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 30312 - Therapeutic X-Ray Installations

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) The
						user shall ensure therapeutic X-ray equipment meets the following:
(1) The tube housing shall be of therapeutic
						type.
(2) For equipment installed on or
						before August 1, 1979, permanent diaphragms or cones used for collimating the useful
						beam shall afford the same degree of protection as the housing. Adjustable or
						removable beam-defining diaphragms or cones shall transmit not more than 5 percent
						of the useful beam obtained at the maximum kilovoltage and with maximum treatment
						filter.
(3) For equipment installed
						after August 1, 1979, permanent beam-defining devices or diaphragms shall afford the
						same degree of protection as the housing. Adjustable or interchangeable
						beam-defining devices shall transmit no more than 2 percent of the useful beam for
						the portion of the useful beam which is to be attenuated by the beam limiting
						device. Measurements shall be averaged over an area up to but not exceeding 100
						square centimeters at the normal treatment distance.
(4) Filters shall be secured in place to prevent
						them from dropping out during treatment. A filter indication system shall be used on
						all therapy machines using interchangeable filters. It shall indicate, from the
						control panel, or from the control station, the presence or absence of any filter
						except compensating filters, and it shall be designed to permit easy identification
						of the filter in place. The filter slot shall be so constructed that the radiation
						escaping through it does not exceed 1 roentgen per hour at 1 meter, or, if the
						patient is likely to be exposed to radiation escaping from the slot, 30 roentgens
						per hour at 5 centimeters from the external opening. Each interchangeable filter
						shall be marked with its thickness and material.
(5) The X-ray tube shall be so mounted that it
						cannot turn or slide with respect to the aperture.
(6) Means shall be provided to immobilize the tube
						housing during stationary portal treatment.
(7) A suitable exposure control device such as an
						automatic timer, exposure meter, or dose meter shall be provided to terminate the
						exposure after a preset time interval or preset exposure or dose limit. A timer
						shall be provided to terminate the exposure after a preset time regardless of what
						other exposure limiting devices are present. Means shall be provided for the
						operator to terminate the exposure at any time.
(8) Equipment utilizing shutters to control the
						useful beam shall have a shutter position indicator on the control.
(9) An easily discernible indicator which shows
						whether or not X-rays are being produced shall be on the control panel.
(10) Mechanical and/or electrical stops shall be
						provided on X-ray machines capable of operating at 150 kVp or above to insure that
						the useful beam is oriented only toward primary barriers.
(11) When the relationship between the beam
						interceptor (when present) and the useful beam is not permanently fixed, mechanical
						or electrical stops shall be provided to insure that the beam is oriented only
						toward primary barriers.