NAC459.612. X-ray and electron therapy installations: Spot checks.

     1. A spot check must be made daily with use and include carefully selected representative or indicative measurements which will demonstrate the consistency of relevant machine operating characteristics or lack of those characteristics.

     2. The spot-check methods must be in writing and have been designed by a qualified expert.

     3. Spot checks which are erratic or inconsistent with calibration data must be investigated promptly.

     4. For machines in which beam quality may vary significantly, spot checks must include quality checks.

     5. Whenever a spot check indicates a significant change, as specified in the qualified expert’s spot-check design, in the operating characteristics of a machine, the machine must be recalibrated as required in subsection 5 of NAC 459.610.

     6. Where a machine has built-in devices which provide a self-check of any parameter during irradiation, that parameter may be spot checked weekly instead of daily.

     7. A log must be kept of all spot-check measurements.

     [Bd. of Health, Radiation Control Reg. §§ 6.9.3.4-6.9.3.4.7, eff. 2-28-80]