California Code of Regulations › Title 17 - Public Health › Division 1 - State Department of Health Services › Chapter 5 - Sanitation (Environmental) › Subchapter 4 - Radiation › Group 3 - Standards for Protection Against Radiation › Article 4 - Special Requirements for the Use of X-Ray in the Healing Arts › Section 30308 - Radiographic Installations (Other Than Dental and Veterinary Medicine)

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(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.