NRRPT Dosimetry and Exposure Control 4

Question 1

A worker's quarterly TEDE is calculated by summing the deep dose equivalent (DDE) and the committed effective dose equivalent (CEDE). If DDE = 300 mrem and CEDE = 120 mrem, what is the TEDE?

Accepted Answer

420 mrem

Answer

TEDE = DDE + CEDE = 300 mrem + 120 mrem = 420 mrem.

Question 2

The Annual Limit on Intake (ALI) for a radionuclide is defined as the intake that would result in a committed effective dose equivalent of:

Accepted Answer

5 rem (0.05 Sv)

Answer

The ALI is the intake of a radionuclide in a year that would result in a committed effective dose equivalent of 5 rem (0.05 Sv), the annual occupational limit.

Question 3

In whole-body counting, which detection method is most commonly used to measure gamma-emitting internal contamination in a worker?

Accepted Answer

NaI(Tl) or HPGe scintillation/semiconductor detector system

Answer

Whole-body counters use large NaI(Tl) scintillators or HPGe detectors to directly measure gamma photons emitted from internal radionuclides.

Question 4

Under the 10 CFR Part 20 dose constraint concept for air emissions, licensees must constrain doses to individual members of the public to what level?

Accepted Answer

10 mrem/yr

Answer

10 CFR 20.1101(d) requires licensees to constrain airborne radioactive emissions so that doses to individual members of the public do not exceed 10 mrem/yr.

Question 5

Which administrative control sets dose limits lower than regulatory limits to ensure workers don't inadvertently exceed legal limits?

Accepted Answer

Administrative control level (ACL)

Answer

Administrative control levels (ACLs) are internal organizational limits set below regulatory limits to provide a safety margin and trigger corrective action before limits are exceeded.

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

NRRPT Dosimetry and Exposure Control 4