ARRT Radiation and Safety 4

Question 1

What is the effective dose limit for a declared pregnant radiation worker during the entire gestation period?

Accepted Answer

5 mSv

Answer

NCRP recommends limiting fetal dose to no more than 5 mSv (0.5 rem) over the entire gestational period once pregnancy is declared.

Question 2

Which radiation quantity measures the energy deposited per unit mass of tissue?

Accepted Answer

Absorbed dose (Gray)

Answer

Absorbed dose, measured in Gray (Gy), quantifies energy deposited per kilogram of absorbing material (1 Gy = 1 J/kg).

Question 3

Somatic effects of radiation are those that:

Accepted Answer

Occur in the exposed individual themselves

Answer

Somatic effects are radiation effects that manifest in the directly exposed individual, as opposed to genetic effects that appear in offspring.

Question 4

The inverse square law states that radiation intensity is:

Accepted Answer

Inversely proportional to the square of the distance

Answer

The inverse square law states that intensity is inversely proportional to the square of the distance, so doubling distance reduces intensity to one-quarter.

Question 5

Which of the following best describes a stochastic radiation effect?

Accepted Answer

Probability of occurrence increases with dose, but severity does not

Answer

Stochastic effects (e.g., radiation-induced cancer) have no threshold; their probability increases with dose, but severity of the effect (e.g., cancer) does not depend on dose.

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT Radiation and Safety 4