§ 175.13 Occupational Dose Limits.
RCNY § 175.13
(a)The registrant must control the occupational dose to individual adults to the following dose limits: (1) an annual limit, which is the more limiting of: (i) the total effective dose equivalent being equal to 0.05 sievert (5 rem); 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 0.5 sievert (50 rem).
(2)the annual limits to the lens of the eye, to the skin, and to the extremities which are: (i) a lens dose equivalent of 0.15 sievert (15 rem); and (ii) a shallow dose equivalent of 0.5 sievert (50 rem) to the skin or to any extremity.
(b)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 Department. The assigned deep dose equivalent shall be for the portion 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: (1) when a protective apron is worn while working with medical fluoroscopic equipment and monitoring is conducted as specified in 24 RCNY Health Code § 175.17(b)(4), the effective dose equivalent for external radiation shall be determined as follows: when only one individual monitoring device is used and it is located at the neck (collar) outside the protective apron, the reported deep dose equivalent value divided by 5.6 shall be the effective dose equivalent for external radiation; or (2) 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.
(c)The registrant must reduce the dose that an individual may be allowed to receive in the current year by the occupational dose amount received while employed elsewhere during the current year.
(d)The annual occupational dose limits for minors are 10 percent of the annual occupational dose limits for adult workers specified in this section.
(e)Dose to an embryo/fetus.
(1)The registrant must ensure that the dose equivalent to the embryo/fetus during the entire pregnancy, due to occupational exposure of a declared pregnant worker, does not exceed 5 mSv (0.5 rem).
(3)The dose to an embryo/fetus shall be the sum of: (i) the deep dose equivalent to the declared pregnant worker; and (ii) the dose equivalent to the embryo/fetus resulting from radionuclides in the embryo/fetus and radionuclides in the declared pregnant worker.
(4)If, by the time the worker declares pregnancy to the registrant, the dose equivalent to the embryo/fetus is found to have exceeded 5 mSv (0.5 rem), or is within 0.5 mSv (50 mrem) of this dose, the registrant shall be deemed to be in compliance with this subdivision if the additional dose to the embryo/fetus does not exceed 0.5 mSv (50 mrem) during the remainder of the pregnancy. (Added City Record 4/24/2019, eff. 5/24/2019)
