{"id":1046,"date":"2018-09-08T19:44:49","date_gmt":"2018-09-09T01:44:49","guid":{"rendered":"https:\/\/www.crpa-acrp-bulletin.ca\/?p=1046"},"modified":"2020-02-18T20:21:12","modified_gmt":"2020-02-19T02:21:12","slug":"crpar-prep-september-2018-preparation-a-la-designation-aacrp-septembre-2018","status":"publish","type":"post","link":"https:\/\/www.crpa-acrp-bulletin.ca\/fr\/2018\/09\/08\/crpar-prep-september-2018-preparation-a-la-designation-aacrp-septembre-2018\/","title":{"rendered":"CRPA(R) Prep, September 2018 \/ Pr\u00e9paration \u00e0 la d\u00e9signation (A)ACRP, septembre 2018"},"content":{"rendered":"<div class='content-column one_half'><div style=\"padding-right:10px;\"><p>In the last issue<img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-994\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/CRPAR-icon_cropped-233x300.png\" alt=\"\" width=\"150\" height=\"193\" srcset=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/CRPAR-icon_cropped-233x300.png 233w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/CRPAR-icon_cropped-768x987.png 768w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/CRPAR-icon_cropped-797x1024.png 797w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/CRPAR-icon_cropped-520x668.png 520w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/CRPAR-icon_cropped.png 1868w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/> of the <em>Bulletin<\/em>, we debuted the \u201cCRPA(R) Prep\u201d column. In each issue, we will propose a question or two similar to the questions on the\u00a0<a href=\"http:\/\/crpa-acrp.org\/home\/?page_id=5283\" target=\"_blank\" rel=\"noopener noreferrer\">CRPA(R) exam<\/a>. The answers will be published in the next issue, along with new questions.<\/p>\n<p>The intention is to give people a sense of how the questions are written for the CRPA(R) exam and their level of difficulty. Hopefully, we can encourage more members to take the exam and become Registered Radiation Safety Professionals (RRSPs).<\/p>\n<p>Also, if you already have your CRPA(R) designation, we invite you to\u00a0<a href=\"mailto:cmalcol@mcmaster.ca\">submit questions<\/a>\u00a0to earn points for your registration maintenance!<\/p>\n<h1>Question from the last issue:<\/h1>\n<p>Here is the question from the <a href=\"https:\/\/www.crpa-acrp-bulletin.ca\/2018\/07\/18\/crpar-prep-preparation-a-la-designation-aacrp\/\" target=\"_blank\" rel=\"noopener noreferrer\">last issue<\/a>:<\/p>\n<p style=\"padding-left: 30px;\">Calculate the effective half-life for a radionuclide with a physical half-life of 16 hours and a biological decay constant of 0.0068 per minute.<\/p>\n<p><strong>Proposed solution:<\/strong><\/p>\n<p>So let\u2019s take a look at a proposed solution. There are lots of ways to tackle this problem. It\u2019s pretty straightforward, but there are some small areas where people might get tripped up.<\/p>\n<p>First, always make sure your time units are the same. It doesn\u2019t matter which unit you choose, but they have to match\u2014I converted everything to minutes.<\/p>\n<p>Next, let\u2019s identify some relevant questions to consider. The two most common are:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1062\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/09\/image001-1.png\" alt=\"\" width=\"88\" height=\"39\" \/><\/p>\n<p>Where<\/p>\n<ul>\n<li>\u03bb<sub>e<\/sub> is the effective decay constant<\/li>\n<li>\u03bb<sub>p<\/sub> is the physical (or radiological) decay constant<\/li>\n<li>\u03bb<sub>b<\/sub> is the biological decay constant<\/li>\n<\/ul>\n<p>or:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1050\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/09\/image003.png\" alt=\"\" width=\"136\" height=\"60\" \/><\/p>\n<p>Where<\/p>\n<ul>\n<li>t<sub>1\/2e<\/sub> is the effective decay constant<\/li>\n<li>t<sub>1\/2p<\/sub> is the physical (or radiological) decay constant<\/li>\n<li>t<sub>1\/2b<\/sub> is the biological decay constant<\/li>\n<\/ul>\n<p>You need to use either all decay constants or all half-lives. I chose to use decay constants to avoid the pesky denominators. You find the physical decay constant by using the physical half-life with the following well-known relationship:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1051\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/09\/image005.png\" alt=\"\" width=\"72\" height=\"61\" \/><\/p>\n<p>I used 960 minutes (16 h) and got 0.00072 min<sup>\u22121<\/sup> for the physical decay constant.<\/p>\n<p>If you add this to the biological decay constant 0.0068 min<sup>\u22121<\/sup>, you get 0.0075 min<sup>\u22121 <\/sup>for the effective decay constant.<\/p>\n<p>Finally, to get an effective half-life of 92 mins you use<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1052\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/09\/image007.png\" alt=\"\" width=\"88\" height=\"58\" \/><\/p>\n<p>Sometimes, the tricky exam coordinator will give you answers in different units, so you may have to do some unit conversion to find the correct multiple-choice answer.<\/p>\n<p>SEE! That wasn\u2019t so bad\u2014you can totally nail this exam!<\/p>\n<h1>New question:<\/h1>\n<p>Here\u2019s this issue\u2019s question:<\/p>\n<p style=\"padding-left: 30px;\">One tenth value layer (TVL) is equal to approximately how many half value layers (HVLs)?<\/p>\n<p>Stay tuned for the next issue to check your answer and get another question!<\/p><\/div><\/div>\n<div class='content-column one_half last_column'><div style=\"padding-left:10px;\"><div style=\"padding: 0 0 0 20px; border-left: #dddddd 1px solid;\">\n<p>Dans le dernier num\u00e9ro du <em>Bulletin<\/em>, nous lancions la rubrique \u00ab Pr\u00e9paration \u00e0 la d\u00e9signation (A)ACRP\u00a0\u00bb. L\u2019id\u00e9e est de proposer dans chaque num\u00e9ro une ou deux questions similaires \u00e0 celles de l\u2019<a href=\"http:\/\/crpa-acrp.org\/home\/?page_id=5749&amp;lang=fr\" target=\"_blank\" rel=\"noopener noreferrer\">examen (A)ACRP<\/a>. Les r\u00e9ponses seront publi\u00e9es dans le num\u00e9ro subs\u00e9quent, accompagn\u00e9es de nouvelles questions.<\/p>\n<p>L\u2019objectif est de donner aux candidats potentiels une id\u00e9e des questions de l\u2019examen (A)ACRP et du niveau de difficult\u00e9. Avec un peu de chance, nous encouragerons plus de membres \u00e0 faire l\u2019examen et \u00e0 devenir professionnel de la radioprotection agr\u00e9\u00e9 (PRPA).<\/p>\n<p>En outre, nous vous invitons \u00e0 <a href=\"mailto:cmalcol@mcmaster.ca\">soumettre des questions<\/a> afin d\u2019obtenir des points pour le maintien de votre d\u00e9signation (A)ACRP si vous la d\u00e9tenez d\u00e9j\u00e0 !<\/p>\n<h1>Question du dernier num\u00e9ro\u00a0:<\/h1>\n<p>Voici la question du <a href=\"https:\/\/www.crpa-acrp-bulletin.ca\/2018\/07\/18\/crpar-prep-preparation-a-la-designation-aacrp\/\" target=\"_blank\" rel=\"noopener noreferrer\">dernier num\u00e9ro<\/a>\u00a0:<\/p>\n<p style=\"padding-left: 30px;\">Calculez la demi-vie effective d\u2019un radionucl\u00e9ide ayant une demi-vie physique de 16 heures et une constante de d\u00e9croissance biologique de 0,0068 par minute.<\/p>\n<p><strong>Solution propos\u00e9e\u00a0:<\/strong><\/p>\n<p>Jetons un coup d\u2019\u0153il \u00e0 la solution propos\u00e9e. Il y a plusieurs fa\u00e7ons de traiter le probl\u00e8me. C\u2019est plut\u00f4t simple mais certaines personnes pourraient tomber dans quelques pi\u00e8ges.<\/p>\n<p>Tout d\u2019abord, vous devez vous assurer de toujours avoir les m\u00eames unit\u00e9s de temps. Peu importe quelles unit\u00e9s vous choisissez, elles doivent correspondre\u00a0; dans ce cas-ci, j\u2019ai tout converti en minutes.<\/p>\n<p>Il nous faut ensuite relever les points pertinents \u00e0 prendre en consid\u00e9ration. Les deux plus communs sont les suivants\u00a0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1062\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/09\/image001-1.png\" alt=\"\" width=\"88\" height=\"39\" \/><\/p>\n<p>o\u00f9<\/p>\n<ul>\n<li>\u03bb<sub>e<\/sub> est la constante de d\u00e9gradation effective<\/li>\n<li>\u03bb<sub>p<\/sub> est la constante de d\u00e9sint\u00e9gration physique (ou radiologique)<\/li>\n<li>\u03bb<sub>b<\/sub> est la constante de biod\u00e9gradation<\/li>\n<\/ul>\n<p>ou encore :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1050\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/09\/image003.png\" alt=\"\" width=\"136\" height=\"60\" \/><\/p>\n<p>o\u00f9<\/p>\n<ul>\n<li>t<sub>1\/2e<\/sub> est la constante de d\u00e9gradation effective<\/li>\n<li>t<sub>1\/2p<\/sub> est la constante de d\u00e9sint\u00e9gration physique (ou radiologique)<\/li>\n<li>t<sub>1\/2b<\/sub> est la constante de biod\u00e9gradation<\/li>\n<\/ul>\n<p>Il vous faut utiliser soit toutes les constantes de d\u00e9gradation, soit toutes les demi-vies. J\u2019ai choisi d\u2019utiliser les constantes de d\u00e9gradation pour \u00e9viter les fichus d\u00e9nominateurs. On trouve la constante de d\u00e9sint\u00e9gration physique en utilisant la demi-vie physique par la formule bien connue suivante\u00a0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1051\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/09\/image005.png\" alt=\"\" width=\"72\" height=\"61\" \/><\/p>\n<p>J\u2019ai pris 960 minutes (16 h) et obtenu 0,00072 min<sup>\u22121<\/sup> comme constante de d\u00e9sint\u00e9gration physique.<\/p>\n<p>Si on ajoute ce r\u00e9sultat \u00e0 la constante de biod\u00e9gradation 0,0068 min<sup>\u22121<\/sup>, on obtient 0,0075 min<sup>\u22121 <\/sup>pour la constante de d\u00e9gradation effective.<\/p>\n<p>Enfin, pour obtenir une demi-vie effective de 92 minutes, il faut utiliser la formule<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1052\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/09\/image007.png\" alt=\"\" width=\"88\" height=\"58\" \/><\/p>\n<p>Parfois, l\u2019astucieux coordonnateur d\u2019examen donne une r\u00e9ponse dans des unit\u00e9s diff\u00e9rentes ; il se peut donc que vous deviez convertir certaines unit\u00e9s pour trouver la r\u00e9ponse \u00e0 choix multiple correcte.<\/p>\n<p>VOUS VOYEZ ? Ce n\u2019\u00e9tait pas si mal ! Vous pouvez tout \u00e0 fait r\u00e9ussir cet examen\u00a0!<\/p>\n<h1>Nouvelle question\u00a0:<\/h1>\n<p>Voici la question du pr\u00e9sent num\u00e9ro\u00a0:<\/p>\n<p style=\"padding-left: 30px;\">Une couche d\u2019att\u00e9nuation au dixi\u00e8me (TVL) est \u00e9gale \u00e0 environ combien de couches de demi-att\u00e9nuation (HVL)\u00a0?<\/p>\n<p>Restez \u00e0 l\u2019aff\u00fbt du prochain num\u00e9ro pour conna\u00eetre la r\u00e9ponse et lire la prochaine question !<\/p>\n<\/div><\/div><\/div><div class='clear_column'><\/div>\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-991\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/Chris-Malcolmson_cropped.jpg\" alt=\"\" width=\"125\" height=\"125\" srcset=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/Chris-Malcolmson_cropped.jpg 165w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/Chris-Malcolmson_cropped-150x150.jpg 150w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/Chris-Malcolmson_cropped-160x160.jpg 160w\" sizes=\"auto, (max-width: 125px) 100vw, 125px\" \/>Christopher Malcolmson<\/h2>\n<p>Christopher Malcolmson has been a health physicist at McMaster University since 2005.\u00a0He received a BSc from McMaster in 2004 and an MSc in 2011. He completed his CRPA(R) in 2009, American Board of Health Physics certification in 2012, and National Registry of Radiation Protection Technologists exam in 2016.\u00a0Malcolmson is currently a member of the CRPA board of directors (director of professional development) and the Registration Subcommittee exam coordinator. He is also a member of the International Radiation Protection Association\u2019s Commission on Publications.<\/p>\n<p>Christopher Malcolmson est sp\u00e9cialiste en radioprotection \u00e0 l\u2019Universit\u00e9 McMaster depuis 2005. Il a obtenu un baccalaur\u00e9at en sciences de cette m\u00eame universit\u00e9 en 2004, suivi d\u2019une ma\u00eetrise en 2011. Il a obtenu sa certification (A)ACRP en 2009, celle de l\u2019American Board of Health Physics (conseil am\u00e9ricain des sp\u00e9cialistes en radioprotection) en 2012, et a termin\u00e9 l\u2019examen de la National Registry of Radiation Protection Technologists (Registre national des technologues en radioprotection) en 2016. Malcolmson est pr\u00e9sentement membre du conseil d\u2019administration de l\u2019ACRP (directeur du perfectionnement professionnel) et coordonnateur de l\u2019examen au sous-comit\u00e9 des inscriptions. Il est \u00e9galement membre de la commission des publications de l\u2019Association internationale pour la protection contre les radiations.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>In the last issue of the Bulletin, we debuted the \u201cCRPA(R) Prep\u201d column. In each issue, we will propose a question or two similar to the questions on the\u00a0CRPA(R) exam.  \/ Dans le dernier num\u00e9ro du Bulletin, nous lancions la rubrique \u00ab Pr\u00e9paration \u00e0 la d\u00e9signation (A)ACRP\u00a0\u00bb. L\u2019id\u00e9e est de proposer dans chaque num\u00e9ro une ou deux questions similaires \u00e0 celles de l\u2019examen (A)ACRP.<\/p>\n","protected":false},"author":31,"featured_media":995,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[5,4],"tags":[],"class_list":["post-1046","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chroniques-regulieres","category-regular-columns"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CRPA(R) Prep, September 2018 \/ Pr\u00e9paration \u00e0 la d\u00e9signation (A)ACRP, septembre 2018 - 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\/2018\/09\/08\/crpar-prep-september-2018-preparation-a-la-designation-aacrp-septembre-2018\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CRPA(R) Prep, September 2018 \/ Pr\u00e9paration \u00e0 la d\u00e9signation (A)ACRP, septembre 2018 - CRPA-ACRP Bulletin\" \/>\n<meta property=\"og:description\" content=\"In the last issue of the Bulletin, we debuted the \u201cCRPA(R) Prep\u201d column. In each issue, we will propose a question or two similar to the questions on the\u00a0CRPA(R) exam. \/ Dans le dernier num\u00e9ro du Bulletin, nous lancions la rubrique \u00ab Pr\u00e9paration \u00e0 la d\u00e9signation (A)ACRP\u00a0\u00bb. L\u2019id\u00e9e est de proposer dans chaque num\u00e9ro une ou deux questions similaires \u00e0 celles de l\u2019examen (A)ACRP.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.crpa-acrp-bulletin.ca\/fr\/2018\/09\/08\/crpar-prep-september-2018-preparation-a-la-designation-aacrp-septembre-2018\/\" \/>\n<meta property=\"og:site_name\" content=\"CRPA-ACRP Bulletin\" \/>\n<meta property=\"article:published_time\" content=\"2018-09-09T01:44:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-02-19T02:21:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2018\/07\/CRPAR-icon-ftr.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Chris Malcolmson, Health Physicist, McMaster University, Former CRPA Director of Professional Development \/ Sp\u00e9cialiste en radioprotection, Universit\u00e9 McMaster, Ancien directeur du perfectionnement professionnel de l\u2019ACRP\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Chris Malcolmson, Health Physicist, McMaster University, Former CRPA Director of Professional Development \/ Sp\u00e9cialiste en radioprotection, Universit\u00e9 McMaster, Ancien directeur du perfectionnement professionnel de l\u2019ACRP\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" 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2018\",\"datePublished\":\"2018-09-09T01:44:49+00:00\",\"dateModified\":\"2020-02-19T02:21:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.crpa-acrp-bulletin.ca\\\/fr\\\/2018\\\/09\\\/08\\\/crpar-prep-september-2018-preparation-a-la-designation-aacrp-septembre-2018\\\/\"},\"wordCount\":1166,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.crpa-acrp-bulletin.ca\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.crpa-acrp-bulletin.ca\\\/fr\\\/2018\\\/09\\\/08\\\/crpar-prep-september-2018-preparation-a-la-designation-aacrp-septembre-2018\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.crpa-acrp-bulletin.ca\\\/wp-content\\\/uploads\\\/2018\\\/07\\\/CRPAR-icon-ftr.png\",\"articleSection\":[\"Chroniques r\u00e9guli\u00e8res\",\"Regular 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