GXMO Radiation Physics and Safety 3

Question 1

What is the annual occupational effective dose limit for radiation workers in the United States?

Accepted Answer

50 mSv (5 rem)

Answer

NCRP Report No. 116 sets the annual occupational effective dose limit at 50 mSv (5 rem) for radiation workers.

Question 2

Which type of radiation interaction results in a scattered photon with less energy than the incident photon and a recoil electron?

Accepted Answer

Compton scattering

Answer

In Compton scattering, the incident photon transfers part of its energy to a free or loosely bound outer-shell electron, scattering both the electron and a lower-energy photon.

Question 3

Which personal dosimeter provides the most accurate measurement of cumulative radiation dose over time?

Accepted Answer

Thermoluminescent dosimeter (TLD)

Answer

TLDs store energy from ionizing radiation in crystal lattice traps and release it as light when heated, providing accurate cumulative dose measurements.

Question 4

What does the term 'inverse square law' describe in radiation physics?

Accepted Answer

Dose rate is inversely proportional to the square of the distance from the source

Answer

The inverse square law states that radiation intensity is inversely proportional to the square of the distance from the source: doubling the distance reduces intensity to one-quarter.

Question 5

Which tissue type is considered most radiosensitive according to the law of Bergonié and Tribondeau?

Accepted Answer

Rapidly dividing stem cells

Answer

Bergonié and Tribondeau stated that cells are most radiosensitive when they are undifferentiated, rapidly dividing, and have a long mitotic future.

(GXMO) General X-Ray Machine Operator Practice Test

(GXMO) General X-Ray Machine Operator Practice Test

GXMO Radiation Physics and Safety 3