{"id":21521,"date":"2020-07-20T10:27:00","date_gmt":"2020-07-20T10:27:00","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-dosimetria-gama-dosimetro-gama-definicao\/"},"modified":"2020-07-20T10:27:00","modified_gmt":"2020-07-20T10:27:00","slug":"o-que-e-dosimetria-gama-dosimetro-gama-definicao","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-dosimetria-gama-dosimetro-gama-definicao\/","title":{"rendered":"O que \u00e9 Dosimetria Gama &#8211; Dos\u00edmetro Gama &#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 dosimetria gama \u00e9 a medi\u00e7\u00e3o, c\u00e1lculo e avalia\u00e7\u00e3o das doses absorvidas e a atribui\u00e7\u00e3o dessas doses aos indiv\u00edduos.\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>A dosimetria gama<\/strong>\u00a0\u00a0\u00e9 a medi\u00e7\u00e3o, c\u00e1lculo e avalia\u00e7\u00e3o das doses absorvidas e a atribui\u00e7\u00e3o dessas doses aos indiv\u00edduos.\u00a0\u00c9 a ci\u00eancia e a pr\u00e1tica que tentam relacionar quantitativamente medidas espec\u00edficas feitas em um campo de radia\u00e7\u00e3o com mudan\u00e7as qu\u00edmicas e \/ ou biol\u00f3gicas que a radia\u00e7\u00e3o produziria em um alvo.<\/p>\n<p>Como existem dois tipos de exposi\u00e7\u00e3o \u00e0 radia\u00e7\u00e3o, exposi\u00e7\u00e3o externa e interna, a dosimetria tamb\u00e9m pode ser categorizada como:<\/p>\n<ul>\n<li><strong>Dosimetria externa<\/strong>\u00a0.\u00a0A exposi\u00e7\u00e3o externa \u00e9 a radia\u00e7\u00e3o que vem de fora do nosso corpo e interage conosco.\u00a0Nesse caso, analisamos predominantemente a exposi\u00e7\u00e3o\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">a raios gama<\/a>\u00a0\u00a0e\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\">part\u00edculas beta<\/a>\u00a0, j\u00e1 que as\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\">part\u00edculas alfa<\/a>\u00a0, em geral, n\u00e3o representam risco de exposi\u00e7\u00e3o externa, porque as part\u00edculas geralmente n\u00e3o passam pela pele.\u00a0Como os f\u00f3tons e beta interagem atrav\u00e9s de for\u00e7as eletromagn\u00e9ticas e n\u00eautrons interagem atrav\u00e9s de for\u00e7as nucleares, seus m\u00e9todos de detec\u00e7\u00e3o e dosimetria s\u00e3o substancialmente diferentes.\u00a0A fonte de radia\u00e7\u00e3o pode ser, por exemplo, um equipamento que produz a radia\u00e7\u00e3o como um recipiente com materiais radioativos ou como uma m\u00e1quina de raio-x.\u00a0A dosimetria externa \u00e9 baseada em medi\u00e7\u00f5es com um\u00a0\u00a0<strong>dos\u00edmetro<\/strong>, ou inferido a partir de medi\u00e7\u00f5es feitas por outros instrumentos de prote\u00e7\u00e3o radiol\u00f3gica.<\/li>\n<li><strong>Dosimetria interna<\/strong>\u00a0.\u00a0Se a fonte de radia\u00e7\u00e3o est\u00e1\u00a0\u00a0<strong>dentro do nosso corpo<\/strong>\u00a0, dizemos, \u00e9\u00a0\u00a0<strong>a exposi\u00e7\u00e3o interna<\/strong>\u00a0.\u00a0A ingest\u00e3o de material radioativo pode ocorrer por v\u00e1rias vias, como a ingest\u00e3o de contamina\u00e7\u00e3o radioativa em alimentos ou l\u00edquidos.\u00a0A prote\u00e7\u00e3o contra a exposi\u00e7\u00e3o interna \u00e9 mais complicada.\u00a0A maioria dos radionucl\u00eddeos fornecer\u00e1 muito mais doses de radia\u00e7\u00e3o se, de alguma forma, puderem entrar em seu corpo, do que se ficassem fora.\u00a0A avalia\u00e7\u00e3o da dosimetria interna depende de uma variedade de t\u00e9cnicas de monitoramento, bioensaio ou gera\u00e7\u00e3o de imagens de radia\u00e7\u00e3o.<\/li>\n<\/ul>\n<p>Estudos demonstraram que a radia\u00e7\u00e3o alfa e n\u00eautron causa maior dano biol\u00f3gico para uma dada deposi\u00e7\u00e3o de energia por kg de tecido do que a radia\u00e7\u00e3o gama.\u00a0Foi descoberto que os efeitos biol\u00f3gicos de qualquer radia\u00e7\u00e3o\u00a0\u00a0<strong>aumentam<\/strong>\u00a0\u00a0com a\u00a0\u00a0<strong>transfer\u00eancia linear de energia<\/strong>\u00a0\u00a0(LET).\u00a0Em suma, o dano biol\u00f3gico da\u00a0<strong>radia\u00e7\u00e3o<\/strong>\u00a0de\u00a0\u00a0<strong>alta LET<\/strong>\u00a0\u00a0(\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\">part\u00edculas alfa<\/a>\u00a0,\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/what-is-proton-properties-of-proton\/\">pr\u00f3tons<\/a>\u00a0\u00a0ou\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\">n\u00eautrons<\/a>\u00a0) \u00e9 muito maior do que o da\u00a0<strong>radia\u00e7\u00e3o<\/strong>\u00a0de\u00a0\u00a0<strong>baixa LET<\/strong>\u00a0\u00a0(\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">raios gama<\/a>)\u00a0Isso ocorre porque o tecido vivo pode reparar mais facilmente os danos causados \u200b\u200bpela radia\u00e7\u00e3o que se espalha por uma \u00e1rea grande do que aquela que est\u00e1 concentrada em uma \u00e1rea pequena.\u00a0Como mais danos biol\u00f3gicos s\u00e3o causados \u200b\u200bpela mesma dose f\u00edsica (ou seja, a mesma energia depositada por unidade de massa de tecido), um cinza da radia\u00e7\u00e3o alfa ou n\u00eautron \u00e9 mais prejudicial do que um cinza da radia\u00e7\u00e3o gama.\u00a0Este fato de que radia\u00e7\u00f5es de diferentes tipos (e energias) produzem efeitos biol\u00f3gicos diferentes para a mesma dose absorvida \u00e9 descrito em termos de fatores conhecidos como\u00a0\u00a0<strong>efetividade biol\u00f3gica relativa<\/strong>\u00a0\u00a0(RBE) e\u00a0\u00a0<strong>fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o<\/strong>\u00a0\u00a0(w\u00a0<sub>R<\/sub>\u00a0).<\/p>\n<h2><span id=\"Radiation_Weighting_Factors_8211_ICRP\">Fatores de pondera\u00e7\u00e3o por radia\u00e7\u00e3o &#8211; ICRP<\/span><\/h2>\n<p>Para radia\u00e7\u00e3o de f\u00f3ton e el\u00e9tron, o\u00a0\u00a0<strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/equivalent-dose\/radiation-weighting-factor\/\">fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o<\/a><\/strong>\u00a0tem o valor 1 independentemente da energia da radia\u00e7\u00e3o e para a radia\u00e7\u00e3o alfa o valor 20. Para a radia\u00e7\u00e3o de n\u00eautrons, o valor depende da energia e atinge de 5 a 20.<\/p>\n<figure id=\"attachment_25306\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-25306\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-ICRP.png\"><img loading=\"lazy\" class=\"size-full wp-image-25306 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-ICRP.png\" alt=\"Fatores de pondera\u00e7\u00e3o de radia\u00e7\u00e3o\" width=\"555\" height=\"245\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-ICRP.png\" \/><\/a><figcaption id=\"caption-attachment-25306\" class=\"wp-caption-text\">Fonte: ICRP, 2003. Efetividade biol\u00f3gica relativa (RBE), fator de qualidade (Q) e fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o (wR).\u00a0Publica\u00e7\u00e3o ICRP 92. Ann.\u00a0ICRP 33 (4).<\/figcaption><\/figure>\n<p>Em 2007, o ICRP publicou um\u00a0\u00a0<strong>novo conjunto de fatores de pondera\u00e7\u00e3o de radia\u00e7\u00e3o<\/strong>\u00a0(ICRP Publ. 103: As Recomenda\u00e7\u00f5es de 2007 da Comiss\u00e3o Internacional de Prote\u00e7\u00e3o Radiol\u00f3gica).\u00a0Esses fatores s\u00e3o apresentados abaixo.<\/p>\n<figure id=\"attachment_25310\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-25310\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP.png\"><img loading=\"lazy\" class=\"size-full wp-image-25310 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP.png\" alt=\"Fatores de pondera\u00e7\u00e3o por radia\u00e7\u00e3o - corrente - ICRP\" width=\"560\" height=\"296\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Radiation-weighting-factors-current-ICRP.png\" \/><\/a><figcaption id=\"caption-attachment-25310\" class=\"wp-caption-text\">Fonte: ICRP Publ.\u00a0103: As recomenda\u00e7\u00f5es de 2007 da Comiss\u00e3o Internacional de Prote\u00e7\u00e3o Radiol\u00f3gica<\/figcaption><\/figure>\n<p>Como mostrado na tabela, aw\u00a0<sub>R<\/sub>\u00a0\u00a0de 1 \u00e9 para todas as radia\u00e7\u00f5es de baixa LET, ou seja, raios X e raios gama de todas as energias, bem como el\u00e9trons e m\u00faons.\u00a0Uma curva suave, considerada uma aproxima\u00e7\u00e3o, foi ajustada aos w\u00a0<sub>R<\/sub>\u00a0valores como uma fun\u00e7\u00e3o da energia incidente de neutr\u00f5es.\u00a0Observe que E\u00a0<sub>n<\/sub>\u00a0\u00a0\u00e9 a energia de n\u00eautrons em MeV.<\/p>\n<figure id=\"attachment_25384\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-25384\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radiation-weighting-factor-neutrons-ICRP.png\"><img loading=\"lazy\" class=\"size-full wp-image-25384 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radiation-weighting-factor-neutrons-ICRP.png\" alt=\"fator de pondera\u00e7\u00e3o por radia\u00e7\u00e3o - n\u00eautrons - ICRP\" width=\"527\" height=\"339\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/radiation-weighting-factor-neutrons-ICRP.png\" \/><\/a><figcaption id=\"caption-attachment-25384\" class=\"wp-caption-text\">O fator de pondera\u00e7\u00e3o de radia\u00e7\u00e3o wR para n\u00eautrons introduzido na Publica\u00e7\u00e3o 60 (ICRP, 1991) como uma fun\u00e7\u00e3o descont\u00ednua da energia de n\u00eautrons (- &#8211; -) e a modifica\u00e7\u00e3o proposta (-).<\/figcaption><\/figure>\n<p><span>Assim, por exemplo, uma dose absorvida de 1 Gy por part\u00edculas alfa levar\u00e1 a uma dose equivalente a 20 Sv, e estima-se que uma dose equivalente de radia\u00e7\u00e3o tenha o mesmo efeito biol\u00f3gico que uma quantidade igual de dose absorvida de raios gama, que \u00e9 dado um fator de pondera\u00e7\u00e3o de 1.<\/span><\/p>\n<h2><span>Detectores de radia\u00e7\u00e3o gama<\/span><\/h2>\n<p><strong><span>Os detectores<\/span><\/strong><span>\u00a0tamb\u00e9m podem ser classificados de acordo com materiais e m\u00e9todos sens\u00edveis que podem ser utilizados para fazer uma medi\u00e7\u00e3o:<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/\"><strong><span>Detectores de ioniza\u00e7\u00e3o gasosa<\/span><\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/scintillation-counter-scintillation-detector\/\"><strong><span>Detectores de cintila\u00e7\u00e3o<\/span><\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/semiconductor-detectors\/\"><strong><span>Detectores de semicondutores<\/span><\/strong><\/a><\/li>\n<\/ul>\n<h3><span id=\"Detection_of_Beta_Radiation_using_Ionization_Chamber\"><span>Detec\u00e7\u00e3o de radia\u00e7\u00e3o gama usando c\u00e2mara de ioniza\u00e7\u00e3o<\/span><\/span><\/h3>\n<p><img loading=\"lazy\" class=\"alignright size-medium wp-image-26132 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/ionization-chamber-basic-principle-202x300.png\" alt=\"c\u00e2mara de ioniza\u00e7\u00e3o - princ\u00edpio b\u00e1sico\" width=\"202\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/ionization-chamber-basic-principle-202x300.png\" \/><\/p>\n<p><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\"><span>Os raios gama<\/span><\/a><span>\u00a0\u00a0t\u00eam muito pouco problema em penetrar nas paredes met\u00e1licas da c\u00e2mara.\u00a0Portanto, c\u00e2maras de ioniza\u00e7\u00e3o podem ser usadas para detectar radia\u00e7\u00e3o gama e raios-X conhecidos coletivamente como f\u00f3tons, e para isso o tubo sem janelas \u00e9 usado.\u00a0As c\u00e2maras de ioniza\u00e7\u00e3o t\u00eam uma boa resposta uniforme \u00e0 radia\u00e7\u00e3o em uma ampla gama de energias e s\u00e3o os meios preferidos para medir altos n\u00edveis de radia\u00e7\u00e3o gama.\u00a0Alguns problemas s\u00e3o causados \u200b\u200bpelo fato de que as part\u00edculas alfa s\u00e3o mais ionizantes que as part\u00edculas beta e os raios gama; portanto, mais corrente \u00e9 produzida na regi\u00e3o da c\u00e2mara de ioniza\u00e7\u00e3o por alfa do que beta e gama.\u00a0Os raios gama depositam uma quantidade significativamente menor de energia no detector do que outras part\u00edculas.<\/span><\/p>\n<p><span>A efici\u00eancia da c\u00e2mara pode ser aumentada ainda mais pelo uso de um g\u00e1s de alta press\u00e3o.\u00a0Tipicamente, uma press\u00e3o de 8 a 10 atmosferas pode ser usada e v\u00e1rios gases nobres s\u00e3o empregados.\u00a0Por exemplo, as\u00a0\u00a0<\/span><strong><span>c\u00e2maras de ioniza\u00e7\u00e3o de xen\u00f4nio de alta press\u00e3o (HPXe)<\/span><\/strong><span>\u00a0\u00a0s\u00e3o ideais para uso em ambientes n\u00e3o controlados, pois a resposta de um detector demonstrou ser uniforme em grandes faixas de temperatura (20\u2013170 \u00b0 C).\u00a0A press\u00e3o mais alta resulta em uma maior densidade de g\u00e1s e, portanto, em uma maior chance de colis\u00e3o com o g\u00e1s de preenchimento e a cria\u00e7\u00e3o de pares de \u00edons por radia\u00e7\u00e3o gama incidente.\u00a0Devido ao aumento da espessura da parede necess\u00e1ria para suportar essa alta press\u00e3o, apenas a radia\u00e7\u00e3o gama pode ser detectada.\u00a0Esses detectores s\u00e3o usados \u200b\u200bem\u00a0\u00a0<\/span><strong><span>medidores de medi\u00e7\u00e3o<\/span><\/strong><span>\u00a0\u00a0e para monitoramento ambiental.<\/span><\/p>\n<h3><span id=\"Detection_of_Beta_Radiation_using_Ionization_Chamber\"><span>Detec\u00e7\u00e3o de radia\u00e7\u00e3o gama usando o contador Geiger<\/span><\/span><\/h3>\n<figure id=\"attachment_26088\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-26088\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Ionization-Detector-Geiger-Tube.png\"><img loading=\"lazy\" class=\"size-medium wp-image-26088 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Ionization-Detector-Geiger-Tube-300x178.png\" alt=\"Detector de radia\u00e7\u00e3o ionizante - Tubo Geiger\" width=\"300\" height=\"178\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Ionization-Detector-Geiger-Tube-300x178.png\" \/><\/a><figcaption id=\"caption-attachment-26088\" class=\"wp-caption-text\"><span>Detector de radia\u00e7\u00e3o ionizante &#8211; Tubo Geiger<\/span><\/figcaption><\/figure>\n<p><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/geiger-counter-geiger-mueller-detector\/\"><strong><span>O contador Geiger<\/span><\/strong><\/a><span>\u00a0\u00a0pode detectar radia\u00e7\u00e3o ionizante, como\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\">\u00a0part\u00edculas\u00a0<\/a><\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/alpha-particle\/\"><span>alfa<\/span><\/a><span>\u00a0\u00a0e\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\"><span>\u00a0beta<\/span><\/a><span>\u00a0,\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\"><span>\u00a0n\u00eautrons<\/span><\/a><span>\u00a0e\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\"><span>\u00a0raios gama,<\/span><\/a><span>\u00a0\u00a0usando o efeito de ioniza\u00e7\u00e3o produzido em um tubo Geiger-M\u00fcller, que d\u00e1 nome ao instrumento.\u00a0A tens\u00e3o do detector \u00e9 ajustada para que as condi\u00e7\u00f5es correspondam \u00e0 regi\u00e3o de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/operating-regions-of-ionizing-detectors-detector-voltage\/geiger-mueller-region-ionization-detector\/\"><strong><span>\u00a0Geiger-Mueller<\/span><\/strong><\/a><span>\u00a0.<\/span><\/p>\n<p><span>O\u00a0\u00a0<\/span><strong><span>alto fator<\/span><\/strong><span>\u00a0de\u00a0<strong>amplifica\u00e7\u00e3o\u00a0<\/strong>\u00a0do contador Geiger \u00e9 a principal vantagem sobre a c\u00e2mara de ioniza\u00e7\u00e3o.\u00a0O contador Geiger \u00e9, portanto, um dispositivo muito mais sens\u00edvel do que outras c\u00e2maras.\u00a0\u00c9 frequentemente usado na detec\u00e7\u00e3o de raios gama de baixo n\u00edvel e part\u00edculas beta por esse motivo.<\/span><\/p>\n<h3><span>Detec\u00e7\u00e3o de radia\u00e7\u00e3o gama usando contador de cintila\u00e7\u00e3o<\/span><\/h3>\n<figure id=\"attachment_26292\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-26292\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Scintillation_Counter-Photomultiplier-Tube.jpg\"><img loading=\"lazy\" class=\"size-medium wp-image-26292 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Scintillation_Counter-Photomultiplier-Tube-300x187.jpg\" alt=\"Scintillation_Counter - Tubo Fotomultiplicador\" width=\"300\" height=\"187\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Scintillation_Counter-Photomultiplier-Tube-300x187.jpg\" \/><\/a><figcaption id=\"caption-attachment-26292\" class=\"wp-caption-text\"><span>Aparelho com cristal cintilante, fotomultiplicador e componentes de aquisi\u00e7\u00e3o de dados.\u00a0Fonte: wikipedia.org Licen\u00e7a CC BY-SA 3.0<\/span><\/figcaption><\/figure>\n<p><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/scintillation-counter-scintillation-detector\/\"><strong><span>Os contadores de cintila\u00e7\u00e3o<\/span><\/strong><\/a><span>\u00a0\u00a0s\u00e3o usados \u200b\u200bpara medir a radia\u00e7\u00e3o em uma variedade de aplica\u00e7\u00f5es, incluindo medidores port\u00e1teis de pesquisa de radia\u00e7\u00e3o, monitoramento pessoal e ambiental de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/protection-from-exposures\/radioactive-contamination\/\"><span>\u00a0contamina\u00e7\u00e3o radioativa<\/span><\/a><span>\u00a0, imagens m\u00e9dicas, ensaios radiom\u00e9tricos, seguran\u00e7a nuclear e seguran\u00e7a de usinas nucleares.\u00a0Eles s\u00e3o amplamente utilizados porque podem ser fabricados de maneira barata e com boa efici\u00eancia e podem medir a intensidade e a energia da radia\u00e7\u00e3o incidente.<\/span><\/p>\n<p><span>Os contadores de cintila\u00e7\u00e3o podem ser usados \u200b\u200bpara detectar\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\">radia\u00e7\u00e3o\u00a0<\/a><\/span><a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-radiacao-alfa-definicao\/\"><span>alfa<\/span><\/a><span>\u00a0,\u00a0\u00a0<\/span><a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-radiacao-beta-definicao\/\"><span>beta<\/span><\/a><span>\u00a0e\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\"><span>gama<\/span><\/a><span>\u00a0.\u00a0Eles podem ser usados \u200b\u200btamb\u00e9m para a\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/detection-neutrons\/\"><span>detec\u00e7\u00e3o de n\u00eautrons<\/span><\/a><span>\u00a0.\u00a0Para esses fins, diferentes cintiladores s\u00e3o usados.<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/\"><strong><span>Raios gama<\/span><\/strong><\/a><span>\u00a0.\u00a0<\/span><strong><span>Os materiais com alto teor de Z<\/span><\/strong><span>\u00a0\u00a0s\u00e3o mais adequados como cintiladores para a detec\u00e7\u00e3o de raios gama.\u00a0O material de cintila\u00e7\u00e3o mais utilizado \u00e9 o\u00a0<\/span><strong><span>\u00a0NaI (Tl)<\/span><\/strong><span>\u00a0\u00a0(iodeto de s\u00f3dio dopado com t\u00e1lio).\u00a0O iodo fornece a maior parte do poder de parada no iodeto de s\u00f3dio (uma vez que possui um alto Z = 53).\u00a0Esses cintiladores cristalinos s\u00e3o caracterizados por tempos de alta densidade, alto n\u00famero at\u00f4mico e decaimento de pulso de aproximadamente 1 microssegundo (~ 10<\/span><sup><span>\u00a0-6\u00a0<\/span><\/sup><span>sec).\u00a0A cintila\u00e7\u00e3o em cristais inorg\u00e2nicos \u00e9 tipicamente mais lenta que nos org\u00e2nicos.\u00a0Eles exibem alta efici\u00eancia na detec\u00e7\u00e3o de raios gama e s\u00e3o capazes de lidar com altas taxas de contagem.\u00a0Os cristais inorg\u00e2nicos podem ser cortados em tamanhos pequenos e dispostos em uma configura\u00e7\u00e3o de matriz para fornecer sensibilidade \u00e0 posi\u00e7\u00e3o.\u00a0Esse recurso \u00e9 amplamente utilizado em imagens m\u00e9dicas para detectar raios-X ou raios gama.\u00a0Cintiladores inorg\u00e2nicos s\u00e3o melhores na detec\u00e7\u00e3o de raios gama e raios-X.\u00a0Isto \u00e9 devido \u00e0 sua alta densidade e n\u00famero at\u00f4mico, o que fornece uma alta densidade de el\u00e9trons.<\/span><\/li>\n<\/ul>\n<h3><span>Detec\u00e7\u00e3o de radia\u00e7\u00e3o gama usando semicondutores &#8211; HPGe Detectors<\/span><\/h3>\n<figure id=\"attachment_26112\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-26112\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/HPGe-Detector-Germanium.png\"><img loading=\"lazy\" class=\"size-medium wp-image-26112 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/HPGe-Detector-Germanium-300x204.png\" alt=\"Detector HPGe - Germ\u00e2nio\" width=\"300\" height=\"204\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/HPGe-Detector-Germanium-300x204.png\" \/><\/a><figcaption id=\"caption-attachment-26112\" class=\"wp-caption-text\"><span>Detector HPGe com criostato LN2 Fonte: canberra.com<\/span><\/figcaption><\/figure>\n<p><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/semiconductor-detectors\/high-purity-germanium-detectors-hpge\/\"><strong><span>Detectores de germ\u00e2nio de alta pureza<\/span><\/strong><\/a><span>\u00a0\u00a0(<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/semiconductor-detectors\/high-purity-germanium-detectors-hpge\/\"><strong>\u00a0detectores<\/strong><\/a><\/span><strong><span>\u00a0HPGe<\/span><\/strong><span>\u00a0) s\u00e3o a melhor solu\u00e7\u00e3o para<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gamma-spectroscopy\/\"><span>\u00a0espectroscopia<\/span><\/a><span>\u00a0precisa de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gamma-spectroscopy\/\">\u00a0raios gama e raios-x<\/a>\u00a0.<\/span><\/p>\n<p><span>Como foi escrito, o estudo e a an\u00e1lise de espectros de raios gama para uso cient\u00edfico e t\u00e9cnico s\u00e3o chamados espectroscopia gama, e os espectr\u00f4metros de raios gama s\u00e3o os instrumentos que observam e coletam esses dados.\u00a0Um espectr\u00f4metro de raios gama (GRS) \u00e9 um dispositivo sofisticado para medir a distribui\u00e7\u00e3o de energia da radia\u00e7\u00e3o gama.\u00a0Para a medi\u00e7\u00e3o de raios gama acima de v\u00e1rias centenas de keV, existem duas categorias de detectores de grande import\u00e2ncia,\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/scintillation-counter-scintillation-detector\/naitl-scintillators\/\"><strong><span>cintiladores inorg\u00e2nicos como NaI (Tl)<\/span><\/strong><\/a><span>\u00a0\u00a0e\u00a0\u00a0<\/span><strong><span>detectores de semicondutores<\/span><\/strong><span>\u00a0.\u00a0Se uma\u00a0\u00a0<\/span><strong><span>resolu\u00e7\u00e3o de energia perfeita<\/span><\/strong><span>\u00a0\u00a0for necess\u00e1ria, precisamos usar\u00a0\u00a0<\/span><strong><span>um detector \u00e0 base de germ\u00e2nio<\/span><\/strong><span>\u00a0, como o\u00a0\u00a0<\/span><strong><span>detector HPGe<\/span><\/strong><span>.\u00a0Os detectores de semicondutores \u00e0 base de germ\u00e2nio s\u00e3o mais comumente usados \u200b\u200bonde \u00e9 necess\u00e1ria uma resolu\u00e7\u00e3o de energia muito boa, especialmente para\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gamma-spectroscopy\/\"><strong><span>espectroscopia gama<\/span><\/strong><\/a><span>\u00a0, bem como\u00a0\u00a0<\/span><strong><span>espectroscopia de raios-x<\/span><\/strong><span>\u00a0.\u00a0Na espectroscopia gama, o germ\u00e2nio \u00e9 preferido devido ao seu n\u00famero at\u00f4mico ser muito maior que o sil\u00edcio e aumentar a probabilidade de intera\u00e7\u00e3o com raios gama.\u00a0Al\u00e9m disso, o germ\u00e2nio possui menor energia m\u00e9dia necess\u00e1ria para criar um par de el\u00e9trons-orif\u00edcios, que \u00e9 3,6 eV para sil\u00edcio e 2,9 eV para germ\u00e2nio.\u00a0Isso tamb\u00e9m fornece ao \u00faltimo uma melhor resolu\u00e7\u00e3o em energia.\u00a0O FWHM (largura total at\u00e9 a metade do m\u00e1ximo) para detectores de germ\u00e2nio \u00e9 uma fun\u00e7\u00e3o da energia.\u00a0Para um f\u00f3ton de 1,3 MeV, o FWHM \u00e9 de 2,1 keV, o que \u00e9 muito baixo.<\/span><\/p>\n<header class=\"entry-header\">\n<h2 class=\"entry-title\"><span>EPD &#8211; Dos\u00edmetro pessoal eletr\u00f4nico<\/span><\/h2>\n<\/header>\n<div class=\"entry-content\">\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<figure id=\"attachment_26775\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-26775\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/EPD-electronic-personal-dosimeter.png\"><img loading=\"lazy\" class=\"size-full wp-image-26775 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/EPD-electronic-personal-dosimeter.png\" alt=\"EPD - Dos\u00edmetros pessoais eletr\u00f4nicos\" width=\"278\" height=\"299\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/EPD-electronic-personal-dosimeter.png\" \/><\/a><figcaption id=\"caption-attachment-26775\" class=\"wp-caption-text\"><span>EPD &#8211; Dos\u00edmetros pessoais eletr\u00f4nicos com chip Si<\/span><\/figcaption><\/figure>\n<p><span>Um\u00a0\u00a0<\/span><a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-epd-dosimetro-pessoal-eletronico-definicao\/\"><strong><span>dos\u00edmetro pessoal eletr\u00f4nico<\/span><\/strong><\/a><span>\u00a0\u00a0\u00e9 um dos\u00edmetro moderno, que pode fornecer uma leitura cont\u00ednua da\u00a0\u00a0<\/span><strong><span>dose cumulativa<\/span><\/strong><span>\u00a0\u00a0e da\u00a0\u00a0<\/span><strong><span>taxa de dose atual<\/span><\/strong><span>\u00a0e pode avisar a pessoa que o usa quando uma\u00a0\u00a0<\/span><strong><span>taxa de dose especificada<\/span><\/strong><span>\u00a0\u00a0ou uma\u00a0\u00a0<\/span><strong><span>dose cumulativa<\/span><\/strong><span>\u00a0\u00a0\u00e9 excedida.\u00a0Os EPDs s\u00e3o especialmente \u00fateis em \u00e1reas de altas doses, onde o tempo de perman\u00eancia do usu\u00e1rio \u00e9 limitado devido a restri\u00e7\u00f5es de dose.<\/span><\/p>\n<h3><span id=\"Characteristics_of_EPDs\"><span>Caracter\u00edsticas dos EPDs<\/span><\/span><\/h3>\n<p><span>O\u00a0\u00a0<\/span><strong><span>dos\u00edmetro pessoal eletr\u00f4nico, EPD,\u00a0<\/span><\/strong><span>\u00a0\u00e9 capaz de exibir uma\u00a0\u00a0<\/span><strong><span>leitura direta<\/span><\/strong><span>\u00a0\u00a0da dose ou taxa de dose detectada em tempo real.\u00a0Dos\u00edmetros eletr\u00f4nicos podem ser usados \u200b\u200bcomo um dos\u00edmetro suplementar e tamb\u00e9m como um dos\u00edmetro prim\u00e1rio.\u00a0Os dos\u00edmetros passivos e os pessoais eletr\u00f4nicos s\u00e3o frequentemente usados \u200b\u200bjuntos para se complementarem.\u00a0Para estimar doses efetivas, os dos\u00edmetros devem ser usados \u200b\u200bem uma posi\u00e7\u00e3o do corpo representativa de sua exposi\u00e7\u00e3o, geralmente entre a cintura e o pesco\u00e7o, na frente do tronco, de frente para a fonte radioativa.\u00a0Os dos\u00edmetros geralmente s\u00e3o usados \u200b\u200bna parte externa da roupa, ao redor do t\u00f3rax ou do tronco para representar a dose para o \u201ccorpo inteiro\u201d.\u00a0Dos\u00edmetros tamb\u00e9m podem ser usados \u200b\u200bnas extremidades ou perto do olho para medir a dose equivalente a esses tecidos.<\/span><\/p>\n<p><span>O dos\u00edmetro pode ser redefinido, geralmente ap\u00f3s uma leitura para fins de registro e, assim, reutilizado v\u00e1rias vezes.\u00a0Os EPDs possuem uma tela montada na parte superior para facilitar a leitura quando eles est\u00e3o presos no bolso do peito.\u00a0O visor digital fornece informa\u00e7\u00f5es sobre\u00a0\u00a0<\/span><strong><span>dose<\/span><\/strong><span>\u00a0\u00a0e\u00a0\u00a0<\/span><strong><span>taxa de dose<\/span><\/strong><span>\u00a0geralmente em mSv e mSv \/ h.\u00a0O EPD possui um\u00a0\u00a0<\/span><strong><span>alarme de taxa de dose<\/span><\/strong><span>\u00a0e um\u00a0\u00a0<\/span><strong><span>alarme de dose<\/span><\/strong><span>\u00a0.\u00a0Esses alarmes s\u00e3o program\u00e1veis.\u00a0Diferentes alarmes podem ser definidos para diferentes atividades.<\/span><\/p>\n<p><span>Por exemplo:<\/span><\/p>\n<ul>\n<li><span>alarme de taxa de dose a 100 \u03bcSv \/ h,<\/span><\/li>\n<li><span>alarme de dose: 100 \u03bcSv.<\/span><\/li>\n<\/ul>\n<p><span>Se um ponto de ajuste de alarme for alcan\u00e7ado, o display relevante piscar\u00e1 junto com uma luz vermelha e ser\u00e1 gerado um ru\u00eddo agudo.\u00a0Voc\u00ea pode apagar o alarme da taxa de dose recuando para um campo de radia\u00e7\u00e3o mais baixo, mas n\u00e3o pode apagar o alarme de dose at\u00e9 chegar a um leitor de EPD.\u00a0Os EPDs tamb\u00e9m podem emitir um sinal sonoro por cada 1 ou 10 \u03bcSv que registram.\u00a0Isso fornece uma indica\u00e7\u00e3o aud\u00edvel dos campos de radia\u00e7\u00e3o.\u00a0Alguns EPDs possuem recursos de comunica\u00e7\u00e3o sem fio.\u00a0Os EPDs s\u00e3o capazes de medir uma ampla faixa de doses de radia\u00e7\u00e3o, desde n\u00edveis de rotina (\u03bcSv) at\u00e9 n\u00edveis de emerg\u00eancia (centenas de mSv ou unidades de Sieverts) com alta precis\u00e3o, e podem exibir a taxa de exposi\u00e7\u00e3o e os valores acumulados de exposi\u00e7\u00e3o.\u00a0Das tecnologias dos dos\u00edmetros, os dos\u00edmetros eletr\u00f4nicos pessoais s\u00e3o geralmente os mais caros, os maiores em tamanho e os mais vers\u00e1teis.<\/span><\/p>\n<\/div>\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","protected":false},"excerpt":{"rendered":"<p>A dosimetria gama \u00e9 a medi\u00e7\u00e3o, c\u00e1lculo e avalia\u00e7\u00e3o das doses absorvidas e a atribui\u00e7\u00e3o dessas doses aos indiv\u00edduos.\u00a0Dosimetria de Radia\u00e7\u00e3o A dosimetria gama\u00a0\u00a0\u00e9 a medi\u00e7\u00e3o, c\u00e1lculo e avalia\u00e7\u00e3o das doses absorvidas e a atribui\u00e7\u00e3o dessas doses aos indiv\u00edduos.\u00a0\u00c9 a ci\u00eancia e a pr\u00e1tica que tentam relacionar quantitativamente medidas espec\u00edficas feitas em um campo de &#8230; <a title=\"O que \u00e9 Dosimetria Gama &#8211; Dos\u00edmetro Gama &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-dosimetria-gama-dosimetro-gama-definicao\/\" aria-label=\"More on O que \u00e9 Dosimetria Gama &#8211; Dos\u00edmetro Gama &#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 Dosimetria Gama - Dos\u00edmetro Gama - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A dosimetria gama \u00e9 a medi\u00e7\u00e3o, c\u00e1lculo e avalia\u00e7\u00e3o das doses absorvidas e a atribui\u00e7\u00e3o dessas doses aos indiv\u00edduos. 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