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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 252:410-11-32. Beam-limiting devices
Latest version.
- (a) Removable beam-limiting devices. Removable beam-limiting devices shall, for the portion of the useful beam to be blocked by these devices, transmit not more than 1 percent of the useful beam at the maximum kV and maximum treatment filter. This requirement does not apply to auxiliary blocks or materials placed in the useful beam to shape the useful beam to the individual patient.(b) Adjustable beam-limiting devices.(1) Pre-1989 adjustable beam-limiting devices shall, for the portion of the x-ray beam to be blocked by these devices, transmit not more than 5 percent of the useful beam at the maximum kV and maximum treatment filter.(2) Post-1989 adjustable beam-limiting devices shall meet the requirements of Subsection (a) of this Section.(c) Permanent beam-limiting devices. Permanent fixed diaphragms or cones used for limiting the size of the useful beam shall provide the same or a higher degree of protection as required for the tube housing assembly.