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. DHS 157.22(5)(d)2.2. A licensee or registrant is not required to partition historical dose between external dose equivalents and internal committed dose equivalents. Further, occupational exposure histories obtained and recorded on the department’s occupational radiation exposure form or equivalent before the effective date of August 1, 2002, may not have included effective dose equivalent, but may be used in the absence of specific information on the intake of radionuclides by the individual. DHS 157.22(5)(e)(e) If a licensee or registrant is unable to obtain a complete record of an individual’s current and previously accumulated occupational dose, a licensee or registrant shall assume all the following: DHS 157.22(5)(e)1.1. In establishing administrative controls under sub. (1) (f) for the current year, that the allowable dose limit for the individual is reduced by 12.5 mSv (1.25 rem) for each quarter for which records were unavailable and the individual was engaged in activities that could have resulted in occupational radiation exposure. DHS 157.22(5)(f)(f) A licensee or registrant shall retain the records on the department’s occupational radiation exposure form or equivalent until the department terminates each pertinent license or registration requiring this record. A licensee or registrant shall retain records used in preparing the occupational radiation exposure form or equivalent for 3 years after the record is made. DHS 157.22 NoteNote: The Department’s 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. DHS 157.22(6)(6) Planned special exposures. A licensee or registrant may authorize an adult worker to receive doses in addition to and accounted for separately from the doses received under the limits specified in sub. (1) provided that each of the following conditions is satisfied: