Section 336.309 - Determination of Prior Occupational Dose(a) For each individual who is likely to receive in a year an occupational dose requiring monitoring under § 336.316 of this title (relating to Conditions Requiring Individual Monitoring of External and Internal Occupational Dose), the licensee shall determine the occupational radiation dose received during the current year.(b) Before permitting an individual to participate in a planned special exposure, the licensee shall determine: (1) the internal and external doses from all previous planned special exposures; and(2) all doses in excess of the limits, including doses received during accidents and emergencies, received during the lifetime of the individual.(c) In complying with the requirements of subsection (a) or (b) of this section, a licensee may: (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; and(2) accept, as the record of lifetime cumulative radiation dose, an up-to-date form "Cumulative Occupational Exposure History" (see §336.367, Appendix J of this title (relating to Appendix J. Cumulative Occupational Exposure History)) or equivalent, signed by the individual and countersigned by an appropriate official of the most recent employer for work involving radiation exposure, or the individual's current employer, if the individual is not employed by the licensee; and(3) obtain 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, by telephone, telegram, electronic media, or letter. The licensee shall request a written verification of the dose data if the authenticity of the transmitted report cannot be established.(d) The licensee shall record individual exposure histories.(1) The licensee shall record the exposure history of each individual, as required by subsection (a) or (b) of this section, on form "Cumulative Occupational Exposure History" (see §336.367, Appendix J of this title) or other clear and legible record which includes all of 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 the licensee obtains reports, the licensee shall use the dose shown in the report in preparing form "Cumulative Occupational Exposure History" (see §336.367, Appendix J of this title) or equivalent. For any period for which the licensee does not obtain a report, the licensee shall place a notation on form "Cumulative Occupational Exposure History" (see §336.367, Appendix J of this title) or equivalent indicating the periods of time for which data are not available.(2) Licensees are not required to separate historical dose, obtained and recorded before January 1, 1994, into external dose equivalent(s) and internal committed dose equivalent(s). Further, occupational exposure histories obtained and recorded on form "Cumulative Occupational Exposure History" (see §336.367, Appendix J of this title) or equivalent before January 1, 1994, would not have included effective dose equivalent but may be used in the absence of specific information on the intake of radionuclides by the individual.(e) If the licensee is unable to obtain a complete record of an individual's current and previously accumulated occupational dose, the licensee shall assume: (1) in establishing administrative controls under § 336.305(f) of this title (relating to Occupational Dose Limits for Adults) for the current year, that the allowable dose limit for the individual is reduced by 1.25 rems (12.5 millisieverts) for each quarter for which records are unavailable and that the individual was engaged in activities that could have resulted in occupational radiation exposure; and(2) that the individual is not available for planned special exposures.(f) The licensee shall retain the records on form "Cumulative Occupational Exposure History" (see §336.367, Appendix J of this title) or equivalent until the executive director terminates each pertinent license requiring this record. The licensee shall retain records used in preparing form "Cumulative Occupational Exposure History" (see §336.367, Appendix J of this title) for three years after the record is made. This includes records required under the standards for protection against radiation in effect prior to January 1, 1994.30 Tex. Admin. Code § 336.309
The provisions of this §336.309 adopted to be effective June 5, 1997, 22 TexReg 4588; amended to be effective February 2, 2012, 37 TexReg 335