RSO Radiation Sources and Equipment Safety 2

Question 1

The inverse square law states that radiation intensity from a point source varies with distance by:

Accepted Answer

Decreasing proportionally to the square of the distance

Answer

Decreasing linearly with distance

Answer

Decreasing exponentially with distance

Answer

Remaining constant until reaching the beam boundary

Question 2

Which shielding material is most appropriate for attenuating high-energy gamma radiation in a radiology facility?

Accepted Answer

Lead or concrete

Answer

Polyethylene (plastic)

Answer

Aluminum

Answer

Water only

Question 3

A survey meter reads zero after entering a high-dose-rate area. The RSO should suspect the detector is:

Accepted Answer

In saturation ('pinned') due to excessive dose rate overwhelming the detector electronics

Answer

Working correctly—no radiation is present

Answer

Calibrated in the wrong units

Answer

Out of battery

Question 4

The half-value layer (HVL) for a specific radiation/shielding combination is the thickness of material required to:

Accepted Answer

Reduce radiation intensity by 50%

Answer

Reduce radiation intensity by 90%

Answer

Absorb all radiation

Answer

Reduce dose rate to background levels

Question 5

A high-radiation area requiring a locked door or other physical controls is defined under NRC regulations where doses could exceed:

Accepted Answer

1 mSv/h (100 mrem/h)

Answer

0.05 mSv/h (5 mrem/h)

Answer

10 mSv/h (1,000 mrem/h)

Answer

50 mSv/h (5,000 mrem/h)

Question 6

Criticality safety is primarily a concern for RSOs working at facilities that handle:

Accepted Answer

Fissile materials such as enriched uranium or plutonium in sufficient quantities

Answer

Any sealed gamma source above 1 Curie

Answer

High-energy X-ray equipment above 500 kVp

Answer

Naturally occurring radioactive materials (NORM)