Cal. Code Regs. tit. 17 § 30308

Current through Register 2025 Notice Reg. No. 2, January 10, 2025

Section 30308 - Radiographic Installations (Other Than Dental and Veterinary Medicine)

(a) Equipment.

(1) The tube housing shall be of diagnostic type.

(2) Suitable devices (diaphragms, cones, adjustable collimators), capable of restricting the useful beam to the area of clinical interest shall be provided to define the beam and shall provide the same degree of attenuation as that required of the tube housing. Such devices shall be calibrated in terms of the size of the projected useful beam at specified source-film distances. For chest photofluorographic equipment, the collimator shall restrict the beam to dimensions no greater than those of the fluorographic screen. The field size indication on adjustable collimators shall be accurate to within 2 percent of the source-film distance. The light field shall be aligned with the X-ray field with the same degree of accuracy.

(3) For equipment manufactured prior to August 1, 1974, the aluminum equivalent of the total filtration in the useful beam shall be not less than that shown in Table 1:Table 1

*Operating kVp*	*Minimum Total Filter (Inherent plus added)*
Below 50 kVp..........................	..........................0.5 mm aluminum
50-70 kVp..........................	..........................1.5 mm aluminum
Above 70 kVp..........................	..........................2.5 mm aluminum

For equipment manufactured on or after August 1, 1974, the half-value layer (HVL) of the useful beam for a given X-ray tube potential shall not be less than the appropriate value specified in Table 2.Table 2

*X-ray tube voltage (kilovolt peak)*
Designed Operating Range	Measured Minimum HVL	Minimum HVL (mm of Al)
Below 50	30	0.3
	40	0.4
	49	0.5
50 to 70	50	1.2
	60	1.3
	70	1.5
Above 70	70	2.1
	80	2.3
	90	2.5
	100	2.7
	110	3.0
	120	3.2
	130	3.5
	140	3.8
	150	4.1

(4) A device shall be provided to terminate the exposure after a pre-set time or exposure.

(5) A dead-man type of exposure switch shall be provided and so arranged that it cannot be conveniently operated outside a shielded area, except that exposure switches for "spot film" devices used in conjunction with fluoroscopic tables are excepted from this shielding requirement.

(6) The control panel shall include a device (usually a milliammeter) to give positive indication of the production of X-rays whenever the X-ray tube is energized.

(7) The control panel shall include devices (labeled control settings and/or meters) indicating the physical factors (such as kVp, mA, exposure time, or whether timing is automatic) used for the exposure.

(8) Machines equipped with beryllium window X-ray tubes shall contain keyed filter interlock switches in the tube housing and suitable indication on the control panel of the added filter in the useful beam if the total filtration permanently in the useful beam is less than 0.5 mm aluminum equivalent. The total filtration permanently in the useful beam shall be clearly indicated on the tube housing.

(9) The aluminum equivalent of the table top when a cassette tray is used under the table top, or the aluminum equivalent of the front panel of the vertical cassette holder, shall not be more than 1 mm at 100 kVp.

(b) Operating Procedures.

(1) No individual occupationally exposed to radiation shall be permitted to hold patients during exposures except during emergencies, nor shall any individual be regularly used for this service. If the patient must be held by an individual, that individual shall be protected with appropriate shielding devices such as protective gloves and apron and he shall be so positioned that no part of his body will be struck by the useful beam.

(2) Only individuals required for the radiographic procedure shall be in the radiographic room during exposure; and, except for the patient, all such persons shall be equipped with appropriate protective devices.

(3) The radiographic field shall be restricted to the area of clinical interest.

(4) Gonadal shielding of not less than 0.5 mm lead equivalent shall be used for patients who have not passed the reproductive age during radiographic procedures in which the gonads are in the direct beam, except for cases in which this would interfere with the diagnostic procedure.

(5) The operator shall stand behind the barrier provided for his protection during radiographic exposures.

Cal. Code Regs. Tit. 17, § 30308

1. Renumbering and amendment filed 9-4-73 as an emergency; effective upon filing (Register 73, No. 36). Approved by State Building Standards Commission 11-30-73.
2. Certificate of Compliance filed 12-28-73 (Register 73, No. 52).
3. Amendment filed 6-18-87; operative 7-18-87 (Register 87, No. 28).

Note: Authority cited: Sections 208 and 25811, Health and Safety Code. Reference: Sections 25801, 25802, 25811 and 25815, Health and Safety Code.