CAMRT Radiation Protection and Safety Questions and Answers 2

Question 1

According to CNSC regulations, what is the annual effective dose limit for radiation workers?

Accepted Answer

50 mSv

Answer

The annual limit is 50 mSv with a 5-year cumulative limit of 100 mSv.

Question 2

What is the inverse square law in radiation protection?

Accepted Answer

Intensity decreases with the square of distance; doubling distance reduces exposure to one-quarter

Answer

Doubling the distance reduces exposure to 25%.

Question 3

A dosimeter was left on a sunlit windowsill over the weekend. What should the technologist do?

Accepted Answer

Report to the RSO, request replacement, note the incident for dose records

Answer

The incident must be reported so dose records can be annotated and a replacement issued.

Question 4

What shielding material is most common for diagnostic X-ray protection?

Accepted Answer

Lead, due to its high atomic number and density

Answer

Lead (Z=82) provides strong photoelectric absorption of diagnostic-energy photons.

Question 5

What is the purpose of the 10-day and 28-day rules for female patients?

Accepted Answer

Guide timing of non-urgent pelvic imaging to minimize irradiating an early pregnancy

Answer

These rules guide scheduling when pregnancy is least likely.

CAMRT - Canadian Association of Medical Radiation Technologists Practice Test