{"id":6734,"date":"2025-05-30T11:28:49","date_gmt":"2025-05-30T17:28:49","guid":{"rendered":"https:\/\/www.crpa-acrp-bulletin.ca\/?p=6734"},"modified":"2025-05-30T11:28:49","modified_gmt":"2025-05-30T17:28:49","slug":"coin-du-specialiste-de-la-radioprotection-mai-2025","status":"publish","type":"post","link":"https:\/\/www.crpa-acrp-bulletin.ca\/fr\/2025\/05\/30\/coin-du-specialiste-de-la-radioprotection-mai-2025\/","title":{"rendered":"Coin du sp\u00e9cialiste de la radioprotection, mai 2025"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5656 size-full alignnone\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Coin-du-specialiste-de-la-radioprotection-FR-header.png\" alt=\"\" width=\"539\" height=\"171\" srcset=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Coin-du-specialiste-de-la-radioprotection-FR-header.png 539w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Coin-du-specialiste-de-la-radioprotection-FR-header-300x95.png 300w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Coin-du-specialiste-de-la-radioprotection-FR-header-520x165.png 520w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Coin-du-specialiste-de-la-radioprotection-FR-header-320x102.png 320w\" sizes=\"auto, (max-width: 539px) 100vw, 539px\" \/><\/p>\n<h1 style=\"font-weight: 400;\">V\u00e9rification de l\u2019activit\u00e9 estim\u00e9e du minerai de monazite<\/h1>\n<p style=\"font-weight: 400;\">Bienvenue \u00e0 nouveau au Coin du sp\u00e9cialiste de la radioprotection\u2009!<\/p>\n<p>Dans ce num\u00e9ro, vous recevez un \u00e9chantillon de minerai de monazite qui contient suppos\u00e9ment 10 MBq de Th\u00a0232. Vous voulez v\u00e9rifier la fiabilit\u00e9 de l\u2019activit\u00e9 estim\u00e9e en mesurant le d\u00e9bit de dose gamma en utilisant un gammam\u00e8tre correctement calibr\u00e9.<\/p>\n<h2>Question<\/h2>\n<p>La constante gamma (\u0413) de l\u2019\u00e9quivalent de dose ambiant pour le Th\u00a0232 est 3,42E-5 \u00b5Sv m<sup>2<\/sup>\/h\/MBq. Vous estimez que le d\u00e9bit de dose \u00e0 un m\u00e8tre devrait \u00eatre comme suit\u00a0:<\/p>\n<ul>\n<li>H*(10) = 3,42E-5 \u00b5Sv m<sup>2<\/sup>\/h\/MBq \u00d7 10 MBq \u00d7 (1 m \/ 1 m)<sup>2<\/sup><\/li>\n<li>H*(10) = 3,42E-4 \u00b5Sv\/h<\/li>\n<\/ul>\n<p>Ce qui est essentiellement z\u00e9ro.<\/p>\n<p>Vous d\u00e9cidez d\u2019essayer de mesurer \u00e0 10\u00a0cm, ce qui devrait augmenter cette valeur par un facteur de 100 pour obtenir 0,034 \u00b5Sv\/h. C\u2019est la limite de d\u00e9tection de votre instrument au-dessus du bruit de fond.<\/p>\n<p>Lorsque vous essayez de mesurer, vous obtenez plus de 1\u2009000\u00a0fois la valeur attendue. Pourquoi?<\/p>\n<p style=\"font-weight: 400;\"><strong>        <div class=\"rmwr-wrapper\"\r\n             data-id=\"rmwr-p6734-1\"\r\n                          data-key=\"p6734-1\"\r\n                          data-post=\"6734\"\r\n                          data-animation=\"none\"\r\n                          data-duration=\"300\"\r\n                          data-mode=\"normal\"\r\n                          data-lazy=\"false\"\r\n                          data-smooth-scroll=\"true\"\r\n                          data-scroll-offset=\"0\"\r\n             >\r\n            <button\r\n                type=\"button\"\r\n                class=\"read-link \"\r\n                id=\"readlinkrmwr-p6734-1\"\r\n                data-open-text=\"Show Answer\"\r\n                data-close-text=\"Hide Answer\"\r\n                                aria-expanded=\"false\"\r\n                aria-controls=\"readrmwr-p6734-1\"\r\n            >\r\n                                <span class=\"rmwr-text\">Show Answer<\/span>\r\n            <\/button>\r\n            <div\r\n                class=\"read_div\"\r\n                id=\"readrmwr-p6734-1\"\r\n                aria-hidden=\"true\"\r\n                style=\"display: none;\"\r\n            >\r\n                                    <\/strong><\/p>\n<h2 style=\"font-weight: 400\">R\u00e9ponse<\/h2>\n<p>Comme toutes les mati\u00e8res naturellement radioactives, le Th\u00a0232 poss\u00e8de une dur\u00e9e de vie extr\u00eamement longue (T\u00bd = 1,4 \u00d7 1010\u00a0ann\u00e9es).<\/p>\n<p>Il poss\u00e8de \u00e9galement une cha\u00eene de d\u00e9croissance complexe avec onze produits de filiation notables, qui ont tous une demi-vie de moins de 100\u00a0ans et qui existent donc en \u00e9quilibre avec le Th\u00a0232. Parmi ceux-ci, neuf produits de filiation auront la m\u00eame activit\u00e9 que le Th\u00a0232, tandis que les deux autres produits de filiation poss\u00e8dent respectivement 64\u00a0% et 36\u00a0% de l\u2019activit\u00e9 du Th\u00a0232 en raison de leurs rapports de branchement.<\/p>\n<p>Plusieurs de ces isotopes sont des \u00e9metteurs gamma beaucoup plus puissants que le Th\u00a0232. Les constantes gamma pour d\u2019un isotope donn\u00e9 ne tiennent normalement pas compte des gamma des produits de d\u00e9croissance. En effet, seules les \u00e9missions des isotopes parents sont incluses.<\/p>\n<p>Dans ce cas, les principaux contributeurs au d\u00e9bit de dose gamma des produits de filiation sont les suivants\u00a0:<\/p>\n<ul>\n<li>Ac\u00a0228\u00a0: A = 10 MBq, \u0413 = 0,145 \u00b5Sv m<sup>2<\/sup>\/h\/MBq<\/li>\n<li>Pb\u00a0212\u00a0: A = 10 MBq, \u0413 = 0,0252 \u00b5Sv m<sup>2<\/sup>\/h\/MBq<\/li>\n<li>Bi\u00a0212\u00a0: A = 10 MBq, \u0413 = 0,0159 \u00b5Sv m<sup>2<\/sup>\/h\/MBq<\/li>\n<li>Tl\u00a0208\u00a0: A = 3,6 MBq, \u0413 = 0,420 \u00b5Sv m<sup>2<\/sup>\/h\/MBq<\/li>\n<\/ul>\n<p>Ainsi, le d\u00e9bit de dose attendue \u00e0 10\u00a0cm aurait d\u00fb \u00eatre\u00a0:<\/p>\n<ul>\n<li>H*(10) = [(0,145 + 0,0252 + 0,0159) \u00b5Sv m<sup>2<\/sup>\/h\/MBq \u00d7 10 MBq + (0,420) \u00b5Sv m<sup>2<\/sup>\/h\/MBq \u00d7 3,6 MBq] \u00d7 (1 m \/ 0,1 m)<sup>2<\/sup><\/li>\n<li>H*(10) = (1,86 \u00b5Sv\/h + 1,51 \u00b5Sv\/h) \u00d7\u00a0100<span class=\"Apple-converted-space\">\u00a0<\/span><\/li>\n<li>H*(10) = 337 \u00b5Sv\/h<\/li>\n<\/ul>\n                            <\/div>\r\n                    <\/div>\r\n        \n<p>&nbsp;<\/p>\n<div style=\"padding: 10px 10px 0 10px; background-color: #eeeeee; border: #dddddd 2px solid;\">\n<h2><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-5647 size-thumbnail\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Jeff-Sandeman-bio-pic-cropped-150x150.png\" alt=\"\" width=\"150\" height=\"150\" srcset=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Jeff-Sandeman-bio-pic-cropped-150x150.png 150w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Jeff-Sandeman-bio-pic-cropped-80x80.png 80w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/Jeff-Sandeman-bio-pic-cropped-244x245.png 244w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/>Jeff Sandeman<\/h2>\n<p>Jeff\u00a0se d\u00e9crit comme un \u00ab\u00a0vieux rousp\u00e9teur grognon\u00a0\u00bb qui a pris sa retraite de la division des acc\u00e9l\u00e9rateurs et des installations de classe\u00a0II de la CCSN en janvier\u00a02021 apr\u00e8s 17\u00a0ans au sein de la division. Avant \u00e7a, il a pass\u00e9 20\u00a0ans chez ActionCancer Manitoba. Durant ses derni\u00e8res ann\u00e9es \u00e0 cet endroit, il a \u00e9t\u00e9 responsable de la radioprotection pour les installations de radioth\u00e9rapie.<\/p>\n<p>Tout au long de ses deux carri\u00e8res, il a eu de nombreuses occasions d\u2019explorer une vaste gamme de sujets li\u00e9s \u00e0 la radioprotection, y compris les rayons\u00a0X non ionisants, de diagnostic, la m\u00e9decine nucl\u00e9aire, la radioth\u00e9rapie m\u00e9dicale, la production d\u2019isotopes par cyclotron et m\u00eame les acc\u00e9l\u00e9rateurs de recherche \u00e0 haute \u00e9nergie. Pour une raison \u00e9trange, les deux \u00e9tablissements lui ont aussi permis d\u2019enseigner les fondements de la radioprotection et la conception de protection contre les rayonnements et d\u2019offrir du mentorat (corrompre) les jeunes membres du personnel. Le point culminant de sa vie professionnelle a \u00e9t\u00e9 en 2020 quand l\u2019ACRP lui a remis le <a href=\"https:\/\/www.crpa-acrp-bulletin.ca\/fr\/2020\/07\/08\/laureats-2020-de-lacrp\/\">Prix de fondateur comm\u00e9moratif Richard V.\u00a0Osborne<\/a>.<\/p>\n<p><span style=\"font-weight: 400;\">Maintenant que Jeff est \u00e0 la retraite, il passe la majorit\u00e9 de son temps \u00e0 essayer de golfer (avec peine), faire de la poussi\u00e8re dans le sous-sol (menuiserie) ou \u00e0 collectionner des morceaux de papier souill\u00e9 (c.-\u00e0-d. des timbres). Il adore le whisky \u00e9cossais single malt et en a d\u2019ailleurs plus de bouteilles que ce que son foie peut prendre. Il continue de toucher \u00e0 la radioprotection et est toujours membre de l\u2019ACRP (habituellement apr\u00e8s 18\u00a0rappels de renouveler son adh\u00e9sion puisqu\u2019il perd la m\u00e9moire en raison de son \u00e2ge).<\/span><\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<div style=\"padding: 10px 10px 10px 10px; background-color: #eeeeee; border: #dddddd 2px solid;\">\n<h2 style=\"color: #e93b25;\">Vous voulez lire d\u2019autres articles comme celui-ci ?<\/h2>\n<p>Le\u00a0<em>Bulletin<\/em> de l\u2019Association canadienne de la radioprotection (ACRP) est une publication essentielle \u00e0 tout professionnel de la radioprotection du Canada. Son contenu \u00e9ditorial procure aux professionnels de la radioprotection les enseignements, l\u2019information, les conseils et les solutions utiles, tous n\u00e9cessaires pour demeurer \u00e0 l\u2019avant-garde de la profession.<\/p>\n<p>Abonnez-vous aujourd\u2019hui pour que nous vous envoyions un courriel chaque fois qu\u2019un nouveau num\u00e9ro est mis en ligne. Revisitez souvent le site entre chaque num\u00e9ro pour obtenir les mises \u00e0 jour et consulter de nouveaux articles.<\/p>\n<p>Ne ratez aucun num\u00e9ro. Abonnez-vous d\u00e8s aujourd\u2019hui !<\/p>\n<a class=\"maxbutton-3 maxbutton maxbutton-abonnez-vous\" target=\"_blank\" title=\"Abonnez-vous !\" rel=\"noopener\" href=\"https:\/\/mailchi.mp\/3cpublications\/5baszj3vti\"><span class='mb-text'>Abonnez-vous<\/span><\/a>\n<\/div>\n<p style=\"font-weight: 400;\">\n","protected":false},"excerpt":{"rendered":"<p>Dans sa rubrique Coin du sp\u00e9cialiste de la radioprotection, Jeff v\u00e9rifie l\u2019activit\u00e9 estim\u00e9e du minerai de monazite qui contient suppos\u00e9ment 10 MBq de Th 232. Si la constante gamma de l\u2019\u00e9quivalent de dose ambiant pour le Th 232 est pratiquement z\u00e9ro, pourquoi la mesure \u00e0 10 cm est-elle plus de 1\u2009000 fois plus \u00e9lev\u00e9e que ce \u00e0 quoi l\u2019on pourrait s\u2019attendre?<\/p>\n","protected":false},"author":128,"featured_media":6637,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[28],"tags":[],"class_list":["post-6734","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chroniques-regulieres-fr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Coin du sp\u00e9cialiste de la radioprotection, mai 2025 - CRPA-ACRP Bulletin<\/title>\n<meta name=\"description\" content=\"Dans sa rubrique Coin du sp\u00e9cialiste de la radioprotection, Jeff v\u00e9rifie 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