# 30 Tex. Admin. Code § 336.309: 30 TAC § 336.309. Determination of Prior Occupational Dose > Texas · Regulations · In force URL: https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_309 ## Section - **Citation:** 30 Tex. Admin. Code § 336.309 - **Heading:** 30 TAC § 336.309. Determination of Prior Occupational Dose - **Jurisdiction:** Texas - **Kind:** Regulations - **Status:** In force - **Text as of:** August 14, 2026 - **Source:** Compiled text - **Location:** Texas Administrative Code / Title 30 ENVIRONMENTAL QUALITY / Part 1 TEXAS COMMISSION ON ENVIRONMENTAL QUALITY / Chapter 336 RADIOACTIVE SUBSTANCE RULES / 30 TAC § 336.309 ## Text (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. ## Nearby sections - [30 Tex. Admin. Code § 336.301 30 TAC § 336.301. Purpose and Scope](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_301.md) - [30 Tex. Admin. Code § 336.302 30 TAC § 336.302. Definitions](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_302.md) - [30 Tex. Admin. Code § 336.303 30 TAC § 336.303. Implementation](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_303.md) - [30 Tex. Admin. Code § 336.304 30 TAC § 336.304. Radiation Protection Programs](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_304.md) - [30 Tex. Admin. Code § 336.305 30 TAC § 336.305. Occupational Dose Limits for Adults](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_305.md) - [30 Tex. Admin. Code § 336.306 30 TAC § 336.306. Compliance with Requirements for Summation of External and Internal Doses](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_306.md) - [30 Tex. Admin. Code § 336.307 30 TAC § 336.307. Determination of External Dose from Airborne Radioactive Material](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_307.md) - [30 Tex. Admin. Code § 336.308 30 TAC § 336.308. Determination of Internal Exposure](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_308.md) - [30 Tex. Admin. Code § 336.309 30 TAC § 336.309. Determination of Prior Occupational Dose](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_309.md) - [30 Tex. Admin. Code § 336.310 30 TAC § 336.310. Planned Special Exposures](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_310.md) - [30 Tex. Admin. Code § 336.311 30 TAC § 336.311. Occupational Dose Limits for Minors](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_311.md) - [30 Tex. Admin. Code § 336.312 30 TAC § 336.312. Dose Equivalent to an Embryo/Fetus](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_312.md) - [30 Tex. Admin. Code § 336.313 30 TAC § 336.313. Dose Limits for Individual Members of the Public](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_313.md) - [30 Tex. Admin. Code § 336.314 30 TAC § 336.314. Compliance with Dose Limits for Individual Members of the Public](https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_314.md) --- Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_TX_TAC_T30_P1_C336_S336_309. Check the current official text before relying on it. Not legal advice.