NRRPT Contamination and Airborne Control 2

Question 1

What is the primary purpose of a glove box in radiological work?

Accepted Answer

Provide a ventilated enclosure to handle radioactive materials without direct contact

Answer

Store radioactive samples at controlled temperature

Answer

Filter airborne particulates before release to the environment

Answer

Monitor personnel dose during handling operations

Question 2

Which instrument is most appropriate for detecting low-level tritium (H-3) air contamination?

Accepted Answer

Liquid scintillation counter after air sample collection

Answer

Geiger-Mueller detector

Answer

Ionization chamber air monitor

Answer

Sodium iodide scintillation detector

Question 3

A smear survey shows 450 dpm/100 cm² of beta activity on an uncontrolled surface. What action is required per NRC guidelines?

Accepted Answer

Post a Caution - Radioactive Material sign and restrict access

Answer

No action needed; below all limits

Answer

Decontaminate immediately; the level exceeds the 5,000 dpm/100 cm² limit but not the emergency threshold

Answer

Evacuate the area and notify the NRC immediately

Question 4

What does 'fixed' contamination mean in radiation protection?

Accepted Answer

Radioactive material that cannot be removed from a surface by normal contact

Answer

Contamination that has been formally documented in a survey record

Answer

Contamination permanently attached using a fixative spray

Answer

Contamination of a fixed installation rather than portable equipment

Question 5

An airborne radioactivity area is defined as a location where airborne activity exceeds what DAC fraction?

Accepted Answer

0.1 DAC

Answer

1 DAC

Answer

10 DAC

Answer

100 DAC

Question 6

Which ventilation design principle is most effective at preventing the spread of radioactive contamination from a hot cell to adjacent areas?

Accepted Answer

Maintaining the hot cell at negative pressure relative to the corridor

Answer

Maintaining the hot cell at positive pressure relative to the corridor

Answer

Using HEPA filtration on all supply air

Answer

Exhausting air horizontally away from personnel

Question 7

A worker's nasal smear after removing respiratory protection shows detectable activity. What does this indicate?

Accepted Answer

Potential respiratory tract deposition and possible internal contamination intake

Answer

The air sampling result was false-positive

Answer

The face seal was adequate but the filter was overloaded

Answer

Background radiation affecting the detector