N.Y. Comp. Codes R. & Regs. tit. 6 § 380-11.4

Current through Register Vol. 46, No. 25, June 18, 2024

Section 380-11.4 - Table II Effluent Concentrations

(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.

N.Y. Comp. Codes R. & Regs. Tit. 6 § 380-11.4

Amended New York State Register April 25, 2018/Volume XL, Issue 17, eff. 5/10/2018