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

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

Question 2

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

Accepted Answer

Ionizing radiation

Answer

Ionizing radiation carries enough energy to eject electrons from atoms, creating ion pairs that can damage biological tissue.

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

The HVL is the thickness of a specified material required to reduce the primary radiation beam intensity to 50% of its original value.

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

In the photoelectric effect, the x-ray photon is totally absorbed and its energy is used to eject a bound inner-shell electron called a photoelectron.

Question 5

Which of the following best describes the ALARA principle?

Accepted Answer

As Low As Reasonably Achievable

Answer

ALARA stands for As Low As Reasonably Achievable, guiding radiation workers to minimize exposure while still accomplishing the diagnostic task.

(GXMO) General X-Ray Machine Operator Practice Test

(GXMO) General X-Ray Machine Operator Practice Test

GXMO Radiation Physics and Safety 2