{"id":3453,"date":"2026-10-29T16:13:34","date_gmt":"2026-10-29T16:13:34","guid":{"rendered":"https:\/\/swissdaily.ch\/detection-radioactivite-aeroportee\/"},"modified":"2026-10-29T16:13:34","modified_gmt":"2026-10-29T16:13:34","slug":"detection-radioactivite-aeroportee","status":"publish","type":"post","link":"https:\/\/swissdaily.ch\/de\/detection-radioactivite-aeroportee\/","title":{"rendered":"L’Institut Paul Scherrer r\u00e9volutionne la d\u00e9tection a\u00e9roport\u00e9e de la radioactivit\u00e9"},"content":{"rendered":"

Par un matin brumeux sur les contreforts des Alpes, un h\u00e9licopt\u00e8re \u00e9quip\u00e9 de d\u00e9tecteurs sp\u00e9cialis\u00e9s survole lentement le territoire suisse, cherchant \u00e0 cartographier l’invisible : le rayonnement gamma \u00e9mis par des substances radioactives dissimul\u00e9es sous la surface ou dispers\u00e9es dans l’environnement. Ce type de mission, \u00e0 la fois technique et strat\u00e9gique, constitue un maillon essentiel de la surveillance radiologique nationale. C’est pr\u00e9cis\u00e9ment dans ce domaine que l’Institut Paul Scherrer (PSI)<\/strong>, le principal laboratoire de recherche multidisciplinaire de la Conf\u00e9d\u00e9ration suisse fond\u00e9 en 1988, vient d’accomplir une avanc\u00e9e significative.<\/p>\n<\/p>\n

Les chercheurs du PSI ont mis au point une nouvelle m\u00e9thode de calcul qui permet de localiser et d’identifier des substances radioactives depuis des a\u00e9ronefs en quelques secondes, l\u00e0 o\u00f9 les proc\u00e9dures ant\u00e9rieures exigeaient plusieurs heures, voire plusieurs jours de traitement informatique. L’annonce, faite lundi par l’institut, s’appuie sur des r\u00e9sultats publi\u00e9s dans la revue scientifique de r\u00e9f\u00e9rence Nature Communications<\/em><\/strong>, ce qui conf\u00e8re \u00e0 cette perc\u00e9e une validation par les pairs d’une rigueur incontestable. La rapidit\u00e9 d’analyse ainsi obtenue modifie substantiellement les capacit\u00e9s op\u00e9rationnelles disponibles en cas d’urgence nucl\u00e9aire ou radiologique.<\/p>\n<\/p>\n

Le d\u00e9fi technique que cette m\u00e9thode r\u00e9sout est loin d’\u00eatre trivial. Lorsque des d\u00e9tecteurs embarqu\u00e9s \u00e0 bord d’h\u00e9licopt\u00e8res mesurent le rayonnement gamma, le spectre d’\u00e9nergie capt\u00e9 permet en th\u00e9orie d’identifier la nature des substances radioactives pr\u00e9sentes et d’en estimer la quantit\u00e9. Cependant, l’air travers\u00e9 par le rayonnement et les surfaces m\u00e9talliques internes de l’appareil alt\u00e8rent ce signal de mani\u00e8re complexe, introduisant des distorsions qui compliquent consid\u00e9rablement l’interpr\u00e9tation des donn\u00e9es brutes. Jusqu’\u00e0 pr\u00e9sent, les \u00e9quipes scientifiques devaient recourir \u00e0 des simulations informatiques lourdes pour corriger ces effets, un processus dont la dur\u00e9e rendait toute r\u00e9ponse en temps r\u00e9el pratiquement impossible.<\/p>\n<\/p>\n

La solution d\u00e9velopp\u00e9e au PSI repose sur une architecture m\u00e9thodologique en deux temps. La simulation est d\u00e9sormais fractionn\u00e9e en deux composantes distinctes, puis combin\u00e9e \u00e0 une approche statistique connue sous le nom de mod\u00e9lisation bay\u00e9sienne<\/strong>. Cette technique probabiliste permet d’affiner l’analyse du spectre mesur\u00e9 m\u00eame dans les conditions les plus d\u00e9favorables, notamment lorsque seules quelques particules de rayonnement parviennent effectivement au d\u00e9tecteur \u2014 une situation fr\u00e9quente lors de survols \u00e0 haute altitude ou face \u00e0 des sources de faible intensit\u00e9. Le r\u00e9sultat est une identification plus rapide et plus pr\u00e9cise, tant en termes de nature de la substance que de sa localisation g\u00e9ographique.<\/p>\n<\/p>\n

Les implications pratiques s’\u00e9tendent bien au-del\u00e0 de la gestion de crise nucl\u00e9aire. La m\u00e9thode trouve une application directe dans les vols de mesure r\u00e9guliers que la Suisse conduit pour surveiller la radioactivit\u00e9 ambiante sur son territoire, une obligation \u00e0 la fois r\u00e9glementaire et de souverainet\u00e9 dans un pays qui exploite des centrales nucl\u00e9aires et entretient un Finanzplatz<\/strong> sensible aux risques syst\u00e9miques de toute nature. Par ailleurs, les chercheurs identifient des d\u00e9bouch\u00e9s dans les \u00e9tudes g\u00e9ophysiques du sous-sol, o\u00f9 la d\u00e9tection de rayonnements naturels permet de caract\u00e9riser les formations g\u00e9ologiques, ainsi que dans le cadre des missions de surveillance des mati\u00e8res nucl\u00e9aires conduites par l’Agence internationale de l’\u00e9nergie atomique (AIEA)<\/strong>.<\/p>\n<\/p>\n

\u00c0 l’\u00e9chelle internationale, cette avanc\u00e9e positionne la Suisse \u2014 et le PSI en particulier \u2014 comme un acteur de premier plan dans le domaine de la physique des d\u00e9tecteurs et de la s\u00e9curit\u00e9 radiologique. Dans un contexte o\u00f9 plusieurs \u00c9tats renforcent leurs capacit\u00e9s de surveillance nucl\u00e9aire, notamment en r\u00e9ponse \u00e0 des tensions g\u00e9opolitiques accrues, la ma\u00eetrise d’outils d’analyse rapide et fiable repr\u00e9sente un atout strat\u00e9gique autant que scientifique. Le fait que ces travaux \u00e9manent d’un laboratoire f\u00e9d\u00e9ral suisse, structurellement ind\u00e9pendant des logiques industrielles ou militaires des grandes puissances, leur conf\u00e8re une cr\u00e9dibilit\u00e9 particuli\u00e8re sur la sc\u00e8ne internationale.<\/p>","protected":false},"excerpt":{"rendered":"

Par un matin brumeux sur les contreforts des Alpes, un h\u00e9licopt\u00e8re \u00e9quip\u00e9 de d\u00e9tecteurs sp\u00e9cialis\u00e9s survole lentement le territoire suisse, cherchant \u00e0 cartographier l’invisible : le rayonnement gamma \u00e9mis par des substances radioactives dissimul\u00e9es sous la surface ou dispers\u00e9es dans l’environnement. Ce type de mission, \u00e0 la fois technique et strat\u00e9gique, constitue un maillon essentiel […]<\/p>\n","protected":false},"author":4,"featured_media":3452,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,7],"tags":[],"class_list":["post-3453","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-culture"],"yoast_head":"\nPSI r\u00e9volutionne la d\u00e9tection a\u00e9roport\u00e9e de radioactivit\u00e9<\/title>\n<meta name=\"description\" content=\"L'Institut Paul Scherrer innove en d\u00e9tection gamma a\u00e9roport\u00e9e. 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