Document: 10 CFR Part 20
Document ID: 496fbe07-3a88-4fd9-99ef-7c21806974ec
Document Type: cfr
Title: Occupational dose limits for adults.
Source: 10 CFR Part 20
Source URL: https://www.ecfr.gov/current/title-10/part-20/section-20.1201
Revision Date: 
Chapter: 
Section ID: 20.1201
CFR Part: 20
CFR Title: 10

Content:
§ 20.1201 Occupational dose limits for adults. ( a ) The licensee shall control the occupational dose to individual adults, except for planned special exposures under § 20.1206 , to the following dose limits. ( 1 ) An annual limit, which is the more limiting of— ( i ) The total effective dose equivalent being equal to 5 rems (0.05 Sv); or ( ii ) 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). ( 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: ( i ) A lens dose equivalent of 15 rems (0.15 Sv), and ( ii ) A shallow-dose equivalent of 50 rem (0.5 Sv) 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, must be subtracted from the limits for planned special exposures that the individual may receive during the current year (see § 20.1206(e)(1) ) and during the individual's lifetime (see § 20.1206(e)(2) ). ( c ) When the external exposure is determined by measurement with an external personal monitoring device, the deep-dose equivalent must be used in place of the effective dose equivalent, unless the effective dose equivalent is determined by a dosimetry method approved by the NRC. The assigned deep-dose equivalent must be for the part of the body receiving the highest exposure. The assigned shallow-dose equivalent must 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