X-Ray Certification Radiation Physics and Protection 2

Question 1

Which type of radiation has the greatest penetrating power?

Accepted Answer

Gamma rays

Answer

Alpha particles

Answer

Beta particles

Answer

Neutrons

Question 2

What is the half-value layer (HVL) of a material?

Accepted Answer

The thickness that reduces radiation intensity by half

Answer

The thickness that stops all radiation

Answer

The depth at which radiation becomes safe

Answer

The layer where scatter radiation originates

Question 3

In the photoelectric effect, what happens to the incident X-ray photon?

Accepted Answer

It is completely absorbed by an inner-shell electron

Answer

It is scattered at a lower energy

Answer

It passes through the atom unchanged

Answer

It splits into two lower-energy photons

Question 4

What unit is used to measure radiation absorbed dose in SI units?

Accepted Answer

Gray

Answer

Rem

Answer

Roentgen

Answer

Curie

Question 5

Which of the following best describes coherent (classical) scattering?

Accepted Answer

An incident photon interacts with the whole atom and is redirected without energy loss

Answer

An incident photon ejects a photoelectron from the atom

Answer

An incident photon transfers partial energy to a free electron

Answer

An incident photon converts to an electron-positron pair

Question 6

Which radiation protection principle states that exposure should be kept as low as reasonably achievable?

Accepted Answer

ALARA

Answer

NCRP

Answer

BERT

Answer

HVL

Question 7

What is the primary source of occupational radiation exposure for radiologic technologists?

Accepted Answer

Scatter radiation from the patient

Answer

Primary beam leakage

Answer

Natural background radiation

Answer

Radioactive contrast agents