Internal Dosimetry and Bioassay Flashcards
6 cards from real NRRPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Internal Dosimetry and Bioassay flashcards as text
What is the primary purpose of bioassay in radiation protection?
Answer: To estimate internal radioactive material uptake in workers
Bioassay programs detect and quantify radionuclides inside the body to estimate internal dose commitments from inhalation or ingestion.
Which type of bioassay measures radioactivity directly in the body using external detectors?
Answer: In-vivo bioassay
In-vivo bioassay uses whole-body or lung counters to directly detect gamma and X-ray emissions from radionuclides inside the body.
Which route of internal contamination typically delivers the highest dose for most radionuclides encountered in nuclear facilities?
Answer: Inhalation
Inhalation is the most significant route for most workplace radionuclides because aerosols and gases are readily drawn deep into the lungs.
What does the committed effective dose equivalent (CEDE) represent?
Answer: The 50-year dose commitment from a single intake of radioactive material
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.
What is the derived air concentration (DAC) used for in internal dosimetry?
Answer: To establish the airborne concentration that equals one ALI when inhaled for a full work year
The DAC is the airborne radionuclide concentration that, if breathed for 2,000 hours, would deliver one annual limit on intake (ALI).
What is the annual limit on intake (ALI) based on for occupational workers?
Answer: The intake that results in a committed effective dose of 5 rem or a committed dose equivalent of 50 rem to any organ
ALI is the lesser of the intake yielding 5 rem CEDE to the whole body or 50 rem committed dose equivalent to any single organ or tissue.