NANTeL Radiation Protection and ALARA 2

Question 1

Which of the three ALARA principle controls directly reduces the intensity of radiation reaching a worker?

Accepted Answer

Shielding

Answer

Time

Answer

Distance

Answer

Ventilation

Question 2

A worker doubles their distance from a point radiation source. By what factor does dose rate change according to the inverse square law?

Accepted Answer

Decreases by a factor of 4

Answer

Decreases by half

Answer

Decreases by a factor of 8

Answer

Remains the same

Question 3

In nuclear facilities, which type of radiation is most effectively shielded by high-density materials such as lead or concrete?

Accepted Answer

Gamma rays

Answer

Alpha particles

Answer

Beta particles

Answer

Neutrons

Question 4

What is the primary purpose of a whole-body count (WBC) performed on nuclear plant workers?

Accepted Answer

Detect internal contamination from radionuclides

Answer

Measure external dose rate

Answer

Calibrate dosimeters

Answer

Determine shielding requirements

Question 5

Under 10 CFR Part 20, what is the annual occupational dose limit for the whole body?

Accepted Answer

5 rem (50 mSv)

Answer

1 rem (10 mSv)

Answer

15 rem (150 mSv)

Answer

25 rem (250 mSv)

Question 6

Which personal protective equipment (PPE) is LEAST effective at protecting against gamma radiation exposure?

Accepted Answer

Anti-contamination clothing (anti-C)

Answer

Lead apron

Answer

Lead gloves

Answer

Lead thyroid shield

Question 7

What does the term 'controlled area' mean in the context of NRC regulations at a nuclear facility?

Accepted Answer

An area where access and occupancy are controlled for radiation protection purposes

Answer

An area where dose rates exceed 100 mrem/hr

Answer

An area restricted to radiation protection staff only

Answer

An area where only respirators are required