DHS 157.22(4)(c)(c) When the physical and biochemical properties of the radionuclides taken into the body or the behavior of the material in an individual is known, a licensee or registrant may do any of the following: DHS 157.22(4)(c)1.1. Use that information to calculate the committed effective dose equivalent, and, if used, the licensee or registrant shall document that information in the individual’s record. DHS 157.22(4)(c)2.2. Upon prior approval of the department, adjust the DAC or ALI values to reflect the actual physical and chemical characteristics of airborne radioactive material, for example, aerosol size distribution or density. DHS 157.22(4)(c)3.3. Separately assess the contribution of fractional intakes of Class D, W or Y compounds of a given radionuclide to the committed effective dose equivalent. DHS 157.22 NoteNote: See Appendix E for a description of the pulmonary clearance times of the compounds involved in the exposure.
DHS 157.22(4)(d)(d) If a licensee or registrant chooses to assess intakes of Class Y material using the measurements given in par. (a) 2. or 3., a licensee or registrant may delay the recording and reporting of the assessments for periods up to 7 months, unless otherwise required by s. DHS 157.32 (2) or (3). DHS 157.22 NoteNote: The delay permits the licensee or registrant to make additional measurements basic to the assessments.
DHS 157.22(4)(e)(e) If the identity and concentration of each radionuclide in a mixture are known, the fraction of the DAC applicable to the mixture for use in calculating DAC-hours shall be either of the following: DHS 157.22(4)(e)1.1. The sum of the ratios of the concentration to the appropriate DAC value, that is, D, W or Y, from Appendix E for each radionuclide in the mixture. DHS 157.22(4)(e)2.2. The ratio of the total concentration for all radionuclides in the mixture to the most restrictive DAC value for any radionuclide in the mixture. DHS 157.22(4)(f)(f) If the identity of each radionuclide in a mixture is known, but the concentration of one or more of the radionuclides in the mixture is not known, the DAC for the mixture shall be the most restrictive DAC of any radionuclide in the mixture. DHS 157.22(4)(g)(g) When a mixture of radionuclides in air exists, a licensee or registrant may disregard certain radionuclides in the mixture if all of the following apply: DHS 157.22(4)(g)2.2. The concentration of any radionuclide disregarded is less than 10% of its DAC. DHS 157.22(4)(g)3.3. The sum of the percentages under subds. 1. and 2. for all of the radionuclides disregarded in the mixture does not exceed 30%. DHS 157.22(4)(h)(h) When determining the committed effective dose equivalent, the following information may be considered: DHS 157.22(4)(h)1.1. To calculate the committed effective dose equivalent, the licensee or registrant may assume that the inhalation of one ALI, or an exposure of 2,000 DAC-hours, results in a committed effective dose equivalent of 0.05 Sv (5 rem) for radionuclides that have their ALIs or DACs based on the committed effective dose equivalent. DHS 157.22(4)(h)2.2. For an ALI and the associated DAC determined by the non-stochastic organ dose limit of 0.5 Sv (50 rem), the intake of radionuclides that would result in a committed effective dose equivalent of 0.05 Sv (5 rem), that is, the stochastic ALI, is listed in parentheses in Table I of ch. DHS 157 Appendix E. The licensee or registrant may, as a simplifying assumption, use the stochastic ALI to determine committed effective dose equivalent. However, if the licensee or registrant uses the stochastic ALI, the licensee or registrant shall also demonstrate that the limit in s. DHS 157.22 (1) (a) 1. b. is met. DHS 157.22(5)(a)(a) For each individual who may enter a licensee’s or registrant’s restricted area and is likely to receive, in a year, an occupational dose requiring monitoring under s. DHS 157.25 (2), a licensee or registrant shall determine the occupational radiation dose received during the current year. DHS 157.22(5)(b)(b) Before an individual may participate in a planned special exposure, a licensee or registrant shall determine all of the following: DHS 157.22(5)(b)1.1. The internal and external doses from all previous planned special exposures. DHS 157.22(5)(b)2.2. All doses in excess of the limits, including doses received during accidents and emergencies, received during the lifetime of the individual. DHS 157.22(5)(c)(c) In complying with the requirements of par. (a), a licensee or registrant may use either of the following means: DHS 157.22(5)(c)1.1. Accept, as a record of the occupational dose that the individual received during the current year, a written signed statement from the individual, or from the individual’s most recent employer for work involving radiation exposure, that discloses the nature and the amount of any occupational dose that the individual received during the current year. DHS 157.22(5)(c)2.2. Obtain, by telephone, facsimile, electronic media or letter, reports of the individual’s dose equivalent from the most recent employer for work involving radiation exposure, or the individual’s current employer, if the individual is not employed by the licensee or registrant. A licensee or registrant shall request a written verification of the dose data if the authenticity of the transmitted report cannot be established. DHS 157.22(5)(d)1.1. A licensee or registrant shall record the exposure history, as required by par. (a), on an occupational radiation exposure form provided by the department, or other clear and legible record of all the information required on that form. The form or record shall show each period in which the individual received occupational exposure to radiation or radioactive material and shall be signed by the individual who received the exposure. For each period for which a licensee or registrant obtains reports, a licensee or registrant shall use the dose shown in the report in preparing the occupational radiation exposure form or equivalent. For any period in which a licensee or registrant does not obtain a report, a licensee or registrant shall place a notation on the occupational radiation exposure form or equivalent indicating the periods of time for which data are not available. DHS 157.22 NoteNote: An occupational radiation exposure history form may be obtained by writing to: Department of Health Services, Radiation Protection Section, P.O. Box 2659, Madison WI 53701-2659; or by downloading the form from the Department website at: http://dhs.wisconsin.gov/radiation/Index.htm.