La. Admin. Code tit. 33 § XV-1741

Current through Register Vol. 50, No. 11, November 20, 2024

Section XV-1741 - Radiation Surveys

A. A radiation survey of the area outside the shielding of the radiation room of a panoramic irradiator shall be conducted with the sources in the exposed position before the facility starts to operate. A radiation survey of the area above the pool of irradiators shall be conducted after the sources are loaded, but before the facility starts to operate. Additional radiation surveys of the shielding shall be performed at intervals not to exceed three years and before resuming operation after addition of new sources or any modification to the radiation room shielding or structure that might increase dose rates.

B. If the radiation levels specified in LAC 33:XV.1717 are exceeded, the facility shall be modified to comply with the requirements in LAC 33:XV.1717.

C. Portable radiation survey meters shall be calibrated at least annually to an accuracy of ±20 percent for the gamma energy of the sources in use. The calibration shall be done at two points on each scale or, for digital instruments, at one point per decade over the range that shall be used. Portable radiation survey meters shall be of a type that does not saturate and read zero at high radiation dose rates.

D. Water from the irradiator pool, other potentially contaminated liquids, and sediments from pool vacuuming shall be monitored for radioactive contamination before release to unrestricted areas. Radioactive concentrations shall not exceed those specified in LAC 33:XV.499.Appendix B.Table II, Column 2, or Appendix B.Table III, "Annual Limits on Intake (ALIs) and Derived Air Concentrations (DAC) of Radionuclides for Occupational Exposure, Effluent Concentrations, Concentrations for Release to Sanitary Sewerage."

E. Before releasing resins for unrestricted use, they shall be monitored before release in an area with a background level less than 0.5 microsievert (0.05 mrem) per hour. The resins may be released only if the survey does not detect radiation levels above background radiation levels. The survey meter used shall be capable of detecting radiation levels of 0.5 microsievert (0.05 mrem) per hour.

La. Admin. Code tit. 33, § XV-1741

Promulgated by the Department of Environmental Quality, Office of Air Quality and Radiation Protection, Radiation Protection Division, LR 24:2118 (November 1998).

AUTHORITY NOTE: Promulgated in accordance with R.S. 30:2001 et seq.