{"id":5655,"date":"2024-02-05T16:29:38","date_gmt":"2024-02-05T22:29:38","guid":{"rendered":"https:\/\/www.crpa-acrp-bulletin.ca\/?p=5655"},"modified":"2024-02-29T09:54:12","modified_gmt":"2024-02-29T15:54:12","slug":"coin-du-specialiste-de-la-radioprotection-fevrier-2024","status":"publish","type":"post","link":"https:\/\/www.crpa-acrp-bulletin.ca\/fr\/2024\/02\/05\/coin-du-specialiste-de-la-radioprotection-fevrier-2024\/","title":{"rendered":"Coin du sp\u00e9cialiste de la radioprotection, f\u00e9vrier 2024"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5656 size-full\" 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;\">\u00c9tablir l\u2019efficacit\u00e9 de d\u00e9tection pour les mesures de la contamination de surface : Calculs de v\u00e9rification et des exemples<\/h1>\n<p><a href=\"#resume\"><input class=\"search-submit\" type=\"submit\" value=\"R\u00e9sum\u00e9\" \/><\/a><\/p>\n<div>\n<p class=\"clear\">\n<\/div>\n<p style=\"font-weight: 400;\">Welcome back to the Health Physics (HP) Corner! For years, this was a regular feature in the CRPA <em>Bulletin<\/em>. It drifted away in 2017, but we are very excited to see it resurrected by Jeff Sandeman.<\/p>\n<p style=\"font-weight: 400;\">The October issue of the Directorate of Nuclear Substance Regulation (DNSR) <em>Digest<\/em> asked, \u201cHave you properly calibrated your contamination monitoring equipment?\u201d A technical question like this seemed like the perfect opportunity for us to return to the Health Physics corner of the CRPA <em>Bulletin<\/em>.<\/p>\n<p style=\"font-weight: 400;\">In this first installment, Jeff carries on from the Canadian Nuclear Safety Commission (CNSC) licensee outreach presentation on contamination monitoring (Establishing Detection Efficiency for Surface contamination Measurements) and runs through some verification calculations and examples. If you haven\u2019t seen the presentation yet, take an opportunity to watch it (available online in <a href=\"https:\/\/www.youtube.com\/watch?v=4Icza2gpj-g\">English<\/a> and <a href=\"https:\/\/www.youtube.com\/watch?v=e7yo1Y28iYE\">French<\/a>) or look at the PowerPoint slides (<a href=\"https:\/\/crpa-acrp.ca\/home\/wp-content\/uploads\/2024\/01\/Presentation-DNSR-Contamination-Monitoring-Licensee-Webinar-12-July-2023.pdf\">English<\/a> and <a href=\"https:\/\/crpa-acrp.ca\/home\/wp-content\/uploads\/2024\/01\/Presentation-Webinaire-sur-la-surveillance-de-contamination-pour-titulaires-de-permis-de-la-DRSN-12-juillet-2023.pdf\">French<\/a>) before you dive into this HP Corner!<\/p>\n<p>&nbsp;<\/p>\n<h2>PART 1<\/h2>\n<p>Let\u2019s take a look at the second method presented for establishing detection efficiency; specifically, the example where Co-60 is used as a surrogate to calculate the GM pancake efficiency for Zn-65. The extrapolated efficiency for Zn-65 is given as 0.33%.<\/p>\n<p>Does this make sense and why?<\/p>\n<p style=\"font-weight: 400;\"><strong>        <div class=\"rmwr-wrapper\"\r\n             data-id=\"rmwr-p5655-1\"\r\n                          data-key=\"p5655-1\"\r\n                          data-post=\"5655\"\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-p5655-1\"\r\n                data-open-text=\"Show Answer\"\r\n                data-close-text=\"Hide Answer\"\r\n                                aria-expanded=\"false\"\r\n                aria-controls=\"readrmwr-p5655-1\"\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-p5655-1\"\r\n                aria-hidden=\"true\"\r\n                style=\"display: none;\"\r\n            >\r\n                                    <\/strong><\/p>\n<p style=\"font-weight: 400\"><strong>PART 1 Answer<\/strong><\/p>\n<p style=\"font-weight: 400\">YES \u2013 the extrapolated efficiency makes sense.<\/p>\n<p style=\"font-weight: 400\">The active area of a typical GM pancake is 15 cm<sup>2<\/sup>, which gives it a radius of 2.19 cm.<\/p>\n<p style=\"font-weight: 400\">If we assume that the area of the source &lt;&lt; than the detector area, and that the detector window is 1 cm from the source, we can calculate the geometry factor as follows.<\/p>\n<ul>\n<li>Angle of cone:<\/li>\n<\/ul>\n<p><img \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5626\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-1-300x68.jpg\" alt=\"\" width=\"175\" height=\"40\" \/><\/p>\n<ul>\n<li>Solid angle:<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 2\u03c0(1-cos (66\u00b0)) = 3.73 steradians<\/p>\n<ul>\n<li>Geometry factor is 3.73\/4\u03c0= 0.3<\/li>\n<\/ul>\n<p style=\"font-weight: 400\"><strong>Gamma efficiency:<\/strong><\/p>\n<p>A GM pancake is gas filled and thus expected to have a very low efficiency (\u2248 0.5%) for a high energy gamma. Applying this factor, and knowing that the high energy gamma is emitted about 50% of the time, the gamma efficiency is calculated as follows:<\/p>\n<p style=\"font-weight: 400\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 0.5% (efficiency) x 0.3 (geometry factor) x 0.5 \u1eff\/decay = 0.075%<\/p>\n<p style=\"font-weight: 400\"><strong>Beta efficiency:<\/strong><\/p>\n<p style=\"font-weight: 400\">A GM pancake is expected to have essentially 100% efficiency for any beta that gets through the window. From the presentation slide (below) showing the beta spectra and cutoff, we can estimate that at 330 keV, roughly 50% of the betas, will get through window.<\/p>\n<p style=\"font-weight: 400\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 100% (efficiency) x 0.014 \u03b2+\/decay x 0.5 (window losses) x 0.3 (geometry factor) = 0.21%<\/p>\n<p style=\"font-weight: 400\">The total efficiency is therefore 0.21% + 0.075% = 0.29%. This is on the same order of magnitude and compares well with the extrapolated efficiency of 0.33%.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5660\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr-1024x566.png\" alt=\"\" width=\"800\" height=\"442\" srcset=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr-1024x566.png 1024w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr-300x166.png 300w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr-768x424.png 768w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr-1536x848.png 1536w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr-720x398.png 720w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr-520x287.png 520w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr-320x177.png 320w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-slide-from-CNSC-Presentation-Fr.png 1731w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n                            <\/div>\r\n                    <\/div>\r\n        \n<p>&nbsp;<\/p>\n<h2 style=\"font-weight: 400;\"><strong>PART 2<\/strong><\/h2>\n<p style=\"font-weight: 400;\">If you wipe a lab surface area that is 100 cm<sup>2<\/sup>\u00a0and count the wipe for 10 minutes at a distance of 1 cm, and the background count rate is 30 CPM, is the minimum detectable activity (MDA) low enough to satisfy CNSC contamination detection requirements for Zn-65 in a controlled area?<\/p>\n<p style=\"font-weight: 400;\"><strong>        <div class=\"rmwr-wrapper\"\r\n             data-id=\"rmwr-p5655-2\"\r\n                          data-key=\"p5655-2\"\r\n                          data-post=\"5655\"\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-p5655-2\"\r\n                data-open-text=\"Show Answer\"\r\n                data-close-text=\"Hide Answer\"\r\n                                aria-expanded=\"false\"\r\n                aria-controls=\"readrmwr-p5655-2\"\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-p5655-2\"\r\n                aria-hidden=\"true\"\r\n                style=\"display: none;\"\r\n            >\r\n                                    <\/strong><\/p>\n<p style=\"font-weight: 400\"><strong>PART 2 Answer<\/strong><\/p>\n<p style=\"font-weight: 400\">NO \u2013 the MDA is not low enough to satisfy CNSC contamination detection requirements.<\/p>\n<p style=\"font-weight: 400\">The MDA, in units of Bq\/cm<sup>2<\/sup>, is calculated from the following equation:<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <img \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5628\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-2.jpg\" alt=\"\" width=\"183\" height=\"70\" srcset=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-2.jpg 629w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-2-300x115.jpg 300w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-2-520x199.jpg 520w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-2-320x123.jpg 320w\" sizes=\"auto, (max-width: 183px) 100vw, 183px\" \/><\/p>\n<p style=\"font-weight: 400\">In this example:<\/p>\n<ul>\n<li><em>NB<\/em> = 30 CPM<\/li>\n<li><em>T<\/em> = 600<\/li>\n<li><em>E<\/em> = 0.0033<\/li>\n<li><em>A<\/em> = 100<\/li>\n<li><em>F<\/em> = 0.1 (default value given in the presentation)<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">The calculated MDA is 4.2 Bq\/cm<sup>2<\/sup>. This exceeds the contamination limit, which for Zn-65 (a class C radionuclide) is 3 Bq\/cm<sup>2<\/sup> for controlled areas.<\/p>\n                            <\/div>\r\n                    <\/div>\r\n        \n<p>&nbsp;<\/p>\n<h2 style=\"font-weight: 400;\"><strong>PART 3<\/strong><\/h2>\n<p style=\"font-weight: 400;\">Alternatively, could the instrument be used for direct measurement of Zn-65 surface contamination, again at a distance of 1 cm and the same count time of 10 minutes over each area monitored?<\/p>\n<p style=\"font-weight: 400;\"><strong>        <div class=\"rmwr-wrapper\"\r\n             data-id=\"rmwr-p5655-3\"\r\n                          data-key=\"p5655-3\"\r\n                          data-post=\"5655\"\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-p5655-3\"\r\n                data-open-text=\"Show Answer\"\r\n                data-close-text=\"Hide Answer\"\r\n                                aria-expanded=\"false\"\r\n                aria-controls=\"readrmwr-p5655-3\"\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-p5655-3\"\r\n                aria-hidden=\"true\"\r\n                style=\"display: none;\"\r\n            >\r\n                                    <\/strong><\/p>\n<p><strong>PART 3 Answer<\/strong><\/p>\n<p style=\"font-weight: 400\">NO \u2013 the MDA is not low enough to be used for direct measurement.<\/p>\n<p style=\"font-weight: 400\">For direct measurements, we can use the same formula as above with two changes:<\/p>\n<ul>\n<li>There is no value for <em>F<\/em>. Since we are not taking a swipe, there is no swipe efficiency to be considered. (Alternatively, you can consider that there is in fact full efficiency in this case, for which the value of <em>F<\/em> would be 1. The end result is the same).<\/li>\n<li>The area for the calculation, <em>A<\/em>, is now only 15 cm<sup>2<\/sup>; for a direct check, we use the area of the detector.<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">Running through the calculation with these values, we get an MDA of 2.8 Bq\/cm<sup>2<\/sup>, which is below the limit of 3 Bq\/cm<sup>2<\/sup>.<\/p>\n<p style=\"font-weight: 400\"><strong>BUT we\u2019re not done \u2014 don\u2019t forget to include the uncertainty!<\/strong><\/p>\n<p style=\"font-weight: 400\">The 2\u03c3 uncertainty is calculated using the following formula:<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <img \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5630\" src=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-3.jpg\" alt=\"\" width=\"211\" height=\"70\" srcset=\"https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-3.jpg 741w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-3-300x100.jpg 300w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-3-720x239.jpg 720w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-3-520x173.jpg 520w, https:\/\/www.crpa-acrp-bulletin.ca\/wp-content\/uploads\/2024\/01\/HP-Corner-2024-1-3-320x106.jpg 320w\" sizes=\"auto, (max-width: 211px) 100vw, 211px\" \/><\/p>\n<p style=\"font-weight: 400\">Again, for this example<\/p>\n<ul>\n<li><em>T<\/em> = 600<\/li>\n<li><em>E<\/em> = 0.0033<\/li>\n<li><em>A<\/em> = 15<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">But what is <em>N<\/em>?<\/p>\n<ul>\n<li>At 2.8 Bq\/cm<sup>2<\/sup>, the total contamination over a 15 cm<sup>2 <\/sup>area is 42 Bq.<\/li>\n<li>We already know that the efficiency is 0.033 at 1 cm, so the measured count rate, <em>N<\/em>, should be:<br \/>\nBq x 0.0033 = 0.14 cps or 8.4 CPM above background<\/li>\n<\/ul>\n<p style=\"font-weight: 400\">The 2\u03c3 uncertainty calculated from the formula above is then 1.3 Bq\/cm<sup>2<\/sup>.<\/p>\n<p style=\"font-weight: 400\">Therefore, the MDA plus the 2\u01a1 uncertainty (the upper bound) is 4.1 Bq\/cm<sup>2<\/sup>, which is greater than the contamination limit of 3 Bq\/cm<sup>2<\/sup>.<\/p>\n<p style=\"font-weight: 400\">(Note: Even if this was below the limit, a 10 minute dwell time for a direct measurement is not practical)<\/p>\n                            <\/div>\r\n                    <\/div>\r\n        \n<p>&nbsp;<\/p>\n<div id=\"resume\" style=\"padding: 8px 5px 5px 5px; background-color: #eeeeee; border: #dddddd 2px solid;\">\n<h2>R\u00e9sum\u00e9<\/h2>\n<div>\n<p style=\"font-weight: 400;\">Pendant des ann\u00e9es, la rubrique Coin du sp\u00e9cialiste de la radioprotection paraissait de fa\u00e7on r\u00e9guli\u00e8re dans le <em>Bulletin<\/em> de l\u2019ACRP. Elle a \u00e9t\u00e9 retir\u00e9e en 2017, mais nous sommes heureux que Jeff Sandeman la ram\u00e8ne!<\/p>\n<p><span style=\"font-weight: 400;\">Le num\u00e9ro d\u2019octobre\u00a02023 du bulletin d\u2019information de la Direction de la r\u00e9glementation des substances nucl\u00e9aires (DRSN) soulevait la question\u00a0: \u00ab\u00a0Avez-vous correctement calibr\u00e9 votre \u00e9quipement de surveillance de la contamination?\u00a0\u00bb Une telle question technique semblait l\u2019occasion parfaite pour relancer cette rubrique. Jeff esp\u00e8re que les questions qu\u2019il propose sont si diaboliquement distrayantes qu\u2019elles vous rendront fou, vous emp\u00eacheront de dormir, feront en sorte que vous allez vous arracher les cheveux sur la t\u00eate et, en g\u00e9n\u00e9ral, vous d\u00e9stabiliser. Il dit que c\u2019est, selon lui, la meilleure fa\u00e7on d\u2019apprendre!<\/span><\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<div><\/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-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><\/div>\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","protected":false},"excerpt":{"rendered":"<p>\u00c9tablir l\u2019efficacit\u00e9 de d\u00e9tection pour les mesures de la contamination de surface : Calculs de v\u00e9rification et des exemples Welcome back to the Health Physics (HP) Corner! For years, this was a regular feature&#46;&#46;&#46;<\/p>\n","protected":false},"author":128,"featured_media":5658,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[28],"tags":[],"class_list":["post-5655","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, f\u00e9vrier 2024 - CRPA-ACRP Bulletin<\/title>\n<meta name=\"description\" content=\"Calculs de v\u00e9rification et exemples bas\u00e9s sur une pr\u00e9sentation de la Commission canadienne de s\u00fbret\u00e9 nucl\u00e9aire (CCSN) destin\u00e9e aux titulaires de permis au sujet de la surveillance de la contamination.\" \/>\n<meta name=\"robots\" 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