{"id":2583,"date":"2020-10-07T14:16:52","date_gmt":"2020-10-07T20:16:52","guid":{"rendered":"https:\/\/www.crpa-acrp-bulletin.ca\/?p=2583"},"modified":"2020-10-07T14:16:52","modified_gmt":"2020-10-07T20:16:52","slug":"message-du-president-octobre-2020","status":"publish","type":"post","link":"https:\/\/www.crpa-acrp-bulletin.ca\/fr\/2020\/10\/07\/message-du-president-octobre-2020\/","title":{"rendered":"Message du pr\u00e9sident, octobre 2020"},"content":{"rendered":"

\"Ali<\/p>\n

J\u2019esp\u00e8re que vous allez bien.<\/p>\n

Ce n\u2019est pas parce que nous devons garder nos distances que l\u2019Association canadienne de radioprotection (ACRP) doit suspendre ses projets pendant la pand\u00e9mie de COVID-19. \u00c0 titre de premier pr\u00e9sident \u00ab\u00a0\u00e0 distance\u00a0\u00bb, je d\u00e9couvre de nouveaux moyens de vous offrir diff\u00e9rentes possibilit\u00e9s. En effet, le conseil travaille fort pour offrir des activit\u00e9s aux membres dans les prochains mois, comme une assembl\u00e9e publique de la Commission canadienne de s\u00fbret\u00e9 nucl\u00e9aire (CCSN), des s\u00e9ances de perfectionnement professionnel et bien plus. Restez branch\u00e9s!<\/p>\n

Comme vous le savez peut-\u00eatre, j\u2019ai re\u00e7u une formation en sciences judiciaires, et pour r\u00e9diger ce message du pr\u00e9sident, je suis retourn\u00e9 \u00e0 mes racines. Il existe plusieurs liens communs entre les rayonnements et le judiciaire, comme l\u2019analyse nucl\u00e9o-l\u00e9gale, l\u2019analyse des isotopes radioactifs de mat\u00e9riaux squelettiques et la radiologie m\u00e9dico-l\u00e9gale (examens par rayonnements ionisants pour recueillir et analyser les preuves trouv\u00e9es dans les organes de patients d\u00e9c\u00e9d\u00e9s afin de d\u00e9terminer la cause de la blessure ou du d\u00e9c\u00e8s). Pour cette chronique cependant, je discuterai d\u2019analyse judiciaire, et en particulier de l\u2019analyse par activation neutronique (AAN).<\/p>\n

L\u2019AAN peut \u00eatre d\u00e9finie comme \u00ab un processus nucl\u00e9aire utilis\u00e9 pour d\u00e9terminer les concentrations d\u2019\u00e9l\u00e9ments dans une grande quantit\u00e9 de mat\u00e9riaux \u00bb.[1]<\/a> Elle repose sur l\u2019excitation de l\u2019\u00e9chantillon trait\u00e9 par des neutrons afin qu\u2019il \u00e9mette des rayons gamma. L\u2019\u00e9chantillon est donc bombard\u00e9 par des neutrons qui incitent les \u00e9l\u00e9ments \u00e0 former des isotopes radioactifs (figure\u00a01).<\/p>\n

\"NAA<\/p>\n

Figure 1 :<\/strong> Capture de neutrons par un noyau cible suivie de l\u2019\u00e9mission de rayons gamma.<\/span><\/em><\/p>\n

L\u2019avantage principal de l\u2019AAN est de fournir une m\u00e9thode non destructive pour identifier et quantifier les \u00e9l\u00e9ments traces. Une sensibilit\u00e9 de d\u00e9tection m\u00e9diane d\u2019un milliardi\u00e8me de gramme fait de l\u2019AAN une des m\u00e9thodes les plus pr\u00e9cises disponibles de nos jours pour la d\u00e9tection quantitative de plusieurs \u00e9l\u00e9ments.<\/p>\n

Toutefois, l\u2019inconv\u00e9nient majeur de la technique est son co\u00fbt et donc seuls quelques laboratoires criminels ont acc\u00e8s \u00e0 un r\u00e9acteur nucl\u00e9aire.<\/p>\n

En ce qui concerne l\u2019analyse judiciaire, l\u2019activation neutronique est utilis\u00e9e pour la caract\u00e9risation des \u00e9l\u00e9ments traces pr\u00e9sents dans les m\u00e9taux, les drogues, la peinture, le sol, les r\u00e9sidus de poudre noire et les cheveux. Par exemple, l\u2019AAN a \u00e9t\u00e9 utilis\u00e9e dans l\u2019enqu\u00eate sur le vol de fils t\u00e9l\u00e9graphiques en cuivre au Canada. Les enqu\u00eateurs ont employ\u00e9 l\u2019activation neutronique pour comparer quatre longueurs de fils de cuivre (A1, A2, A3, A4) trouv\u00e9s sur le lieu du vol \u00e0 la longueur d\u2019un fil de cuivre (B) saisi dans un site de ferraille et soup\u00e7onn\u00e9 d\u2019avoir \u00e9t\u00e9 vol\u00e9. Tous les fils \u00e9taient d\u00e9nud\u00e9s, monobrin, de m\u00eame aspect g\u00e9n\u00e9ral et d\u2019un diam\u00e8tre de 0,28\u00a0cm. \u00c0 la suite d\u2019exp\u00e9riences ant\u00e9rieures, les enqu\u00eateurs s\u2019attendaient \u00e0 des variations significatives dans les niveaux de concentration des \u00e9l\u00e9ments traces tels le s\u00e9l\u00e9nium, l\u2019or et l\u2019antimoine pour les fils provenant de diff\u00e9rentes sources. On a donc compar\u00e9 les \u00e9l\u00e9ments pr\u00e9sents dans les fils impliqu\u00e9s dans le vol.<\/p>\n

Apr\u00e8s avoir expos\u00e9 les fils aux neutrons d\u2019un r\u00e9acteur nucl\u00e9aire, l\u2019AAN a r\u00e9v\u00e9l\u00e9 une concordance bien en-de\u00e7a des marges de l\u2019erreur exp\u00e9rimentale entre les fils A1 et B (voir le tableau ci-dessous)[2]<\/a>, sugg\u00e9rant que les fils A1 et B avaient une origine commune.<\/p>\n

Tableau 1 :<\/strong> Concentrations des \u00e9l\u00e9ments traces (s\u00e9l\u00e9nium, or et antimoine) en parties par million.<\/span><\/em><\/p>\n\n\n\n\n\n\n\n\n\n
<\/td>\nS\u00e9l\u00e9nium<\/strong><\/td>\nOr<\/strong><\/td>\nAntimoine<\/strong><\/td>\n<\/tr>\n<\/thead>\n
Fils trouv\u00e9s sur le lieu du vol<\/strong><\/td>\nA1<\/td>\n2,4<\/td>\n0,047<\/td>\n0,16<\/td>\n<\/tr>\n
A2<\/td>\n3,5<\/td>\n0,064<\/td>\n0,27<\/td>\n<\/tr>\n
A3<\/td>\n2,6<\/td>\n0,050<\/td>\n0,20<\/td>\n<\/tr>\n
A4<\/td>\n1,9<\/td>\n0,034<\/td>\n0,21<\/td>\n<\/tr>\n
Fil suspect\u00e9 d\u2019avoir \u00e9t\u00e9 vol\u00e9<\/strong><\/td>\nB<\/td>\n2,3<\/td>\n0,042<\/td>\n0,15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Cette m\u00e9thode d\u2019analyse judiciaire pr\u00e9sente une des possibilit\u00e9s moins connues des multiples applications de la science nucl\u00e9aire au quotidien.<\/p>\n

\n

Notes:<\/h4>\n

[1]<\/a> Integrated Infrastructure Initiative for Neutron Scattering and Muon Spectroscopy, For chemical analysis: Neutron Activation Analysis<\/em> (https:\/\/nmi3.eu\/neutron-research\/techniques-for-\/chemical-analysis.html<\/a>).<\/p>\n

[2]<\/a> Chan, R. (1972). Identification of single stranded copper wires by neutron activation analysis. Journal of Forensic Sciences<\/em>,<\/em> 17<\/em>(1), pp. 93\u201396.<\/p>\n

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Comme vous le savez peut-\u00eatre, j\u2019ai re\u00e7u une formation en sciences judiciaires, et pour r\u00e9diger ce message du pr\u00e9sident, je suis retourn\u00e9 \u00e0 mes racines.<\/p>\n","protected":false},"author":69,"featured_media":2528,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[28],"tags":[],"class_list":["post-2583","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chroniques-regulieres-fr"],"yoast_head":"\nMessage du pr\u00e9sident, octobre 2020 - CRPA-ACRP Bulletin<\/title>\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.crpa-acrp-bulletin.ca\/fr\/2020\/10\/07\/message-du-president-octobre-2020\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Message du pr\u00e9sident, octobre 2020 - 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