NRRPT - National Registry of Radiation Protection Technicians Contamination and Airborne Control Questions and Answers

Question 1

A technician performs a wipe survey for removable contamination.
The wipe is counted in an instrument with a 35% efficiency for the beta emitter of concern.
If the net count rate for the wipe is 700 cpm, what is the removable contamination level in disintegrations per minute (dpm)?

Accepted Answer

2000 dpm

Answer

245 dpm

Answer

700 dpm

Answer

1225 dpm

Question 2

According to 10 CFR 20, which of the following conditions requires an area to be posted as an "Airborne Radioactivity Area"?

Accepted Answer

An individual present in the area without respiratory protection could exceed 12 DAC-hours in a week.

Answer

The measured concentration of airborne radioactive material exceeds 10% of the DAC.

Answer

The use of any respiratory protection is mandatory for entry.

Answer

An individual could receive an intake of 1% of the Annual Limit on Intake (ALI).

Question 3

A worker must enter an area with a general airborne concentration of a specific radionuclide measured at 20 DAC. The worker will wear a full-face, air-purifying respirator. What is the effective airborne concentration inside the respirator mask?

Accepted Answer

0.4 DAC

Answer

2.0 DAC

Answer

1000 DAC

Answer

20 DAC

Question 4

Which of the following describes the primary function of a High-Efficiency Particulate Air (HEPA) filter used in nuclear ventilation systems?

Accepted Answer

To remove at least 99.97% of airborne particles with a size of 0.3 micrometers.

Answer

To absorb radioactive noble gases from the exhaust airstream.

Answer

To cool the air being exhausted to prevent thermal damage to ductwork.

Answer

To remove moisture from the air to prevent condensation in the system.

Question 5

During a routine survey, a worker is found to have a small spot of removable radioactive contamination on their forearm. What is the most appropriate initial action?

Accepted Answer

Gently wash the affected area with mild soap and lukewarm water.

Answer

Immediately apply duct tape to the spot to lift the contamination.

Answer

Scrub the area vigorously with a stiff brush and industrial solvent.

Answer

Report directly to an off-site medical facility for evaluation.

Question 6

What is the primary purpose of maintaining a negative pressure differential in a radiological containment enclosure, such as a glovebox or hot cell, relative to the surrounding room?

Accepted Answer

To ensure that any potential leakage flows from the surrounding room into the containment.

Answer

To increase the efficiency of the HEPA filters by creating higher airflow.

Answer

To provide a constant flow of fresh air to cool internal components.

Answer

To reduce the external radiation dose rate for personnel outside the containment.