N. C. Regulations for Protection Against Radiation

15A NCAC 11 .1604          OCCUPATIONAL DOSE LIMITS FOR ADULTS

(a)  The licensee or registrant shall control the occupational dose to individual adults, except for planned special exposures as provided in Rule .1608 of this Section, to the following dose limits:

(1)           an annual limit, which is the more limiting of:

(A)          the total effective dose equivalent being equal to five rems (0.05Sv); or

(B)           the sum of the deep-dose equivalent and the committed dose equivalent to any individual organ or tissue other than the lens of the eye being equal to 50 rems (0.5 Sv); and

(2)           the annual limits to the lens of the eye, to the skin, and to the extremities which are:

(A)          an eye dose equivalent of 15 rems (0.15 Sv), and

(B)           a shallow-dose equivalent of 50 rems (0.50 Sv) to the skin or to each of the extremities.

(b)  Doses received in excess of the annual limits, including doses received during accidents, emergencies, and planned special exposures, shall be subtracted from the limits for planned special exposures that the individual may receive during the current year and during the individual's lifetime.  Dose limits for planned special exposures are provided in Item (5) of Rule .1608 of this Section.

(c)  The assigned deep-dose equivalent and shallow-dose equivalent shall be for the part of the body receiving the highest exposure.  The deep-dose equivalent, eye dose equivalent and shallow-dose equivalent may be assessed from surveys or other radiation measurements for the purpose of demonstrating compliance with the occupational dose limits, if the individual monitoring device was not in the region of highest potential exposure, or the results of individual monitoring are unavailable.

(d)  Derived air concentration (DAC) and annual limit on intake (ALI) values are presented in Table 1 of Appendix B to 10 CFR §§ 20.1001 - 20.2401 and may be used to determine the individual's dose and to demonstrate compliance with the occupational dose limits.

(e)  In addition to the annual dose limits, the licensee shall limit the soluble uranium intake by an individual to 10 milligrams in a week in consideration of chemical toxicity.  Requirements for annual limits on intake for uranium are provided in Appendix B to 10 CFR §§ 20.1001 - 20.2401.

(f)  The licensee or registrant shall reduce the dose that an individual may be allowed to receive in the current year by the amount of occupational dose received while employed by any other person.  Requirements for determining prior occupational exposure are provided in Rule .1638(e) of this Section.

History Note:        Authority G.S. 104E-7(a)(2);

Eff. January 1, 1994.

NC Radiation Protection, 1645 Mail Service Center,
Raleigh, NC  27699-1645  919-571-4141  Fax  919-571-4148