NRRPT Internal Dosimetry and Bioassay

Question 1

What is the primary purpose of bioassay in radiation protection?

Accepted Answer

To estimate internal radioactive material uptake in workers

Answer

To measure external radiation dose rates

Answer

To calibrate survey instruments

Answer

To assess environmental contamination levels

Question 2

Which type of bioassay measures radioactivity directly in the body using external detectors?

Accepted Answer

In-vivo bioassay

Answer

Indirect bioassay

Answer

In-vitro bioassay

Answer

Excretion bioassay

Question 3

Which route of internal contamination typically delivers the highest dose for most radionuclides encountered in nuclear facilities?

Accepted Answer

Inhalation

Answer

Ingestion

Answer

Skin absorption

Answer

Wound entry

Question 4

What does the committed effective dose equivalent (CEDE) represent?

Accepted Answer

The 50-year dose commitment from a single intake of radioactive material

Answer

The dose received in a single acute exposure event

Answer

The cumulative external dose over a career

Answer

The dose limit for a controlled area

Question 5

What is the derived air concentration (DAC) used for in internal dosimetry?

Accepted Answer

To establish the airborne concentration that equals one ALI when inhaled for a full work year

Answer

To set external dose rate limits in controlled areas

Answer

To measure stack effluent activity

Answer

To calibrate air samplers

Question 6

What is the annual limit on intake (ALI) based on for occupational workers?

Accepted Answer

The intake that results in a committed effective dose of 5 rem or a committed dose equivalent of 50 rem to any organ

Answer

The dose that doubles the cancer risk in a population

Answer

The maximum airborne concentration permissible

Answer

The NRC's emergency dose limit