CRA CRA Radiation Physics & Safety

Question 1

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

Accepted Answer

Gamma rays

Answer

Alpha particles

Answer

Beta particles

Answer

Neutrons

Question 2

The ALARA principle in radiation safety stands for:

Accepted Answer

As Low As Reasonably Achievable

Answer

All Levels Are Reasonably Adequate

Answer

All Limits Are Regulated and Approved

Answer

As Little As Reasonably Allowed

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

1 rem (10 mSv)

Answer

2 rem (20 mSv)

Answer

10 rem (100 mSv)

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

Geiger-Müller counter

Answer

Ionization chamber survey meter

Answer

Scintillation detector

Question 5

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

Accepted Answer

Time, distance, and shielding

Answer

Collimation, filtration, and shielding

Answer

Technique, positioning, and shielding

Answer

kVp, mAs, and distance

Question 6

The inverse square law states that radiation intensity is related to distance by which relationship?

Accepted Answer

Intensity decreases proportionally to the square of the distance

Answer

Intensity increases proportionally as distance increases

Answer

Intensity remains constant regardless of distance

Answer

Intensity doubles as distance doubles