ABR Practice Exam Question 2 – Shielding

August 11, 2009 · Written by MDPhysics.com · mdphysicsblog@gmail.com

In a shielding evaluation (Survey) of a new vault that housed a Varian linear accelerator, In-Any-One-Hour Time Averaged Dose Equivalent Rate (Rh) was found to be 2.5 mr/hr in the unrestricted area. Which of the following are true?  (There may be multiple answers)

1- Rh is only applicable for a restricted area.

2- It is over the limit for restricted area and some action should be taken.

3- It is over the limit for unrestricted area and some action should be taken.

4- Rh is only applicable for radioactive materials shielding survey.

5- Value of Rh depends on average number of patient treatments in any one hour and the weekly time averaged dose equivalent rate.

Click here for the answer to ABR Practice Exam Question 2.

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