CRA CRA Radiation Physics & Safety 2

Question 1

Which regulatory body is responsible for overseeing radiation safety in medical facilities using radioactive materials in the United States?

Accepted Answer

NRC (Nuclear Regulatory Commission)

Answer

OSHA

Answer

EPA

Answer

FDA

Question 2

What is the purpose of collimation in diagnostic radiology?

Accepted Answer

To limit the X-ray beam to the area of clinical interest and reduce patient dose

Answer

To increase radiation output from the X-ray tube

Answer

To filter out high-energy photons from the beam

Answer

To reduce the heat generated in the X-ray tube anode

Question 3

Which type of radiation interaction with matter is most responsible for photoelectric effect in diagnostic radiology?

Accepted Answer

Low-energy photons interacting with inner-shell electrons

Answer

High-energy photons interacting with outer-shell electrons

Answer

Neutrons interacting with atomic nuclei

Answer

Alpha particles interacting with tissue

Question 4

A lead apron used for radiation protection in diagnostic radiology typically provides an attenuation equivalent of:

Accepted Answer

0.5 mm Pb

Answer

0.1 mm Pb

Answer

0.25 mm Pb

Answer

1.0 mm Pb

Question 5

Radiation-induced health effects that have a threshold dose below which no harm occurs and increase in severity with dose are called:

Accepted Answer

Deterministic (non-stochastic) effects

Answer

Stochastic effects

Answer

Genetic effects

Answer

Latent effects

Question 6

In a radiology department, which area classification requires the MOST stringent radiation shielding design?

Accepted Answer

Radiographic room housing the X-ray equipment

Answer

Waiting room adjacent to imaging suite

Answer

Control booth behind protective barrier

Answer

Staff break room one floor above imaging