{"id":9470,"date":"2025-05-14T13:43:40","date_gmt":"2025-05-14T13:43:40","guid":{"rendered":"https:\/\/ciehaufr1i.wpdns.site\/csi-radiation-risks\/"},"modified":"2025-05-14T15:06:07","modified_gmt":"2025-05-14T15:06:07","slug":"csi-risques-lies-aux-radiations","status":"publish","type":"page","link":"https:\/\/car.ca\/fr\/a-propos\/associes\/csi\/csi-risques-lies-aux-radiations\/","title":{"rendered":"Risques li\u00e9s aux radiations"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Risques li\u00e9s aux radiations<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Le rapport BEIR VII<\/h3>\n\n\n\n<p>D\u00e9finit le rayonnement de&nbsp;<em>faible intensit\u00e9<\/em>&nbsp;comme une gamme allant de pr\u00e8s de z\u00e9ro \u00e0 100 milliSieverts (mSv).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>30 \u00e0 40 fois l&rsquo;exposition naturelle annuelle<\/li>\n\n\n\n<li>10 fois celle d&rsquo;un scanner<\/li>\n\n\n\n<li>1000 fois celle d&rsquo;une radiographie du thorax<\/li>\n<\/ul>\n\n\n\n<p><em><strong>Th\u00e9orie lin\u00e9aire sans seuil<\/strong><\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Selon la th\u00e9orie lin\u00e9aire sans seuil (LNT), le risque de d\u00e9velopper un cancer induit par les rayonnements (effets stochastiques) augmente avec la dose.<\/li>\n\n\n\n<li>Ce mod\u00e8le a \u00e9t\u00e9 valid\u00e9 \u00e0 des doses de radiation aigu\u00ebs plus \u00e9lev\u00e9es (&gt;100 mSv) chez les survivants de la bombe atomique.<\/li>\n\n\n\n<li>Le niveau de dose \u00e0 partir duquel le risque est significatif n&rsquo;est pas connu, mais \u00e0 des fins de radioprotection, on suppose que le risque est lin\u00e9aire jusqu&rsquo;\u00e0 la dose \u00ab\u00a00\u00a0\u00bb.<\/li>\n\n\n\n<li>Pour les expositions \u00e0 de faibles doses, \u2264100 mSv par an, le profil de risque est sujet \u00e0 discussion.<\/li>\n\n\n\n<li>Diff\u00e9rents mod\u00e8les de risques li\u00e9s \u00e0 la dose ont \u00e9t\u00e9 propos\u00e9s, allant de risques accrus \u00e0 des avantages !<\/li>\n\n\n\n<li>La&nbsp;<em>Health Physics Society<\/em>&nbsp;a r\u00e9cemment d\u00e9clar\u00e9 que la th\u00e9orie LNT ne pouvait pas \u00eatre utilis\u00e9e pour les estimations du risque de cancer.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Principe ALARA<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ind\u00e9pendamment du d\u00e9bat sur la LNT, nous devons suivre les meilleures pratiques et maintenir les expositions et les doses de rayonnement&nbsp;<em>au niveau le plus bas qu&rsquo;il soit raisonnablement possible d&rsquo;atteindre.<\/em><\/li>\n\n\n\n<li>Il s&rsquo;agit du principe&nbsp;<strong>ALARA<\/strong>, qui consiste \u00e0 tout mettre en \u0153uvre pour maintenir les expositions aux rayonnements ionisants \u00e0 un niveau aussi inf\u00e9rieur que possible aux limites de dose.<\/li>\n\n\n\n<li>En tenant compte de l&rsquo;\u00e9tat de la technologie et du co\u00fbt des am\u00e9liorations par rapport aux avantages pour la sant\u00e9 et la s\u00e9curit\u00e9 publiques.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Risques li\u00e9s aux radiations Le rapport BEIR VII D\u00e9finit le rayonnement de&nbsp;faible intensit\u00e9&nbsp;comme une gamme allant de pr\u00e8s de z\u00e9ro \u00e0 100 milliSieverts (mSv). Th\u00e9orie lin\u00e9aire sans seuil Principe ALARA<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":8937,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_searchwp_excluded":"","_uag_custom_page_level_css":"","site-sidebar-layout":"left-sidebar","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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