ABR Practice Exam Question 2: Answer

The answer is 3. NRC specifies that the dose equivalent in any unrestricted area from external sources should not exceed 0.02 mSv in-any-one-hour. Choice 5 is incorrect because the Rh is proportional to the maximum number (not the average number) of patient treatments in any one hour and the weekly time average dose equivalent rate.

For information on high-energy X-ray machine shielding design, go to NCRP Report No. 151

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