{"id":17798,"date":"2020-06-21T19:36:55","date_gmt":"2020-06-21T19:36:55","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/"},"modified":"2020-07-22T05:33:35","modified_gmt":"2020-07-22T05:33:35","slug":"o-que-e-o-contador-geiger-vs-contador-proporcional-definicao","status":"publish","type":"post","link":"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/","title":{"rendered":"O que \u00e9 o contador Geiger vs contador proporcional &#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\">Em geral, o contador Geiger e tamb\u00e9m o contador proporcional s\u00e3o tipos de detectores de ioniza\u00e7\u00e3o gasosa. Contadores proporcionais ou Geiger s\u00e3o quase sempre usados \u200b\u200bno modo de pulso. 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<p><span>Em geral, o contador Geiger e tamb\u00e9m o contador proporcional s\u00e3o tipos de\u00a0\u00a0<\/span><strong><span>detectores de ioniza\u00e7\u00e3o gasosa.\u00a0<\/span><\/strong><span>Estes podem ser classificados de acordo com a voltagem aplicada ao detector:<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/ionization-chamber-ion-chamber\/\"><span>c\u00e2maras de ioniza\u00e7\u00e3o<\/span><\/a><span>\u00a0,<\/span><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/proportional-counter-proportional-detector\/\"><span>contadores proporcionais<\/span><\/a><span>\u00a0,<\/span><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/geiger-counter-geiger-mueller-detector\/\"><span>Contadores Geiger-M\u00fcller<\/span><\/a><span>\u00a0.<\/span><\/li>\n<\/ul>\n<p><span>Como em outros detectores, as c\u00e2maras de ioniza\u00e7\u00e3o podem ser operadas no modo atual ou de pulso.\u00a0Por outro lado, contadores proporcionais ou contadores Geiger s\u00e3o quase sempre usados \u200b\u200bno modo de pulso.\u00a0Detectores de radia\u00e7\u00e3o ionizante podem ser usados \u200b\u200btanto para\u00a0medi\u00e7\u00f5es de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/activity-specific-activity\/\"><span>atividade<\/span><\/a><span>\u00a0quanto para\u00a0medi\u00e7\u00f5es de\u00a0<\/span><a href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-dose-absorvida-formula-equacao-definicao\/\"><span>dose<\/span><\/a><span>\u00a0.\u00a0Com o conhecimento sobre a energia necess\u00e1ria para formar um par de \u00edons &#8211; a dose pode ser obtida.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<h2><span>Contador Geiger<\/span><\/h2>\n<p><span>O\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/geiger-counter-geiger-mueller-detector\/\"><strong><span>contador Geiger<\/span><\/strong><\/a><span>\u00a0, tamb\u00e9m conhecido como\u00a0<\/span><strong><span>contador Geiger-Mueller<\/span><\/strong><span>\u00a0, \u00e9 um dispositivo el\u00e9trico que detecta v\u00e1rios\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/forms-ionizing-radiation\/\"><span>tipos de radia\u00e7\u00e3o ionizante<\/span><\/a><span>\u00a0.\u00a0Este dispositivo recebeu o nome dos dois f\u00edsicos que inventaram o contador em 1928. Mueller era aluno de Hans Geiger. \u00a0<\/span><strong><span>O contador Geiger<\/span><\/strong><span>\u00a0\u00e9 amplamente utilizado em aplica\u00e7\u00f5es como dosimetria de radia\u00e7\u00e3o,\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/\"><span>prote\u00e7\u00e3o radiol\u00f3gica<\/span><\/a><span>\u00a0, f\u00edsica experimental e ind\u00fastria nuclear.\u00a0Um contador Geiger consiste em um\u00a0<\/span><strong><span>tubo Geiger-M\u00fcller<\/span><\/strong><span>\u00a0(o elemento sensor que detecta a radia\u00e7\u00e3o) e a eletr\u00f4nica de processamento, que exibe o resultado.<\/span><\/p>\n<p><strong><span>O contador Geiger<\/span><\/strong><span>\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\/\">part\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\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\"><span>beta<\/span><\/a><span>\u00a0,\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\"><span>n\u00eautrons<\/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>raios 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>Geiger-Mueller<\/span><\/strong><\/a><span>\u00a0.<\/span><\/p>\n<h3><span>Vantagens do contador Geiger-Mueller<\/span><\/h3>\n<ul>\n<li><strong><span>Amplifica\u00e7\u00e3o alta<\/span><\/strong><span>\u00a0.\u00a0Um sinal forte (o\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/proportional-counter-proportional-detector\/gas-amplification-factor-gas-amplification-curve\/\"><strong><span>fator de amplifica\u00e7\u00e3o<\/span><\/strong><\/a><span>\u00a0pode atingir cerca de\u00a0<\/span><strong><span>10\u00a0<\/span><sup><span>10<\/span><\/sup><\/strong><span>\u00a0) \u00e9 produzido por essas avalanches com forma e altura, independentemente da ioniza\u00e7\u00e3o prim\u00e1ria e da energia do f\u00f3ton detectado.\u00a0O pulso de tens\u00e3o neste caso seria um grande e facilmente detect\u00e1vel \u00b1 1.6 V. A vantagem t\u00e9cnica de um contador Geiger \u00e9 sua\u00a0<\/span><strong><span>simplicidade de constru\u00e7\u00e3o<\/span><\/strong><span>\u00a0e sua insensibilidade a pequenas flutua\u00e7\u00f5es de tens\u00e3o.\u00a0Como o processo de amplifica\u00e7\u00e3o de carga melhora muito a rela\u00e7\u00e3o sinal \/ ru\u00eddo do detector, a amplifica\u00e7\u00e3o eletr\u00f4nica subsequente geralmente n\u00e3o \u00e9 necess\u00e1ria.<\/span><\/li>\n<li><strong><span>Simplicidade<\/span><\/strong><span>\u00a0.\u00a0Os contadores GM s\u00e3o usados \u200b\u200bprincipalmente para\u00a0<\/span><strong><span>instrumenta\u00e7\u00e3o port\u00e1til<\/span><\/strong><span>\u00a0devido \u00e0 sua sensibilidade, circuito de contagem simples e capacidade de detectar radia\u00e7\u00e3o de baixo n\u00edvel.\u00a0Os detectores GM s\u00e3o geralmente mais sens\u00edveis a radia\u00e7\u00f5es de baixa energia e baixa intensidade do que os detectores proporcionais ou de c\u00e2mara de \u00edons.<\/span><\/li>\n<li><strong><span>Eletr\u00f4nica mais simples<\/span><\/strong><span>\u00a0.\u00a0Os detectores GM podem ser usados \u200b\u200bcom pacotes eletr\u00f4nicos mais simples.\u00a0A<\/span><br \/>\n<span>sensibilidade de\u00a0entrada\u00a0de um instrumento de pesquisa GM t\u00edpico \u00e9 de 300 a 800 milivolts, enquanto a<\/span><br \/>\n<span>sensibilidade de\u00a0entrada\u00a0de um instrumento de pesquisa proporcional t\u00edpico \u00e9 de 2 milivolt.<\/span><\/li>\n<\/ul>\n<h3><span>Desvantagens do contador Geiger-Mueller<\/span><\/h3>\n<ul>\n<li><strong><span>Sem identifica\u00e7\u00e3o de part\u00edculas, sem resolu\u00e7\u00e3o de energia<\/span><\/strong><span>\u00a0.\u00a0Como a altura do pulso \u00e9 independente do tipo e energia da radia\u00e7\u00e3o, a discrimina\u00e7\u00e3o n\u00e3o \u00e9 poss\u00edvel.\u00a0N\u00e3o h\u00e1 informa\u00e7\u00f5es sobre a natureza da ioniza\u00e7\u00e3o que causou o pulso.\u00a0Os detectores GM n\u00e3o podem discriminar diferentes tipos de radia\u00e7\u00e3o (\u03b1, \u03b2, \u03b3), nem contra v\u00e1rias energias de radia\u00e7\u00e3o.\u00a0Isso ocorre porque o tamanho da avalanche \u00e9 independente da ioniza\u00e7\u00e3o prim\u00e1ria que a criou.<\/span><\/li>\n<li><strong><span>Tempo morto<\/span><\/strong><span>\u00a0.\u00a0Devido \u00e0 grande avalanche induzida por qualquer ioniza\u00e7\u00e3o, um contador Geiger leva muito tempo (cerca de 1 ms) para se recuperar entre pulsos sucessivos.\u00a0Portanto, os contadores Geiger n\u00e3o conseguem medir altas taxas de radia\u00e7\u00e3o devido ao &#8221;\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/detectors-of-ionization-radiation\/dead-time-of-detectors\/\"><strong><span>tempo morto<\/span><\/strong><\/a><span>\u00a0&#8221; do tubo.<\/span><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\">\n<h2><span>Contador proporcional<\/span><\/h2>\n<p><span>Um\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/proportional-counter-proportional-detector\/\"><strong><span>contador proporcional<\/span><\/strong><\/a><span>\u00a0, tamb\u00e9m conhecido como\u00a0\u00a0<\/span><strong><span>detector proporcional<\/span><\/strong><span>\u00a0, \u00e9 um dispositivo el\u00e9trico que detecta v\u00e1rios tipos de radia\u00e7\u00e3o ionizante.\u00a0A tens\u00e3o do detector \u00e9 ajustada para que as condi\u00e7\u00f5es correspondam \u00e0\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/operating-regions-of-ionizing-detectors-detector-voltage\/proportional-region-ionization-detector\/\"><span>regi\u00e3o proporcional<\/span><\/a><span>\u00a0.\u00a0Nesta regi\u00e3o, a voltagem \u00e9 alta o suficiente para fornecer aos el\u00e9trons prim\u00e1rios acelera\u00e7\u00e3o e energia suficientes para que eles possam ionizar \u00e1tomos adicionais do meio.\u00a0Esses \u00edons secund\u00e1rios (\u00a0<\/span><strong><span>amplifica\u00e7\u00e3o de g\u00e1s<\/span><\/strong><span>\u00a0) formados tamb\u00e9m s\u00e3o acelerados, causando um efeito conhecido como\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/operating-regions-of-ionizing-detectors-detector-voltage\/townsend-avalanche\/\"><strong><span>avalanches de Townsend<\/span><\/strong><\/a><span>\u00a0, que cria um \u00fanico pulso el\u00e9trico grande.<\/span><\/p>\n<h3><span>Vantagens dos contadores proporcionais<\/span><\/h3>\n<ul>\n<li><strong><span>Amplifica\u00e7\u00e3o<\/span><\/strong><span>\u00a0.\u00a0Os contadores proporcionais gasosos geralmente operam em campos el\u00e9tricos altos da ordem de 10 kV \/ cm e atingem\u00a0<\/span><strong><span>fatores de amplifica\u00e7\u00e3o<\/span><\/strong><span>\u00a0t\u00edpicos\u00a0\u00a0<strong>de cerca de 10\u00a0<\/strong><strong><sup>5<\/sup><\/strong>\u00a0.\u00a0Como o fator de amplifica\u00e7\u00e3o depende fortemente da tens\u00e3o aplicada, a carga coletada (sinal de sa\u00edda) tamb\u00e9m depende da tens\u00e3o aplicada e os contadores proporcionais requerem tens\u00e3o constante.\u00a0O alto fator de amplifica\u00e7\u00e3o do contador proporcional \u00e9 a principal vantagem sobre a c\u00e2mara de ioniza\u00e7\u00e3o.<\/span><\/li>\n<li><strong><span>Sensibilidade<\/span><\/strong><span>\u00a0.\u00a0O processo de amplifica\u00e7\u00e3o de carga melhora muito a rela\u00e7\u00e3o\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/detectors-of-ionization-radiation\/signal-to-noise-ratio\/\"><span>sinal \/ ru\u00eddo<\/span><\/a><span>\u00a0\u00a0do detector e reduz a amplifica\u00e7\u00e3o eletr\u00f4nica subsequente necess\u00e1ria.\u00a0Como o processo de amplifica\u00e7\u00e3o de carga melhora muito a rela\u00e7\u00e3o sinal \/ ru\u00eddo do detector, a amplifica\u00e7\u00e3o eletr\u00f4nica subsequente geralmente n\u00e3o \u00e9 necess\u00e1ria.\u00a0Os instrumentos proporcionais de detec\u00e7\u00e3o de contadores s\u00e3o muito sens\u00edveis a baixos n\u00edveis de radia\u00e7\u00e3o.\u00a0Al\u00e9m disso, ao medir a sa\u00edda de corrente, um detector proporcional \u00e9 \u00fatil para taxas de dose,<\/span><br \/>\n<span>uma vez que o sinal de sa\u00edda \u00e9 proporcional \u00e0 energia depositada por ioniza\u00e7\u00e3o e, portanto, proporcional \u00e0 taxa de dose.<\/span><\/li>\n<li><strong><span>Espectroscopia<\/span><\/strong><span>\u00a0.\u00a0Por arranjos funcionais adequados, modifica\u00e7\u00f5es e polariza\u00e7\u00e3o, o contador proporcional pode ser usado para detectar radia\u00e7\u00e3o alfa, beta, gama ou n\u00eautron em campos de radia\u00e7\u00e3o mista.\u00a0Al\u00e9m disso, os contadores proporcionais s\u00e3o capazes de\u00a0\u00a0<\/span><strong><span>identificar part\u00edculas<\/span><\/strong><span>\u00a0\u00a0e medir energia (espectroscopia).\u00a0A altura do pulso reflete a energia depositada pela radia\u00e7\u00e3o incidente no g\u00e1s do detector.\u00a0Como tal, \u00e9 poss\u00edvel distinguir os pulsos maiores produzidos pelas\u00a0\u00a0<\/span><a 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\u00a0dos pulsos menores produzidos pelas\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/beta-particle\/\"><span>part\u00edculas beta<\/span><\/a><span>\u00a0\u00a0ou\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/photon\/gamma-ray\/\"><span>raios gama<\/span><\/a><span>\u00a0.<\/span><\/li>\n<\/ul>\n<h3><span>Desvantagens dos contadores proporcionais<\/span><\/h3>\n<ul>\n<li><strong><span>Tens\u00e3o constante<\/span><\/strong><span>\u00a0.\u00a0Quando os instrumentos s\u00e3o operados na regi\u00e3o proporcional, a\u00a0\u00a0<\/span><strong><span>tens\u00e3o deve ser mantida constante<\/span><\/strong><span>\u00a0.\u00a0Se uma tens\u00e3o permanecer constante, o fator de amplifica\u00e7\u00e3o do g\u00e1s tamb\u00e9m n\u00e3o muda.\u00a0A principal desvantagem do uso de contadores proporcionais em instrumentos port\u00e1teis \u00e9 que eles requerem uma fonte de alimenta\u00e7\u00e3o e um amplificador muito est\u00e1veis \u200b\u200bpara garantir condi\u00e7\u00f5es operacionais constantes (no meio da regi\u00e3o proporcional).\u00a0Isso \u00e9 dif\u00edcil de fornecer em um instrumento port\u00e1til, e \u00e9 por isso que os contadores proporcionais tendem a ser mais utilizados em instrumentos fixos ou de laborat\u00f3rio.<\/span><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-detection\/gaseous-ionization-detector\/proportional-counter-proportional-detector\/quenching-proportional-counters\/\"><strong><span>T\u00eampera<\/span><\/strong><\/a><span>\u00a0.\u00a0Para cada el\u00e9tron coletado na c\u00e2mara, resta um \u00edon de g\u00e1s carregado positivamente.\u00a0Esses \u00edons gasosos s\u00e3o pesados \u200b\u200bem compara\u00e7\u00e3o com um el\u00e9tron e se movem muito mais lentamente.\u00a0Os el\u00e9trons livres s\u00e3o muito mais leves que os \u00edons positivos; portanto, eles s\u00e3o atra\u00eddos para o eletrodo central positivo muito mais rapidamente do que os \u00edons positivos s\u00e3o atra\u00eddos para a parede da c\u00e2mara.\u00a0A nuvem resultante de \u00edons positivos pr\u00f3ximos ao eletrodo leva a distor\u00e7\u00f5es na multiplica\u00e7\u00e3o de gases.\u00a0Na pr\u00e1tica, o t\u00e9rmino da avalanche \u00e9 melhorado pelo uso det\u00e9cnicasde \u201c<\/span><strong><span>\u00a0extin\u00e7\u00e3o<\/span><\/strong><span>\u00a0\u201d.<\/span><\/li>\n<\/ul>\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<figure id=\"attachment_26092\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-26092\"><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Gaseous-Ionization-Detectors-Regions-min.png\"><img loading=\"lazy\" class=\"size-large wp-image-26092 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Gaseous-Ionization-Detectors-Regions-min-1024x603.png\" alt=\"Detectores de ioniza\u00e7\u00e3o gasosa - Regi\u00f5es\" width=\"1024\" height=\"603\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Gaseous-Ionization-Detectors-Regions-min-1024x603.png\" \/><\/a><figcaption id=\"caption-attachment-26092\" class=\"wp-caption-text\"><span>Este diagrama mostra o n\u00famero de pares de \u00edons gerados no detector a g\u00e1s, que varia de acordo com a tens\u00e3o aplicada \u00e0 radia\u00e7\u00e3o incidente constante.\u00a0As tens\u00f5es podem variar amplamente, dependendo da geometria do detector e do tipo e press\u00e3o do g\u00e1s.\u00a0Esta figura indica esquematicamente as diferentes regi\u00f5es de tens\u00e3o dos raios alfa, beta e gama.\u00a0Existem seis principais regi\u00f5es operacionais pr\u00e1ticas, nas quais tr\u00eas (regi\u00e3o de ioniza\u00e7\u00e3o, proporcional e Geiger-Mueller) s\u00e3o \u00fateis para detectar radia\u00e7\u00e3o ionizante.\u00a0As 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 \u00edons por alfa do que beta e gama, mas as part\u00edculas n\u00e3o podem ser diferenciadas.\u00a0Mais corrente \u00e9 produzida na regi\u00e3o de contagem proporcional por part\u00edculas alfa que beta,\u00a0mas, pela natureza da contagem proporcional, \u00e9 poss\u00edvel diferenciar pulsos alfa, beta e gama.\u00a0Na regi\u00e3o de Geiger, n\u00e3o h\u00e1 diferencia\u00e7\u00e3o de alfa e beta, pois qualquer evento de ioniza\u00e7\u00e3o isolado no g\u00e1s resulta na mesma sa\u00edda de corrente.<\/span><\/figcaption><\/figure>\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-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><\/div>\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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Em geral, o contador Geiger e tamb\u00e9m o contador proporcional s\u00e3o tipos de detectores de ioniza\u00e7\u00e3o gasosa. Contadores proporcionais ou Geiger s\u00e3o quase sempre usados \u200b\u200bno modo de pulso. Dosimetria de Radia\u00e7\u00e3o Em geral, o contador Geiger e tamb\u00e9m o contador proporcional s\u00e3o tipos de\u00a0\u00a0detectores de ioniza\u00e7\u00e3o gasosa.\u00a0Estes podem ser classificados de acordo com a &#8230; <a title=\"O que \u00e9 o contador Geiger vs contador proporcional &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/\" aria-label=\"More on O que \u00e9 o contador Geiger vs contador proporcional &#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 o contador Geiger vs contador proporcional - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Em geral, o contador Geiger e tamb\u00e9m o contador proporcional s\u00e3o tipos de detectores de ioniza\u00e7\u00e3o gasosa. Contadores proporcionais ou Geiger s\u00e3o quase sempre usados no modo de pulso. Dosimetria de Radia\u00e7\u00e3o\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O que \u00e9 o contador Geiger vs contador proporcional - Defini\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Em geral, o contador Geiger e tamb\u00e9m o contador proporcional s\u00e3o tipos de detectores de ioniza\u00e7\u00e3o gasosa. Contadores proporcionais ou Geiger s\u00e3o quase sempre usados no modo de pulso. Dosimetria de Radia\u00e7\u00e3o\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/\" \/>\n<meta property=\"og:site_name\" content=\"Radiation Dosimetry\" \/>\n<meta property=\"article:published_time\" content=\"2020-06-21T19:36:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-07-22T05:33:35+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Gaseous-Ionization-Detectors-Regions-min-1024x603.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\">\n\t<meta name=\"twitter:data1\" content=\"Nick Connor\">\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\">\n\t<meta name=\"twitter:data2\" content=\"6 minutos\">\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.radiation-dosimetry.org\/#website\",\"url\":\"https:\/\/www.radiation-dosimetry.org\/\",\"name\":\"Radiation Dosimetry\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/www.radiation-dosimetry.org\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-BR\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/#primaryimage\",\"inLanguage\":\"pt-BR\",\"url\":\"\",\"caption\":\"Dieses Diagramm zeigt die Anzahl der im gasgef\\u00fcllten Detektor erzeugten Ionenpaare, die je nach angelegter Spannung f\\u00fcr konstant einfallende Strahlung variiert. Die Spannungen k\\u00f6nnen in Abh\\u00e4ngigkeit von der Detektorgeometrie und der Gasart und dem Druck stark variieren. Diese Abbildung zeigt schematisch die verschiedenen Spannungsbereiche f\\u00fcr Alpha-, Beta- und Gammastrahlen. Es gibt sechs praktische Hauptbetriebsbereiche, in denen drei (Ionisations-, Proportional- und Geiger-M\\u00fcller-Bereich) n\\u00fctzlich sind, um ionisierende Strahlung zu erfassen. Alphateilchen sind ionisierender als Betateilchen und als Gammastrahlen, so dass durch Alpha mehr Strom in der Ionenkammerregion erzeugt wird als durch Beta und Gamma, aber die Teilchen k\\u00f6nnen nicht unterschieden werden. Im Proportionalz\\u00e4hlbereich wird durch Alphateilchen mehr Strom erzeugt als durch Beta, aber durch die Art des Proportionalz\\u00e4hlens ist es m\\u00f6glich, Alpha-, Beta- und Gamma-Impulse zu unterscheiden. In der Geigerregion gibt es keine Unterscheidung zwischen Alpha und Beta, da ein einzelnes Ionisationsereignis im Gas zur gleichen Stromabgabe f\\u00fchrt.\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/#webpage\",\"url\":\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/\",\"name\":\"O que \\u00e9 o contador Geiger vs contador proporcional - Defini\\u00e7\\u00e3o\",\"isPartOf\":{\"@id\":\"https:\/\/www.radiation-dosimetry.org\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/#primaryimage\"},\"datePublished\":\"2020-06-21T19:36:55+00:00\",\"dateModified\":\"2020-07-22T05:33:35+00:00\",\"author\":{\"@id\":\"https:\/\/www.radiation-dosimetry.org\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\"},\"description\":\"Em geral, o contador Geiger e tamb\\u00e9m o contador proporcional s\\u00e3o tipos de detectores de ioniza\\u00e7\\u00e3o gasosa. Contadores proporcionais ou Geiger s\\u00e3o quase sempre usados no modo de pulso. Dosimetria de Radia\\u00e7\\u00e3o\",\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.radiation-dosimetry.org\/pt-br\/o-que-e-o-contador-geiger-vs-contador-proporcional-definicao\/\"]}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.radiation-dosimetry.org\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\",\"name\":\"Nick Connor\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","_links":{"self":[{"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/posts\/17798"}],"collection":[{"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/comments?post=17798"}],"version-history":[{"count":0,"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/posts\/17798\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/media?parent=17798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/categories?post=17798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.radiation-dosimetry.org\/pt-br\/wp-json\/wp\/v2\/tags?post=17798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}