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All therapeutic X-ray installations shall comply with the following requirements:
(1) A therapeutic type protective X-ray tube housing shall be used. Contact therapy machines shall meet the additional requirement that leakage radiation at two inches from the surface of the protective tube housing shall not exceed 0.1 roentgen per hour.
(2) Permanent diaphragms or cones used for colliminating the useful beam shall afford the same degree of protection as is required of the tube housing.
(3) Adjustable or removable beam-defining diaphragms or cones shall transmit not more than five percent of the useful beam as determined at the maximum tube potential and with maximum treatment filter.
(4) Filters shall be securely held in place to prevent them from dropping out during treatment.
(5) The filter system shall be so arranged as to minimize the possibility of error in filter selection and alignment.
(6) The filter slot shall be so constructed that the radiation escaping through it does not produce an exposure exceeding one roentgen per hour at one meter, or if the radiation escaping from the slot is accessible to the patient, 30 roentgens per hour at two inches from the external opening.
(7) Removable filters shall be marked to indicate thickness and material.
(8) A filter indication system shall be used on all therapy machines using changeable filters, and shall indicate, from the control panel, the presence or absence of any filter, and shall be designed to permit easy recognition of the filter in place.
(9) The X-ray tube shall be so mounted that it cannot turn or slide with respect to the housing aperture.
(10) Means shall be provided to immobilize the tube housing during stationary portal treatment.
(11) A timer shall be provided to terminate the exposure after a preset time regardless of what other exposure limiting devices are present.
(12) Equipment utilizing shutters to control the useful beam shall have a shutter position indicator on the control.
(13) There shall be on the control panel an easily discernable indicator which provides positive indication of the production of X-rays.
(14) Mechanical and/or electrical stops shall be provided on X-ray therapy machines capable of operating at 150 kVp or above to insure that the useful beam is oriented only toward primary barriers.
(15) Interlocks shall be provided for X-ray therapy equipment capable of operating above 150 kVp so that when any door to the treatment room is opened X-ray production will be shut off automatically. After such shut off it shall be possible to restore X-ray production only from the control panel.
(16) The following additional requirements apply to X-ray therapy equipment operated at potentials of 60 kVp and below:
(A) automatic timers shall be provided which will permit accurate presetting and termination of exposure as short as one second;
(B) in the therapeutic application of equipment constructed with beryllium or other low-filtration windows, the registrant shall insure that the unfiltered radiation reaches only the part intended and that the useful beam is blocked at all times except when actually being used;
(C) machines having an output of more than 1,000 roentgens per minute at any accessible place shall not be left unattended without the power being shut off at the primary disconnecting means; and
(D) if the tube is hand-held during irradiation, the operator shall wear protective gloves and protective apron of no less than 0.5 millimeters lead equivalent.
History: Eff. 9/16/71, Register 39
Authority: AS 46.03.020
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The Alaska Administrative Code was automatically converted to HTML from a plain text format. Every effort has been made to ensure its accuracy, but neither Touch N' Go Systems nor the Law Offices of James B. Gottstein can be held responsible for any possible errors. This version of the Alaska Administrative Code is current through June, 2006.
If it is critical that the precise terms of the Alaska Administrative Code be known, it is recommended that more formal sources be consulted. Recent editions of the Alaska Administrative Journal may be obtained from the Alaska Lieutenant Governor's Office on the world wide web. If any errors are found, please e-mail Touch N' Go systems at E-mail. We hope you find this information useful. Copyright 2006. Touch N' Go Systems, Inc. All Rights Reserved.
Last modified 7/05/2006