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

5 mSv (0.5 rem)

Answer

20 mSv (2 rem)

Answer

100 mSv (10 rem)

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

Photoelectric effect

Answer

Coherent (Rayleigh) scattering

Answer

Pair production

Question 3

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

Accepted Answer

Thermoluminescent dosimeter (TLD)

Answer

Survey meter

Answer

Geiger-Müller counter

Answer

Ionization chamber survey meter

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

Dose increases proportionally with distance

Answer

Scatter increases with the square of field size

Answer

Beam intensity doubles with each HVL

Question 5

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

Accepted Answer

Rapidly dividing stem cells

Answer

Nerve cells

Answer

Muscle cells

Answer

Mature bone cells

Question 6

What is the main biological effect of concern when a pregnant patient requires x-ray examination?

Accepted Answer

Stochastic effects on the developing embryo/fetus

Answer

Maternal cataracts

Answer

Fetal bone hardening

Answer

Maternal hair loss

Question 7

What is characteristic radiation?

Accepted Answer

X-rays emitted when outer-shell electrons fill vacancies left by ejected inner-shell electrons

Answer

Radiation produced when electrons decelerate near a nucleus

Answer

Radiation emitted by radioactive nuclei

Answer

Scatter radiation from patient interactions