GXMO Radiation Physics and Safety 2

Question 1

Which unit is used to measure the absorbed dose of radiation in tissue?

Accepted Answer

Gray

Answer

Roentgen

Answer

Sievert

Answer

Becquerel

Question 2

What is the term for radiation that can remove electrons from atoms it interacts with?

Accepted Answer

Ionizing radiation

Answer

Non-ionizing radiation

Answer

Thermal radiation

Answer

Background radiation

Question 3

The half-value layer (HVL) of a material is defined as the thickness that reduces beam intensity by what fraction?

Accepted Answer

One-half

Answer

One-quarter

Answer

One-third

Answer

Two-thirds

Question 4

What type of interaction causes an x-ray photon to be completely absorbed while ejecting an inner-shell electron from an atom?

Accepted Answer

Photoelectric effect

Answer

Compton scatter

Answer

Pair production

Answer

Coherent scatter

Question 5

Which of the following best describes the ALARA principle?

Accepted Answer

As Low As Reasonably Achievable

Answer

Always Limit All Radiation Annually

Answer

Avoid Limiting Allowed Radiation Areas

Answer

As Large As Radiation Allows

Question 6

A patient's gonads should be shielded when the gonads are within what distance of the primary x-ray field?

Accepted Answer

5 cm

Answer

1 cm

Answer

3 cm

Answer

10 cm

Question 7

What is the primary purpose of added filtration in an x-ray beam?

Accepted Answer

Remove low-energy photons that cannot penetrate to the image receptor

Answer

Increase patient dose

Answer

Remove high-energy photons

Answer

Increase beam intensity