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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 410. Radiation Management |
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Subchapter 11. Use of X-Rays and /or Particles for Therapeutic Purposes in the Healing Arts and Veterinary Medicine |
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Part 3. THERAPEUTIC SYSTEMS OF LESS THAN 1 MEV |
SECTION 252:410-11-35. Timers
Latest version.
- Each <1 MeV system must be equipped with a timer having a display at the treatment control panel and a pre-set time selector. The timer must:(1) activate with the production of radiation and retain its reading after irradiation is interrupted. After irradiation is terminated and before irradiation can be reinitiated, it shall be necessary to reset the elapsed time indicator to zero;(2) terminate irradiation when a pre-selected time has elapsed if any dose monitoring system present has not previously terminated irradiation;(3) permit accurate presetting and determination of exposure times as short as 1 second;(4) not permit an exposure if set at zero;(5) not activate until the shutter is opened when irradiation is controlled by a shutter mechanism unless calibration includes a timer factor to compensate for mechanical lag; and(6) be accurate to within 1 percent of the selected value or 1 second, whichever is greater.