CRI Radiation Safety & Protection 2

Question 1

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

Accepted Answer

150 mSv

Answer

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

Question 2

Which type of radiation has the greatest penetrating power?

Accepted Answer

Gamma rays

Answer

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

Question 3

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

Accepted Answer

Reasonable

Answer

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

Question 4

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

Accepted Answer

It is within the limit of 500 mSv

Answer

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

Question 5

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

Accepted Answer

Pocket ionization chamber

Answer

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

(CRI) Certified Radiographic Interpreter Practice Test