ARRT - American Registry of Radiologic Technologists Radiation Physics and Radiobiology Questions and Answers

Question 1

According to the Law of Bergonie and Tribondeau, which of the following cells would be MOST radiosensitive?

Accepted Answer

Lymphocytes

Answer

Nerve cells

Answer

Muscle cells

Answer

Chondrocytes

Question 2

A radiation effect that has a threshold dose below which it does not occur, and whose severity increases as the dose increases, is known as what type of effect?

Accepted Answer

Deterministic (Non-stochastic)

Answer

Stochastic

Answer

Genetic

Answer

Latent

Question 3

Which of the following is a key characteristic of the photoelectric effect in diagnostic imaging?

Accepted Answer

It results in total absorption of the incident x-ray photon.

Answer

It is the primary interaction at very high kVp settings.

Answer

It involves an interaction with an outer-shell electron.

Answer

It is the main contributor to scatter radiation reaching the image receptor.

Question 4

The presence of oxygen in tissue during irradiation increases the biological damage caused by low-LET radiation. This phenomenon is known as the:

Accepted Answer

Oxygen Enhancement Effect

Answer

Relative Biologic Effectiveness (RBE)

Answer

Linear Energy Transfer (LET) effect

Answer

Law of Bergonie and Tribondeau

Question 5

Which of the following describes the relationship between Linear Energy Transfer (LET) and Relative Biologic Effectiveness (RBE)?

Accepted Answer

As LET increases, RBE increases to a maximum point and then decreases.

Answer

As LET decreases, RBE always increases.

Answer

LET and RBE are completely independent of each other.

Answer

As LET increases, RBE always decreases.

Question 6

A technologist is exposed to a small dose of radiation during a fluoroscopic procedure. Years later, a radiation-induced cancer develops. This type of late effect is classified as a:

Accepted Answer

Stochastic effect

Answer

Deterministic effect

Answer

Acute effect

Answer

Somatic threshold effect