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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 5. THERAPEUTIC SYSTEMS OF 1 MEV AND ABOVE |
SECTION 252:410-11-53. Filters
Latest version.
- (a) Markings. Each filter which is removable from a system of 1 MeV or more shall be clearly marked with an identification number. A description of the filter must be kept at the control panel. For wedge filters, the wedge angle shall appear on the wedge or wedge tray.(b) Design criteria.(1) If the absorbed dose rate data required by 252:410-11-64 relates exclusively to operation with a field flattening filter in place that is used to provide dose uniformity over the area of the useful beam of x-rays at a specified depth or a beam scattering filter in place, such filter shall be removable only by the use of tools.(2) For post-1989 systems which utilize wedge filters, interchangeable field flattening filters, or interchangeable beam scattering foils:(A) irradiation shall not be possible until a selection of a filter has been made at the treatment control panel or a positive selection to use "no filter";(B) an interlock system shall prevent irradiation if the filter selected is not in the correct position;(C) a display shall be provided at the treatment control panel identifying the filter(s) in use; and(D) an interlock shall prevent irradiation if any filter selection operation carried out in the treatment room does not agree with the filter selection operation carried out at the treatment control panel.