Radiation Safety & Protection Flashcards

What is the annual occupational dose limit for the lens of the eye according to NRC regulations?

Answer: 150 mSv

The NRC sets the annual occupational dose limit for the lens of the eye at 150 mSv (15 rem).

Which type of radiation has the greatest penetrating power?

Answer: Gamma rays

Gamma rays have the greatest penetrating power and can pass through several centimeters of lead.

In the ALARA principle, what does the 'R' stand for?

Answer: Reasonable

ALARA stands for As Low As Reasonably Achievable, guiding radiation dose reduction efforts.

A radiation worker receives a skin dose of 300 mSv in one year. How does this compare to the regulatory limit?

Answer: It is within the limit of 500 mSv

The NRC annual skin dose limit is 500 mSv (50 rem), so 300 mSv is within regulatory limits.

Which dosimeter provides a real-time reading of radiation exposure in the field?

Answer: Pocket ionization chamber

Pocket ionization chambers (direct-reading dosimeters) provide immediate, real-time radiation exposure readings.

What is the primary purpose of a posted radiation area sign in industrial radiography?

Answer: To warn personnel of elevated radiation levels

Radiation area signs warn personnel that dose rates in the area may exceed regulatory thresholds.

Which factor does NOT reduce radiation exposure in the workplace?

Answer: Increasing source activity

Increasing source activity increases radiation output and thus increases worker exposure rather than reducing it.