Radiation Health and Safety Test Radiation Health and Safety Test Radiation Protection & Shielding 2

Question 1

What is the recommended annual radiation dose limit for members of the general public from licensed operations?

Accepted Answer

1 mSv (100 mrem)

Answer

The NRC limits public exposure from licensed nuclear operations to 1 mSv (100 mrem) per year, reflecting the stricter standard applied to non-occupationally exposed individuals.

Question 2

Which device is used to detect and measure radiation in an area to ensure safe working conditions?

Accepted Answer

Geiger-Müller counter

Answer

A Geiger-Müller (GM) counter detects ionizing radiation by measuring the ionization current in a gas-filled tube and is widely used for area surveys.

Question 3

What is the primary radiation hazard associated with radioiodine (I-131) used in nuclear medicine?

Accepted Answer

Internal contamination via inhalation or ingestion concentrating in the thyroid

Answer

I-131 is both a beta and gamma emitter; its primary hazard is internal contamination, as the thyroid selectively accumulates iodine, leading to high local radiation doses.

Question 4

What is the half-value layer (HVL) in radiation shielding?

Accepted Answer

The thickness of material that reduces radiation intensity by 50%

Answer

The HVL is the thickness of a specified material required to attenuate the intensity of a radiation beam to one-half of its original value.

Question 5

For pregnant radiation workers, what is the NRC recommended equivalent dose limit to the embryo/fetus during the entire gestational period?

Accepted Answer

5 mSv (500 mrem)

Answer

The NRC limits fetal dose to 5 mSv (500 mrem) over the entire gestation period once pregnancy is declared, with an additional monthly limit of 0.5 mSv.

Radiation Health and Safety Test Practice Test

Radiation Health and Safety Test Practice Test

Radiation Health and Safety Test Radiation Health and Safety Test Radiation Protection & Shielding 2