U.S. Nuclear Regulatory Commission

Question 2: What are the requirements for including dose

from non-NRC-licensed sources (x-rays, accelerators, NORM)

as part of occupational dose?

Answer: The combined total of the doses from licensed and

unlicensed sources (other than background and medical

radiation) must be below the Part 20 occupational dose

limits. The requirement for inclusion of doses from

non-licensed sources is intended to account for

occupational doses received while working for activities or

with materials that are licensed or controlled by

organizations other than the NRC, e.g., states, DOE, etc..

Thus licensees must record and add the doses from

non-licensed sources to the doses from licensed sources to

obtain the total dose for comparison with the occupational

limit. (References: 10 CFR 20.1001, 10 CFR 20.1002, 10

CFR 20.1003, 10 CFR 20.1201)