La. Admin. Code tit. 33 § XV-410

Current through Register Vol. 50, No. 9, September 20, 2024

Section XV-410 - Occupational Dose Limits for Adults

A. The licensee or registrant shall control the occupational dose to individual adults, except for planned special exposures pursuant to LAC 33:XV.415, to the following dose limits:

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

a. the total effective dose equivalent being equal to 0.05 Sv (5 rem); 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 0.5 Sv (50 rem); and

2. the annual limits to the lens of the eye, to the skin of the whole body, and to the skin of the extremities, which are:

a. a lens dose equivalent of 0.15 Sv (15 rem); and

b. a shallow dose equivalent of 0.5 Sv (50 rem) to the skin of the whole body or to the skin of any extremity.

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. See LAC 33:XV.415.A.5.a and b.

C. When the external exposure is determined by measurement with an external personal monitoring device, the deep-dose equivalent shall be used in place of the effective dose equivalent, unless the effective dose equivalent is determined by a dosimetry method approved by the department. The assigned deep dose equivalent shall be for the part of the body receiving the highest exposure. The assigned shallow dose equivalent shall be the dose averaged over the contiguous 10 square centimeters of skin receiving the highest exposure. The deep dose equivalent, lens 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. If a protective apron is worn while working with medical fluoroscopic equipment and monitoring is conducted as specified in LAC 33:XV.431, the effective dose equivalent for external radiation shall be determined using one of the following methods.

1. When only one individual monitoring device is used and it is located at the neck outside the protective apron, the reported deep dose equivalent shall be the effective dose equivalent for external radiation.

2. When only one individual monitoring device is used and it is located at the neck outside the protective apron, and the reported dose exceeds 25 percent of the limit specified in this Section, the reported deep dose equivalent value, multiplied by 0.3, shall be the effective dose equivalent for external radiation.

3. When individual monitoring devices are worn, both under the protective apron at the waist and outside the protective apron at the neck, the effective dose equivalent for external radiation shall be assigned the value of the sum of the deep dose equivalent reported for the individual monitoring device located at the waist under the protective apron, multiplied by 1.5, and the deep dose equivalent reported for the individual monitoring device located at the neck outside the protective apron, multiplied by 0.04.

E. Derived air concentration (DAC) and annual limit on intake (ALI) values are specified in Table I of LAC 33:XV.499.Appendix B and may be used to determine the individual's dose and to demonstrate compliance with the occupational dose limits. See LAC 33:XV.476.

F. Notwithstanding 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. See Endnote 3 of LAC 33:XV.499.Appendix B.

G. 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. See LAC 33:XV.414.E and F.

La. Admin. Code tit. 33, § XV-410

Promulgated by the Department of Environmental Quality, Nuclear Energy Division, LR 13:569 (October 1987), amended by the Office of Air Quality and Radiation Protection, Radiation Protection Division, LR 19:1421 (November 1993), LR 22:969 (October 1996), amended by the Office of Environmental Assessment, Environmental Planning Division, LR 26:2769 (December 2000), LR 30:1188 (June 2004), amended by the Office of the Secretary, Legal Division, LR 40:1341 (July 2014).

AUTHORITY NOTE: Promulgated in accordance with R.S. 30:2001 et seq., and 2104.B.(1).