NRRPT Decontamination & Exposure Prevention 5

Question 1

A Contamination Area posting requires surveys to be performed at what minimum frequency under typical NRC-licensed facility procedures?

Accepted Answer

At the frequency specified in the facility's radiation protection program, often daily or before each entry

Answer

Survey frequency is dictated by the facility's RP program and radiological conditions; contamination areas typically require surveys before entry or daily at minimum.

Question 2

Which of the following best describes the 'doffing' sequence for protective clothing to minimize self-contamination?

Accepted Answer

Remove outer gloves first, then hood, then booties, then coveralls, rolling outward as removed

Answer

Proper doffing removes outer gloves first to enable clean handling of other items, then proceeds systematically rolling contaminated surfaces inward to prevent spread.

Question 3

What is the significance of a radionuclide's 'effective half-life' in internal contamination assessment?

Accepted Answer

It combines physical decay and biological elimination to predict how long the body retains significant activity

Answer

Effective half-life accounts for both physical radioactive decay and biological clearance, determining how long internally deposited activity delivers dose to the body.

Question 4

HEPA filters used in respiratory protection and ventilation systems are rated to capture particles at what minimum efficiency?

Accepted Answer

99.97% of particles 0.3 micrometers and larger

Answer

HEPA filters must capture at least 99.97% of airborne particles at 0.3 micrometers (the most penetrating particle size), ensuring highly effective removal of radioactive aerosols.

Question 5

A worker receives a positive nasal smear result after working in a potentially airborne contamination environment. This finding primarily indicates:

Accepted Answer

Possible inhalation of radioactive material, warranting bioassay to assess internal dose

Answer

A positive nasal smear indicates potential inhalation and requires bioassay (whole-body count or urinalysis) to determine if material reached the lungs and to estimate committed dose.

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

NRRPT Decontamination & Exposure Prevention 5