CRA CRA Radiation Physics & Safety 1

Question 1

Which type of ionizing radiation has the GREATEST penetrating power and requires the most shielding?

Accepted Answer

Gamma rays

Answer

Gamma rays are high-energy electromagnetic radiation with very high penetrating power, requiring dense materials like lead for effective shielding.

Question 2

The ALARA principle in radiation safety stands for:

Accepted Answer

As Low As Reasonably Achievable

Answer

ALARA — As Low As Reasonably Achievable — is the guiding principle that radiation exposure should be minimized as much as practically possible.

Question 3

The annual occupational whole-body effective dose limit for radiation workers in the United States, as set by the NRC, is:

Accepted Answer

5 rem (50 mSv)

Answer

The NRC and NCRP set the annual occupational whole-body effective dose limit at 5 rem (50 mSv) for radiation workers.

Question 4

Which radiation monitoring device is worn by radiology staff to measure cumulative occupational radiation exposure?

Accepted Answer

Dosimeter badge (OSL or TLD)

Answer

Optically stimulated luminescence (OSL) and thermoluminescent dosimeters (TLD) worn as badges measure and record an individual's cumulative radiation dose.

Question 5

In radiographic imaging, the three cardinal principles of radiation protection are:

Accepted Answer

Time, distance, and shielding

Answer

Time (minimize exposure time), distance (maximize distance from source), and shielding (use protective barriers) are the three cardinal principles of radiation protection.

CRA - Certified Radiology Administrator Practice Test

CRA - Certified Radiology Administrator Practice Test

CRA CRA Radiation Physics & Safety 1