X-Ray Certification Radiation Physics and Protection 2

Question 1

Which type of radiation has the greatest penetrating power?

Accepted Answer

Gamma rays

Answer

Gamma rays have the greatest penetrating power of common radiation types and can pass through dense materials.

Question 2

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

Accepted Answer

The thickness that reduces radiation intensity by half

Answer

HVL is the thickness of a specified material that reduces radiation intensity to 50% of its original value.

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

In the photoelectric effect, the photon is completely absorbed by an inner-shell electron, which is then ejected from the atom.

Question 4

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

Accepted Answer

Gray

Answer

The Gray (Gy) is the SI unit of absorbed dose, equal to 1 joule of energy deposited per kilogram of tissue.

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

Coherent scattering involves a low-energy photon interacting with an entire atom and being redirected without any energy loss.

X-Ray Certification Practice Test