New York Codes, Rules and Regulations › Title 6 - DEPARTMENT OF ENVIRONMENTAL CONSERVATION › Chapter IV - QUALITY SERVICES › Subchapter C - RADIATION › Part 380 - Prevent and Control of Environmental Pollution by Radioactive Materials › Subpart 380-11 - Annual Limits on Intake (ALI) and Derived Air Concentrations (DAC) Of Radionuclides For Occupational Exposure; Effluent Concentrations; Concentrations For Release To Sewerage › Section 380-11.4 - Table II Effluent Concentrations

Current through Register Vol. 46, No. 28, July 10, 2024
(a) The columns in Table II of this Subpart
					 captioned "Effluents," "Air," and "Water," are applicable to the assessment and
					 control of dose to the public, particularly in the implementation of the
					 provisions of section
					 380-5.2 
					 of this Part. The concentration values given in Columns 1 and 2 of Table II are
					 equivalent to the radionuclide concentrations which, if inhaled or ingested
					 continuously over the course of a year, would produce a total effective dose
					 equivalent of 0.05 rem (50 millirems or 0.5 millisieverts) to reference man,
					 except for noble gasses. For noble gasses, the concentration values given in
					 Column 1 of Table II are equivalent to the radionuclide concentration that would
					 produce a total effective dose equivalent of 0.10 rem (100 millirems or 1
					 millisieverts) due to submersion.
(b)
					 Consideration of non-stochastic limits has not been included in deriving the air
					 and water effluent concentration values because non-stochastic effects are
					 presumed not to occur at the dose levels established for individual members of
					 the public. For radionuclides, where the non-stochastic limit was governing in
					 deriving the occupational DAC, the stochastic ALI was used in deriving the
					 corresponding airborne effluent limit in Table II. For this reason, the DAC and
					 airborne effluent limits are not always proportional.
(c) The air concentration values listed in
					 Table II, Column 1 were derived by one of two methods. For those radionuclides
					 for which the stochastic limit is governing, the occupational stochastic
					 inhalation ALI was divided by 2.4 x 109, relating the
					 inhalation ALI to the DAC, as explained above, and then divided by a factor of
					 300. The factor of 300 includes the following components: a factor of 50 to
					 relate the 5-rem annual occupational dose limit to the 0.1-rem limit for members
					 of the public; a factor of 3 to adjust for the difference in exposure time and
					 the inhalation rate for a worker and that for members of the public; and a factor
					 of 2 to adjust the occupational values (derived for adults) so that they are
					 applicable to other age groups.
(d)
					 For those radionuclides for which submersion (external dose) is limiting, the
					 occupational DAC in Table I, Column 3, was divided by 219. The factor of 219 is
					 composed of a factor of 50, as described above, and a factor of 4.38 relating
					 occupational exposure for 2,000 hours per year to full-time exposure (8,760 hours
					 per year). Note that an additional factor of 2 for age considerations is not
					 warranted in the submersion case.
(e)
					 The water concentrations were derived by taking the most restrictive occupational
					 stochastic oral ingestion ALI and dividing by 7.3 x
					 107. The factor of 7.3 x
					 107 (ml) includes the following components: the
					 factors of 50 and 2 described above and a factor of 7.3 x
					 105 (ml) which is the annual water intake of Reference
					 Man.
(f) Note 2 in section
					 380-11.7 
					 of this Subpart provides groupings of radionuclides which are applicable to
					 unknown mixtures of radionuclides. These groupings (including occupational
					 inhalation ALIs and DACs, air and water effluent concentrations and sewerage)
					 require demonstrating that the most limiting radionuclides in successive classes
					 are absent. The limit for the unknown mixture is defined when the presence of the
					 one of the listed radionuclides cannot be definitely excluded as being present
					 either from knowledge of the radionuclide composition of the source or from
					 actual measurements.