NRRPT Radiological Control & Safety Procedures 4

Question 1

When must a radiation protection technician perform a pre-job briefing before radiological work?

Accepted Answer

Before all work covered by a Radiological Work Permit

Answer

Pre-job briefings are required before all RWP-controlled work to ensure all workers understand radiological hazards, controls, dose limits, and emergency procedures.

Question 2

An 'extremely high radiation area' (EHRA) under 10 CFR 20 requires what additional physical control beyond standard HRA requirements?

Accepted Answer

Physical controls (not just administrative controls) that prevent inadvertent entry

Answer

EHRAs require physical controls such as locked doors or gates that prevent inadvertent or unauthorized entry, beyond mere posting and administrative barriers.

Question 3

Which instrument is most appropriate for detecting and measuring low-energy beta contamination such as C-14 or H-3?

Accepted Answer

Liquid scintillation counter for H-3; thin-window GM for C-14

Answer

H-3 emits very low-energy betas that require liquid scintillation counting, while C-14's betas require a thin-window GM detector because standard detectors cannot detect their low energies.

Question 4

What is the purpose of posting a 'Radioactive Material' area sign per 10 CFR 20?

Accepted Answer

To warn individuals that quantities of radioactive material exceeding certain thresholds are present

Answer

Radioactive Material area postings warn personnel that quantities of radioactive material above regulatory thresholds specified in 10 CFR 20 Appendix C are present.

Question 5

A worker's thyroid bioassay reveals an uptake of I-131 that results in a committed dose equivalent of 15 rem. Under 10 CFR 20, what is the occupational limit for thyroid dose?

Accepted Answer

50 rem per year

Answer

The occupational dose limit for the thyroid under 10 CFR 20.1201(a)(2) is 50 rem (0.5 Sv) committed dose equivalent per year.

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

(NRRPT) National Registry of Radiation Protection Technicians Practice Test

NRRPT Radiological Control & Safety Procedures 4