{"id":18255,"date":"2020-06-27T17:21:36","date_gmt":"2020-06-27T17:21:36","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-espectro-de-raios-x-caracteristico-e-continuo-definicao\/"},"modified":"2020-07-23T10:05:34","modified_gmt":"2020-07-23T10:05:34","slug":"o-que-e-espectro-de-raios-x-caracteristico-e-continuo-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-espectro-de-raios-x-caracteristico-e-continuo-definicao\/","title":{"rendered":"O que \u00e9 Espectro de Raios-X &#8211; Caracter\u00edstico e Cont\u00ednuo &#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\">Espectro de Raios-X &#8211; Espectro de raios-X caracter\u00edstico e espectro de raios-X cont\u00ednuo (bremsstrahlung).\u00a0Para os raios X gerados pelo tubo de raios X, a parte da energia que \u00e9 transformada em radia\u00e7\u00e3o varia de zero at\u00e9 a energia m\u00e1xima do el\u00e9tron quando atinge o \u00e2nodo.\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>Os raios X<\/strong>\u00a0, tamb\u00e9m conhecidos como\u00a0<strong>radia\u00e7\u00e3o X<\/strong>\u00a0, referem-se \u00e0 radia\u00e7\u00e3o eletromagn\u00e9tica (sem massa em repouso, sem carga) de altas energias.\u00a0Os raios X s\u00e3o\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/\">f\u00f3tons de<\/a>\u00a0alta energia,\u00a0com comprimentos de onda curtos e, portanto, frequ\u00eancia muito alta.\u00a0A frequ\u00eancia de radia\u00e7\u00e3o \u00e9 o par\u00e2metro chave de todos os f\u00f3tons, porque determina a energia de um f\u00f3ton.\u00a0Os f\u00f3tons s\u00e3o classificados de acordo com as energias das ondas de r\u00e1dio de baixa energia e radia\u00e7\u00e3o infravermelha, atrav\u00e9s da luz vis\u00edvel, aos raios X de alta energia e raios\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">gama<\/a>\u00a0.<\/p>\n<p>A maioria dos raios X tem um comprimento de onda variando de 0,01 a 10 nan\u00f4metros (3 \u00d7 10\u00a0<sup>16<\/sup>\u00a0Hz a 3 \u00d7 10\u00a0<sup>19<\/sup>\u00a0Hz), correspondendo a energias na faixa de 100 eV a 100 keV.\u00a0Os comprimentos de onda dos raios X s\u00e3o mais curtos que os dos raios UV e geralmente mais longos que os dos raios gama.<\/p>\n<h2>Espectro de Raios-X &#8211; Caracter\u00edstico e Cont\u00ednuo<\/h2>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/X-ray-tube-X-ray-production.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25155 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/X-ray-tube-X-ray-production-300x184.png\" alt=\"Tubo de raios X - produ\u00e7\u00e3o de raios X\" width=\"300\" height=\"184\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/X-ray-tube-X-ray-production-300x184.png\" \/><\/a>Para os raios X gerados pelo tubo de raios X, a parte da energia que \u00e9 transformada em radia\u00e7\u00e3o varia de zero at\u00e9 a energia m\u00e1xima do el\u00e9tron quando atinge o \u00e2nodo.\u00a0A energia m\u00e1xima do f\u00f3ton de raio-X produzido \u00e9 limitada pela energia do el\u00e9tron incidente, que \u00e9 igual \u00e0 tens\u00e3o no tubo vezes a carga do el\u00e9tron, de modo que um tubo de 100 kV n\u00e3o pode criar raios-X com energia superior a 100 keV.\u00a0Quando os el\u00e9trons atingem o alvo, os raios X s\u00e3o criados por dois processos at\u00f4micos diferentes:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/X-Ray-Spectrum-Characteristic-and-Continuous-figure.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25156 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/X-Ray-Spectrum-Characteristic-and-Continuous-figure-300x259.png\" alt=\"Espectro de Raios-X - Caracter\u00edstico e Cont\u00ednuo\" width=\"300\" height=\"259\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/X-Ray-Spectrum-Characteristic-and-Continuous-figure-300x259.png\" \/><\/a>Bremsstrahlung<\/strong>\u00a0.\u00a0<strong>O bremsstrahlung<\/strong>\u00a0\u00e9 radia\u00e7\u00e3o eletromagn\u00e9tica produzida pela acelera\u00e7\u00e3o ou desacelera\u00e7\u00e3o de um el\u00e9tron quando desviada por fortes\u00a0<strong>campos eletromagn\u00e9ticos<\/strong>\u00a0dos n\u00facleos alvo de alto Z (n\u00famero de pr\u00f3tons).\u00a0O nome bremsstrahlung vem do alem\u00e3o.\u00a0A tradu\u00e7\u00e3o literal \u00e9\u00a0<strong>&#8216;radia\u00e7\u00e3o de frenagem&#8217;<\/strong>\u00a0.\u00a0Da teoria cl\u00e1ssica, quando uma part\u00edcula carregada \u00e9 acelerada ou desacelerada, ela deve irradiar energia.\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/bremsstrahlung-2\/\">O bremsstrahlung<\/a>\u00a0\u00e9 uma das poss\u00edveis intera\u00e7\u00f5es de part\u00edculas carregadas de luz com a mat\u00e9ria (especialmente com\u00a0<strong>altos n\u00fameros at\u00f4micos<\/strong>)\u00a0Esses raios-X t\u00eam um espectro cont\u00ednuo.\u00a0A intensidade dos raios X aumenta linearmente com a diminui\u00e7\u00e3o da frequ\u00eancia, de zero na energia dos el\u00e9trons incidentes, a tens\u00e3o no tubo de raios X.\u00a0Alterar o material do qual o alvo no tubo \u00e9 feito n\u00e3o afeta o espectro dessa radia\u00e7\u00e3o cont\u00ednua.\u00a0Se pass\u00e1ssemos de um alvo de molibd\u00eanio para um de cobre, por exemplo, todos os recursos do espectro de raios-X mudariam, exceto o comprimento de onda de corte.<\/li>\n<li><strong>Emiss\u00e3o caracter\u00edstica de raios-X.\u00a0<\/strong>Se o el\u00e9tron tiver energia suficiente, ele pode derrubar um el\u00e9tron orbital da camada interna de um \u00e1tomo de metal.\u00a0Como o processo deixa uma\u00a0<strong>vaga<\/strong>\u00a0no n\u00edvel de energia do el\u00e9tron do qual o el\u00e9tron veio, os el\u00e9trons externos do \u00e1tomo\u00a0<strong>caem em cascata<\/strong>\u00a0para preencher os n\u00edveis at\u00f4micos mais baixos, e\u00a0geralmente s\u00e3o emitidos\u00a0um ou mais\u00a0<strong>raios-X caracter\u00edsticos<\/strong>\u00a0.\u00a0Como resultado, picos de intensidade acentuados aparecem no espectro em comprimentos de onda que s\u00e3o uma caracter\u00edstica do material a partir do qual o alvo do \u00e2nodo \u00e9 feito.\u00a0As frequ\u00eancias dos raios X caracter\u00edsticos podem ser previstas a partir do modelo de Bohr.<\/li>\n<\/ul>\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>Espectro de Raios-X &#8211; Espectro de raios-X caracter\u00edstico e espectro de raios-X cont\u00ednuo (bremsstrahlung).\u00a0Para os raios X gerados pelo tubo de raios X, a parte da energia que \u00e9 transformada em radia\u00e7\u00e3o varia de zero at\u00e9 a energia m\u00e1xima do el\u00e9tron quando atinge o \u00e2nodo.\u00a0Dosimetria de Radia\u00e7\u00e3o Os raios X\u00a0, tamb\u00e9m conhecidos como\u00a0radia\u00e7\u00e3o X\u00a0, referem-se &#8230; <a title=\"O que \u00e9 Espectro de Raios-X &#8211; Caracter\u00edstico e Cont\u00ednuo &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-espectro-de-raios-x-caracteristico-e-continuo-definicao\/\" aria-label=\"More on O que \u00e9 Espectro de Raios-X &#8211; Caracter\u00edstico e Cont\u00ednuo &#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 Espectro de Raios-X - Caracter\u00edstico e Cont\u00ednuo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Espectro de Raios-X - Espectro de raios-X caracter\u00edstico e espectro de raios-X cont\u00ednuo (bremsstrahlung). 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