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

Bioassay programs detect and quantify radionuclides inside the body to estimate internal dose commitments from inhalation or ingestion.

Question 2

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

Accepted Answer

In-vivo bioassay

Answer

In-vivo bioassay uses whole-body or lung counters to directly detect gamma and X-ray emissions from radionuclides inside the body.

Question 3

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

Accepted Answer

Inhalation

Answer

Inhalation is the most significant route for most workplace radionuclides because aerosols and gases are readily drawn deep into the lungs.

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

CEDE is the 50-year integrated effective dose resulting from a single intake event, accounting for the long-term retention and decay of the radionuclide.

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

The DAC is the airborne radionuclide concentration that, if breathed for 2,000 hours, would deliver one annual limit on intake (ALI).

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

NRRPT Internal Dosimetry and Bioassay