R 333.5057 Occupational dose limits for adults.

Rule 57. (1) A registrant shall control the occupational dose to individual adults, to the following dose limits: (a) An annual limit, which is the more limiting of the following: (i) The effective dose equivalent of 0.05 sievert (5 rem). (ii) The dose equivalent to an individual organ or tissue other than the lens of the eye of 0.5 sievert (50 rem). (b) 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 the following: (i) A lens dose equivalent of 0.15 sieverts (15 rem). (ii) A shallow dose equivalent of 0.5 sievert (50 rem) to the skin of the whole body or to the skin of an extremity. (2) For exposure determined by measurement with an external individual 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. (3) 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. (a) If the individual monitoring device was not in the region of highest potential exposure or the results of individual monitoring are unavailable, the deep dose equivalent, lens dose equivalent, and shallow dose equivalent may be assessed from surveys or other radiation measurements to demonstrate compliance with the occupational dose limits. (b) When a protective apron is worn while working with medical fluoroscopic equipment and monitoring is conducted as specified in R 333.5065, the effective dose equivalent shall be determined by any of the following: (i) When only 1 individual monitoring device is used and it is located at the neck (collar) outside the protective apron, the reported deep dose equivalent shall be the effective dose equivalent for external radiation. (ii) When only 1 individual monitoring device is used and it is located at the neck outside the protective apron, and the reported dose exceeds 25% of the limit specified in subrule (1) of this rule, the reported deep dose equivalent value multiplied by 0.3 shall be the effective dose equivalent for external radiation. (iii) When 2 individual monitoring devices are worn, 1 under the protective apron at the waist and the other 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. (4) The 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 another person during the current year. Requirements for determining prior occupational exposure are provided in R 333.5080. Editor's Note: An obvious error in R 325.5057 was corrected at the request of the promulgating agency, pursuant to Section 56 of 1969 PA 306, as amended by 2000 PA 262, MCL 24.256. The rule containing the error was published in Michigan Register, 2016 MR 10. The memorandum requesting the correction was published in Michigan Register, 2016 MR 16.