{"id":21333,"date":"2020-07-15T18:16:11","date_gmt":"2020-07-15T18:16:11","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/quest-ce-que-le-calcul-de-la-dose-equivalente-probleme-definition\/"},"modified":"2020-07-15T18:16:11","modified_gmt":"2020-07-15T18:16:11","slug":"quest-ce-que-le-calcul-de-la-dose-equivalente-probleme-definition","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/fr\/quest-ce-que-le-calcul-de-la-dose-equivalente-probleme-definition\/","title":{"rendered":"Qu&rsquo;est-ce que le calcul de la dose \u00e9quivalente &#8211; Probl\u00e8me &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-u-clearfix su-u-trim\">Calculez le d\u00e9bit de dose de photons primaires, en gray par heure (Gy.h-1), \u00e0 la surface ext\u00e9rieure d&rsquo;un blindage en plomb de 5 cm d&rsquo;\u00e9paisseur.\u00a0Calculez ensuite le d\u00e9bit de dose \u00e9quivalent.\u00a0Supposons que ce champ de rayonnement externe p\u00e9n\u00e8tre uniform\u00e9ment dans tout le corps.\u00a0Dosim\u00e9trie des rayonnements<\/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 href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-definition-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-25395 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-definition-min-300x267.png\" alt=\"dose \u00e9quivalente - d\u00e9finition\" width=\"300\" height=\"267\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-definition-min-300x267.png\" \/><\/a>La dose \u00e9quivalente<\/strong>\u00a0(symbole\u00a0<strong>H\u00a0<sub>T<\/sub>\u00a0)<\/strong>\u00a0est une quantit\u00e9 de dose calcul\u00e9e pour chaque organe (indice T &#8211; tissu).\u00a0<strong>La dose \u00e9quivalente<\/strong>\u00a0est bas\u00e9e sur la dose absorb\u00e9e par un organe, ajust\u00e9e pour tenir compte de l&rsquo;\u00a0<strong>efficacit\u00e9 du type de rayonnement<\/strong>\u00a0.\u00a0Dose \u00e9quivalente est donn\u00e9e le symbole H\u00a0<sub>T<\/sub>\u00a0.\u00a0L&rsquo;unit\u00e9 SI de\u00a0<strong>H\u00a0<sub>T<\/sub><\/strong>\u00a0est le\u00a0<strong>sievert<\/strong>\u00a0(Sv) ou mais rem (roentgen \u00e9quivalent man) est encore couramment utilis\u00e9 (\u00a0<strong>1 Sv = 100 rem<\/strong>\u00a0).\u00a0L&rsquo;unit\u00e9 de sievert a \u00e9t\u00e9 nomm\u00e9e d&rsquo;apr\u00e8s le scientifique su\u00e9dois Rolf Sievert, qui a effectu\u00e9 une grande partie des premiers travaux sur la dosim\u00e9trie en radioth\u00e9rapie.<\/p>\n<h2>Calcul du d\u00e9bit de dose \u00e9quivalent<\/h2>\n<p>Supposons la\u00a0<strong>source isotrope ponctuelle<\/strong>\u00a0qui contient\u00a0<strong>1,0 Ci de\u00a0<sup>137<\/sup>\u00a0Cs<\/strong>\u00a0, qui a une\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/half-life\/\">demi-vie<\/a>\u00a0de\u00a0<strong>30,2 ans<\/strong>\u00a0.\u00a0Notez que la relation entre la demi-vie et la quantit\u00e9 de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/radionuclide-radioisotope\/\">radionucl\u00e9ide<\/a>\u00a0n\u00e9cessaire pour donner une activit\u00e9 d&rsquo;\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/radiation-protection\/units-of-radioactivity\/curie-unit-of-radioactivity\/\">un curie<\/a>\u00a0est indiqu\u00e9e ci-dessous.\u00a0Cette quantit\u00e9 de mati\u00e8re peut \u00eatre calcul\u00e9e en utilisant \u03bb, qui est la\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\">constante<\/a>\u00a0de\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/radioactive-decay-law\/decay-constant\/\">d\u00e9sint\u00e9gration<\/a>\u00a0de certains nucl\u00e9ides:<\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-24886 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\" alt=\"Curie - Unit\u00e9 d'activit\u00e9\" width=\"378\" height=\"61\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Curie-Unit-of-Activity.png\" \/><\/a><\/p>\n<p>Environ 94,6 pour cent se d\u00e9sint\u00e8gre par\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radioactive-decay\/beta-decay-beta-radioactivity\/\">\u00e9mission b\u00eata<\/a>\u00a0vers un\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/atom-properties-of-atoms\/nuclides\/isomers\/\">isom\u00e8re nucl\u00e9aire<\/a>\u00a0m\u00e9tastable\u00a0du baryum: le baryum-137m.\u00a0Le pic photonique principal de Ba-137m est de\u00a0<strong>662 keV<\/strong>\u00a0.\u00a0Pour ce calcul, supposons que toutes les d\u00e9sint\u00e9grations passent par ce canal.<\/p>\n<p><strong>Calculez le d\u00e9bit de dose de photons primaires<\/strong>\u00a0, en gray par heure (Gy.h\u00a0<sup>-1<\/sup>\u00a0), \u00e0 la surface ext\u00e9rieure d&rsquo;un blindage en plomb de 5 cm d&rsquo;\u00e9paisseur.\u00a0<strong>Calculez<\/strong>\u00a0ensuite\u00a0<strong>le\u00a0<\/strong><strong>d\u00e9bit de dose \u00e9quivalent<\/strong>\u00a0.\u00a0Supposons que ce champ de rayonnement externe p\u00e9n\u00e8tre\u00a0<strong>uniform\u00e9ment<\/strong>\u00a0dans tout le corps.\u00a0Le d\u00e9bit de dose de photons primaires n\u00e9glige toutes les particules secondaires.\u00a0Supposons que la distance effective de la source au point de dose soit de\u00a0<strong>10 cm<\/strong>\u00a0.\u00a0Nous supposerons \u00e9galement que le point de dose est un tissu mou et qu&rsquo;il peut raisonnablement \u00eatre simul\u00e9 par l&rsquo;eau et nous utilisons le coefficient d&rsquo;absorption d&rsquo;\u00e9nergie de masse pour l&rsquo;eau.<\/p>\n<p>Voir aussi:\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\">Att\u00e9nuation des rayons gamma<\/a><\/p>\n<p>Voir aussi:\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/radiation\/shielding-of-ionizing-radiation\/shielding-gamma-radiation\/\">Blindage des rayons gamma<\/a><\/p>\n<p><strong>Solution:<\/strong><\/p>\n<p>Le d\u00e9bit de dose des photons primaires est\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/interaction-radiation-matter\/interaction-gamma-radiation-matter\/gamma-ray-attenuation\/\">att\u00e9nu\u00e9 de fa\u00e7on exponentielle<\/a>\u00a0, et le d\u00e9bit de dose des photons primaires, en tenant compte du blindage, est donn\u00e9 par:<\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/dose-rate-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25304 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/dose-rate-calculation.png\" alt=\"calcul du d\u00e9bit de dose\" width=\"671\" height=\"307\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/dose-rate-calculation.png\" \/><\/a><\/p>\n<p>Comme on peut le voir, nous ne tenons pas compte de l&rsquo;accumulation de rayonnement secondaire.\u00a0Si des particules secondaires sont produites ou si le rayonnement primaire change d&rsquo;\u00e9nergie ou de direction, l&rsquo;att\u00e9nuation effective sera alors beaucoup moins importante.\u00a0Cette hypoth\u00e8se sous-estime g\u00e9n\u00e9ralement le v\u00e9ritable d\u00e9bit de dose, en particulier pour les \u00e9crans \u00e9pais et lorsque le point de dose est proche de la surface de l&rsquo;\u00e9cran, mais cette hypoth\u00e8se simplifie tous les calculs.\u00a0Dans ce cas, le v\u00e9ritable d\u00e9bit de dose (avec l&rsquo;accumulation de rayonnement secondaire) sera plus de deux fois plus \u00e9lev\u00e9.<\/p>\n<p><span>Pour calculer le\u00a0<\/span><strong><span>d\u00e9bit de dose absorb\u00e9<\/span><\/strong><span>\u00a0, nous devons utiliser dans la formule:<\/span><\/p>\n<ul>\n<li><span>k = 5,76 x 10\u00a0<\/span><sup><span>-7<\/span><\/sup><\/li>\n<li><span>S = 3,7 x 10\u00a0<\/span><sup><span>10<\/span><\/sup><span>\u00a0s\u00a0<\/span><sup><span>-1<\/span><\/sup><\/li>\n<li><span>E = 0,662 MeV<\/span><\/li>\n<li><span>\u03bc\u00a0<\/span><sub><span>t<\/span><\/sub><span>\u00a0\/ \u03c1 =\u00a0<\/span><sup>\u00a0<\/sup><span>0,0326 cm\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0\/ g (les valeurs sont disponibles au NIST)<\/span><\/li>\n<li><span>\u03bc = 1,289 cm\u00a0<\/span><sup><span>-1<\/span><\/sup><span>\u00a0(les valeurs sont disponibles au NIST)<\/span><\/li>\n<li><span>D = 5 cm<\/span><\/li>\n<li><span>r = 10 cm<\/span><\/li>\n<\/ul>\n<p><strong><span>R\u00e9sultat:<\/span><\/strong><\/p>\n<p><span>Le d\u00e9bit de dose absorb\u00e9 r\u00e9sultant en gray par heure est alors:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation-1.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25319 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation-1.png\" alt=\"d\u00e9bit de dose absorb\u00e9 - gray - calcul\" width=\"551\" height=\"153\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation-1.png\" \/><\/a><\/p>\n<p><span>\u00c9tant donn\u00e9 que le facteur de pond\u00e9ration de rayonnement pour les rayons gamma est \u00e9gal \u00e0 un et que nous avons suppos\u00e9 le champ de rayonnement uniforme, nous pouvons calculer directement le d\u00e9bit de dose \u00e9quivalent \u00e0 partir du d\u00e9bit de dose absorb\u00e9 comme suit:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-sievert-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25390 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-sievert-calculation.png\" alt=\"dose \u00e9quivalente - sievert - calcul\" width=\"463\" height=\"74\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/equivalent-dose-sievert-calculation.png\" \/><\/a><\/p>\n<p><span>Si nous voulons tenir compte de l&rsquo;accumulation de rayonnement secondaire, nous devons inclure le facteur d&rsquo;accumulation.\u00a0La\u00a0<\/span><strong><span>formule \u00e9tendue<\/span><\/strong><span>\u00a0pour le d\u00e9bit de dose est alors:<\/span><\/p>\n<p><a href=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-25303 lazy-loaded\" src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation.png\" alt=\"d\u00e9bit de dose absorb\u00e9 - gris\" width=\"693\" height=\"158\" data-lazy-type=\"image\" data-src=\"http:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/absorbed-dose-rate-gray-calculation.png\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\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>Cet article est bas\u00e9 sur la traduction automatique de l&rsquo;article original en anglais. Pour plus d&rsquo;informations, voir l&rsquo;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&rsquo;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calculez le d\u00e9bit de dose de photons primaires, en gray par heure (Gy.h-1), \u00e0 la surface ext\u00e9rieure d&rsquo;un blindage en plomb de 5 cm d&rsquo;\u00e9paisseur.\u00a0Calculez ensuite le d\u00e9bit de dose \u00e9quivalent.\u00a0Supposons que ce champ de rayonnement externe p\u00e9n\u00e8tre uniform\u00e9ment dans tout le corps.\u00a0Dosim\u00e9trie des rayonnements La dose \u00e9quivalente\u00a0(symbole\u00a0H\u00a0T\u00a0)\u00a0est une quantit\u00e9 de dose calcul\u00e9e pour chaque &#8230; <a title=\"Qu&rsquo;est-ce que le calcul de la dose \u00e9quivalente &#8211; Probl\u00e8me &#8211; D\u00e9finition\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/fr\/quest-ce-que-le-calcul-de-la-dose-equivalente-probleme-definition\/\" aria-label=\"En savoir plus sur Qu&rsquo;est-ce que le calcul de la dose \u00e9quivalente &#8211; Probl\u00e8me &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[49],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que le calcul de la dose \u00e9quivalente - Probl\u00e8me - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Calculez le d\u00e9bit de dose de photons primaires, en gris par heure (Gy.h-1), \u00e0 la surface ext\u00e9rieure d&#039;un blindage en plomb de 5 cm d&#039;\u00e9paisseur. Calculez ensuite le d\u00e9bit de dose \u00e9quivalent. Supposons que ce champ de rayonnement externe p\u00e9n\u00e8tre uniform\u00e9ment dans tout le corps. Dosim\u00e9trie des rayonnements\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.radiation-dosimetry.org\/fr\/quest-ce-que-le-calcul-de-la-dose-equivalente-probleme-definition\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Qu&#039;est-ce que le calcul de la dose \u00e9quivalente - Probl\u00e8me - D\u00e9finition\" \/>\n<meta property=\"og:description\" content=\"Calculez le d\u00e9bit de dose de photons primaires, en gris par heure (Gy.h-1), \u00e0 la surface ext\u00e9rieure d&#039;un blindage en plomb de 5 cm d&#039;\u00e9paisseur. Calculez ensuite le d\u00e9bit de dose \u00e9quivalent. 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