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

A glove box provides an enclosed, controlled environment allowing workers to manipulate radioactive materials through attached gloves without direct contact or exposure.

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

Tritium's very low-energy beta (18.6 keV max) cannot be detected directly in air; air samples are collected and analyzed by liquid scintillation counting.

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

NRC surface contamination limits for unrestricted areas are 1,000 dpm/100 cm² (beta/gamma); 450 dpm/100 cm² exceeds this, requiring posting and restriction.

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

Fixed contamination is radioactive material bound to a surface that is not readily removable by wiping, contact, or normal operations.

Question 5

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

Accepted Answer

0.1 DAC

Answer

Under 10 CFR 20.1003, an airborne radioactivity area exists where concentrations exceed 0.1 DAC or where a worker could receive an intake exceeding 12 DAC-hours in a week.

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

NRRPT Contamination and Airborne Control 2