Okla. Admin. Code § 310:281-11-17

Current through Vol. 42, No. 7, December 16, 2024

Section 310:281-11-17 - Veterinary x-ray systems

(a)Systems.

(1) The system shall display the selected exposure factors before the exposure begins.

(A) The requirement of 310:281-11-17(a)(1)(A) may be met by permanent markings on equipment having fixed technique factors. Indication of technique factors shall be visible from the operator's position except in the case of spot films made by the fluoroscopist.

(B) The x-ray control shall provide visual indication of the production of x-rays observable at or from the operator's protected position whenever x-rays are produced.

(2) The leakage radiation from the diagnostic tube head assembly measured at a distance of 1 meter in any direction from the source shall not exceed 100 milliroentgens in 1 hour when the x-ray tube is operated at its leakage technique factors. Measurement is averaged over an area of 100 square centimeters with no linear dimension greater than 20 centimeters.

(3) The useful beam shall be restricted to the area of clinical interest and no larger than the size of the image receptor.

(4) Collimating devices shall be provided and shall limit the beam to the area of the image receptor to within 2 percent of the SID, and shall provide the same degree of protection as is required of the housing.

(5) The half-value layer of the useful beam shall not be less than 0.5 millimeter aluminum equivalent for systems operating up to 50 kVp, 1.5 millimeters aluminum equivalent for systems operating between 50 and 70 kVp, and 2 millimeters aluminum equivalent for systems operating above 70 kVp.

(6) A device shall be provided to terminate the exposure after a preset time or exposure.

(7) A dead-man type of exposure switch shall be provided, together with an exposure control cord of sufficient length, so that the operator can stand out of the useful beam and at least 6 feet from the animal during all x-ray exposures.

(8) The coefficient of variation for exposure shall not exceed 0.10 when all technique factors are held constant. This requirement is met when 4 exposures are made at identical technique factors, the value of the average exposure (E) is greater than or equal to 5 times the maximum exposure (E max) minus the minimum exposure (E min): E> 5(E max - E min)

(9) The primary beam shall be aligned with the film by using specified technique in the facility's operating procedures.

(10) Fluoroscopic and CT systems used in veterinary facilities shall meet the requirements of 310:281-11-13 and 310:281-11-15 respectively, except the aural communications requirements of 310:281-11-15(b)(1).

(11) Portable systems shall be used in a manner which complies with these rules.

(b)X-ray control location. Each x-ray control shall be located in such a way as to permit the operator to remain in an area of less than 2 millirems in any 1 hour during the entire exposure.

Okla. Admin. Code § 310:281-11-17

Added at 8 Ok Reg 3503, eff 8-15-91 (emergency); Added at 9 Ok Reg 1643, eff 5-29-92; Amended at 21 Ok Reg 1037, eff 5-13-04

Amended by Oklahoma Register, Volume 38, Issue 24, September 1, 2021, eff. 9/11/2021