_neutron_radiation-174x300.png\" alt=\"Intera\u00e7\u00e3o da radia\u00e7\u00e3o com a mat\u00e9ria\" width=\"174\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Alfa_beta_gamma_neutron_radiation-174x300.png\" \/><\/a><figcaption id=\"caption-attachment-317\" class=\"wp-caption-text\"><span>Intera\u00e7\u00e3o da radia\u00e7\u00e3o com a mat\u00e9ria<\/span><\/figcaption><\/figure>\n<p><strong><span>A radia\u00e7\u00e3o ionizante<\/span><\/strong><span>\u00a0\u00e9 classificada pela natureza das part\u00edculas ou ondas eletromagn\u00e9ticas que criam o efeito ionizante.\u00a0Essas\u00a0<\/span><strong><span>part\u00edculas \/ ondas<\/span><\/strong><span>\u00a0t\u00eam diferentes mecanismos de ioniza\u00e7\u00e3o e podem ser agrupadas como:<\/span><\/p>\n<ul>\n<li><strong><span>Ionizante direto<\/span><\/strong><span>\u00a0.\u00a0Part\u00edculas carregadas (\u00a0<\/span><strong><span>n\u00facleos at\u00f4micos, el\u00e9trons, p\u00f3sitrons, pr\u00f3tons, m\u00faons etc.<\/span><\/strong><span>\u00a0) podem ionizar \u00e1tomos diretamente por intera\u00e7\u00e3o fundamental atrav\u00e9s da for\u00e7a de Coulomb, se transportarem energia cin\u00e9tica suficiente.\u00a0Essas part\u00edculas devem estar se movendo em velocidades relativ\u00edsticas para alcan\u00e7ar a energia cin\u00e9tica necess\u00e1ria.\u00a0Mesmo os f\u00f3tons (raios gama e raios X) podem ionizar \u00e1tomos diretamente (apesar de serem eletricamente neutros) atrav\u00e9s do efeito Fotoel\u00e9trico e do efeito Compton, mas a ioniza\u00e7\u00e3o secund\u00e1ria (indireta) \u00e9 muito mais significativa.<\/span>\n<ul>\n<li><strong><span>Radia\u00e7\u00e3o alfa<\/span><\/strong><span>\u00a0.\u00a0A radia\u00e7\u00e3o alfa consiste em\u00a0<\/span><a title=\"Alpha Particle\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\"><span>part\u00edculas alfa<\/span><\/a><span>\u00a0em alta energia \/ velocidade.\u00a0A produ\u00e7\u00e3o de part\u00edculas alfa \u00e9 denominada decaimento alfa.\u00a0As part\u00edculas alfa consistem em dois pr\u00f3tons e dois n\u00eautrons unidos em uma part\u00edcula id\u00eantica a um n\u00facleo de h\u00e9lio.\u00a0As part\u00edculas alfa s\u00e3o relativamente grandes e carregam uma carga positiva dupla.\u00a0Eles n\u00e3o s\u00e3o muito penetrantes e um peda\u00e7o de papel pode det\u00ea-los.\u00a0Eles viajam apenas alguns cent\u00edmetros, mas depositam todas as suas energias ao longo de seus caminhos curtos.<\/span><\/li>\n<li><strong><span>Radia\u00e7\u00e3o beta<\/span><\/strong><span>\u00a0.\u00a0A radia\u00e7\u00e3o beta consiste em el\u00e9trons livres ou p\u00f3sitrons a velocidades relativ\u00edsticas.\u00a0<\/span><a title=\"Part\u00edcula Beta\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\"><span>As part\u00edculas beta<\/span><\/a><span>\u00a0(el\u00e9trons) s\u00e3o muito menores que as part\u00edculas alfa.\u00a0Eles carregam uma \u00fanica carga negativa.\u00a0Eles s\u00e3o mais penetrantes que as part\u00edculas alfa, mas o metal fino de alum\u00ednio pode det\u00ea-las.\u00a0Eles podem percorrer v\u00e1rios metros, mas depositam menos energia em qualquer ponto do caminho do que as part\u00edculas alfa.<\/span><\/li>\n<\/ul>\n<\/li>\n<li><strong><span>Ionizando indiretamente<\/span><\/strong><span>\u00a0.\u00a0A radia\u00e7\u00e3o ionizante indireta \u00e9 part\u00edculas eletricamente neutras e, portanto, n\u00e3o interage fortemente com a mat\u00e9ria.\u00a0A maior parte dos efeitos de ioniza\u00e7\u00e3o \u00e9 devida a ioniza\u00e7\u00f5es secund\u00e1rias.<\/span>\n<ul>\n<li><strong><span>Radia\u00e7\u00e3o de f\u00f3tons<\/span><\/strong><span>\u00a0(\u00a0<\/span><a title=\"Raios gama \/ radia\u00e7\u00e3o gama\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\"><span>raios gama<\/span><\/a><span>\u00a0ou\u00a0<a title=\"Raios gama \/ radia\u00e7\u00e3o gama\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">raios<\/a>\u00a0X).\u00a0A radia\u00e7\u00e3o de f\u00f3tons consiste em\u00a0<\/span><a title=\"F\u00f3ton - Part\u00edcula Fundamental\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/\"><span>f\u00f3tons<\/span><\/a><span>\u00a0de alta energia\u00a0.\u00a0Esses f\u00f3tons s\u00e3o part\u00edculas \/ ondas (Dualidade de Part\u00edculas de Onda) sem massa de repouso ou carga el\u00e9trica.\u00a0Eles podem viajar 10 metros ou mais no ar.\u00a0Esta \u00e9 uma longa dist\u00e2ncia em compara\u00e7\u00e3o com part\u00edculas alfa ou beta.\u00a0No entanto, os raios gama depositam menos energia em seus caminhos.\u00a0Chumbo, \u00e1gua e concreto impedem a radia\u00e7\u00e3o gama.\u00a0Os f\u00f3tons (raios gama e raios X) podem ionizar \u00e1tomos diretamente atrav\u00e9s do efeito Fotoel\u00e9trico e do efeito Compton, onde o el\u00e9tron relativamente energ\u00e9tico \u00e9 produzido.\u00a0O el\u00e9tron secund\u00e1rio continuar\u00e1 produzindo\u00a0<\/span><strong><span>m\u00faltiplos<\/span><\/strong><span>\u00a0eventos de\u00a0<strong>ioniza\u00e7\u00e3o<\/strong>\u00a0; portanto, a\u00a0<strong>ioniza\u00e7\u00e3o<\/strong>\u00a0secund\u00e1ria (indireta) \u00e9 muito mais significativa.<\/span><\/li>\n<li><strong><span>Radia\u00e7\u00e3o de n\u00eautrons<\/span><\/strong><span>\u00a0.\u00a0A radia\u00e7\u00e3o de\u00a0<\/span><a title=\"N\u00eautron gr\u00e1tis\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/free-neutron\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span>n\u00eautrons<\/span><\/a><span>\u00a0consiste em\u00a0<a title=\"N\u00eautron gr\u00e1tis\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/free-neutron\/\" target=\"_blank\" rel=\"noopener noreferrer\">n\u00eautrons livres<\/a>\u00a0em qualquer energia \/ velocidade.\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>Os n\u00eautrons<\/span><\/a><span>\u00a0podem ser emitidos por\u00a0<\/span><a title=\"Fic\u00e3o nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span>fiss\u00e3o nuclear<\/span><\/a><span>\u00a0ou pela\u00a0<\/span><a title=\"Decaimento radioativo - Decaimento nuclear\" href=\"https:\/\/www.nuclear-power.com\/radioactive-decay\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span>decomposi\u00e7\u00e3o<\/span><\/a><span>\u00a0de alguns \u00e1tomos radioativos.\u00a0Os n\u00eautrons t\u00eam carga el\u00e9trica zero e n\u00e3o podem causar ioniza\u00e7\u00e3o diretamente.\u00a0Os n\u00eautrons ionizam a mat\u00e9ria\u00a0<\/span><strong><span>apenas indiretamente<\/span><\/strong><span>\u00a0.\u00a0Por exemplo, quando os n\u00eautrons atingem os n\u00facleos de hidrog\u00eanio, ocorre radia\u00e7\u00e3o de pr\u00f3tons (pr\u00f3tons r\u00e1pidos).\u00a0Os n\u00eautrons podem variar de part\u00edculas de alta velocidade e alta energia a part\u00edculas de baixa velocidade e baixa energia (chamados n\u00eautrons t\u00e9rmicos).\u00a0Os n\u00eautrons podem viajar centenas de p\u00e9s no ar sem nenhuma intera\u00e7\u00e3o.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/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<div class=\"su-spacer\"><\/div>\n<h2><span>Radia\u00e7\u00e3o alfa<\/span><\/h2>\n<p><strong><span>A radia\u00e7\u00e3o alfa<\/span><\/strong><span>\u00a0\u00a0consiste em\u00a0<\/span><strong><a title=\"Alpha Particle\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\"><span>part\u00edculas alfa<\/span><\/a><span>\u00a0,<\/span><\/strong><span>\u00a0que s\u00e3o\u00a0<\/span><strong><span>n\u00facleos<\/span><\/strong><span>\u00a0energ\u00e9ticos\u00a0<strong>de h\u00e9lio<\/strong>\u00a0.\u00a0A produ\u00e7\u00e3o de part\u00edculas alfa \u00e9 denominada decaimento alfa.\u00a0As part\u00edculas alfa consistem 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\/\"><span>n\u00eautrons<\/span><\/a><span>\u00a0unidos em uma part\u00edcula id\u00eantica a um n\u00facleo de h\u00e9lio.\u00a0As part\u00edculas alfa s\u00e3o relativamente grandes e carregam uma carga positiva dupla.<\/span><\/p>\n<p><span>As principais caracter\u00edsticas das part\u00edculas alfa est\u00e3o resumidas em alguns pontos a seguir:<\/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 t\u00edpicas t\u00eam energia cin\u00e9tica em torno de 5 MeV.\u00a0Isto \u00e9 devido \u00e0 natureza do decaimento alfa.<\/span><\/li>\n<li><span>O decaimento alfa puro \u00e9 muito raro, o decaimento alfa \u00e9 frequentemente acompanhado por\u00a0<\/span><a title=\"Raios gama \/ radia\u00e7\u00e3o gama\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\"><span>radia\u00e7\u00e3o gama<\/span><\/a><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.\u00a0Portanto, part\u00edculas alfa t\u00eam\u00a0<\/span><strong><span>faixas muito curtas<\/span><\/strong><span>\u00a0.\u00a0Por outro lado, eles depositam todas as suas energias ao longo de seus caminhos curtos.<\/span><\/li>\n<li><span>Por exemplo, os intervalos de uma part\u00edcula alfa de 5 MeV (a maioria possui essa energia inicial) s\u00e3o aproximadamente apenas 0,002 cm em liga de alum\u00ednio ou aproximadamente 3,5 cm no ar.<\/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<li><a title=\"Curva de Bragg e pico de Bragg\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-heavy-charged-particles\/bragg-curve-bragg-peak\/\"><strong><span>A curva de Bragg<\/span><\/strong><\/a><span>\u00a0\u00e9 t\u00edpica para part\u00edculas alfa e para outras part\u00edculas carregadas pesadas e descreve a perda de energia da radia\u00e7\u00e3o ionizante durante a viagem pela mat\u00e9ria.<\/span><\/li>\n<\/ul>\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-spacer\"><\/div>\n<div class=\"su-spacer\"><\/div>\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=\"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\"><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 aproximadamente apenas 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.\u00a0Mesmo 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><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-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<\/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\">\n<h2><span>Blindagem da radia\u00e7\u00e3o alfa<\/span><\/h2>\n<p><span>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<\/div>\n<\/div>\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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A radia\u00e7\u00e3o alfa consiste em part\u00edculas alfa, que s\u00e3o n\u00facleos energ\u00e9ticos de h\u00e9lio. A produ\u00e7\u00e3o de radia\u00e7\u00e3o alfa \u00e9 denominada decaimento alfa. A prote\u00e7\u00e3o da radia\u00e7\u00e3o alfa n\u00e3o representa um problema dif\u00edcil. Dosimetria de Radia\u00e7\u00e3o Formas de radia\u00e7\u00e3o ionizante Intera\u00e7\u00e3o da radia\u00e7\u00e3o com a mat\u00e9ria A radia\u00e7\u00e3o ionizante\u00a0\u00e9 classificada pela natureza das part\u00edculas ou ondas &#8230; <a title=\"O que \u00e9 radia\u00e7\u00e3o alfa &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-radiacao-alfa-definicao\/\" aria-label=\"More on O que \u00e9 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 radia\u00e7\u00e3o alfa - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A radia\u00e7\u00e3o alfa consiste em part\u00edculas alfa, que s\u00e3o n\u00facleos energ\u00e9ticos de h\u00e9lio. 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