CRPA(R) Prep, November 2019 / Préparation à la désignation (A)ACRP, novembre 2019
In this section of the Bulletin, we introduce a question or two similar to the questions on the CRPA(R) exam. In the next issue, we will provide the solution. The intention is to give people an idea of the types of questions we use on the CRPA(R) exam and perhaps convince more members to challenge the exam.
The CRPA(R) designation is the highest level of competency recognized by CRPA at the Canadian level. To find out more, visit the CRPA website.
If you already have your CRPA(R) designation, we invite you to submit questions to earn points for your registration maintenance!
Question from the last issue:
What is not an exemption under the regulations?
a. A Canadian Nuclear Safety Commission inspector possessing a cesium-137 check source
b. A company shipping a replacement source for an industrial radiographer
c. An individual possessing less than an exemption quantity of iodine-125
d. Naturally occurring radioactive material not used in development of nuclear power
Unlike the question from the last issue, this is purely a knowledge-based question. No calculation is required. Either you know it or you don’t. So, if you don’t know it you’re totally in trouble, right? Not at all!
The exam committee is a reasonable bunch—they don’t expect you to memorize every last detail in all the regulations. You’re actually given a copy of relevant regulations. So, if you get a question that focuses on regulations, you can be fairly confident the answer will be sitting in front of you somewhere.
There is a small catch, however. The “relevant regulations” contain a lot of material. You don’t want to be wasting time reading an entire binder of regulations to find the right answer. Our advice would be to study the regulations in advance to know where to find certain information.
In this case the correct answer can quickly be found by process of elimination, if you know where to look. In the General Nuclear Safety and Control Regulations, you can find answers a. and d. in Sections 9 and 10 under the apt heading “Exemptions.” Answer c. can be found in the Nuclear Substances and Radiation Devices Regulations under Section 5, “General Exempted Activities.”
That leaves answer b. as the correct answer!
If you had to sift through all the regulations with no real idea where to start, finding the answer to this question would take valuable test time. So, review the regulations in advance and have a general idea where information can be found.
The question for next time:
Let’s go back to a calculation.
A Cs-137 source has a current activity of 20.76 kBq. A total number of 579,605 counts are measured over a five-minute counting period. If the background count rate is 88.7 cpm, what is the detector efficiency for this counter?