§ 227a.18. Operating requirements.
(a) Procedures. Normal operating procedures shall be written and available to all radiation-producing device workers. An individual may not operate a radiation-producing device in a manner other than that specified in the normal operating procedures unless the individual has obtained written approval of the RSO.
(b) Bypassing.
(1) An individual may not bypass a safety device or interlock, and may not remove shielding, unless the individual has obtained approval of the RSO. The approval shall be limited to a specified period of time.
(2) When a safety device or interlock has been bypassed, a conspicuous sign bearing the words ‘‘SAFETY DEVICE NOT WORKING,’’ or words having a similar intent, shall be placed on the radiation source housing and at the control switch.
(3) A record of a bypass of a safety device or interlock shall be maintained for 5 years. The record must contain all of the following information:
(i) The date the bypass was made.
(ii) A detailed description of the bypass.
(iii) The length of time the unit remained in the altered condition.
(iv) The post bypass survey as noted in § 227a.15 (relating to surveys).
(v) Other relevant information for the bypass.
(4) A record of a bypass shall be signed by the RSO, the individual who performed the bypass and the individual who restored the unit to its original condition.
(c) Control panel.
(1) The radiation-producing device may only be activated from a control panel.
(2) Indicators and controls that control the primary beam must be identifiable and discernible through the use of labels, symbols, software displays or equivalent methods.
(d) Interlocks.
(1) An interlock may not be used to de-activate the X-ray tube of a radiation-producing device, except in an emergency or during testing of the interlock system.
(2) After an interlock is triggered, resetting the radiation-producing device to full operation must only be possible from a control panel.
(3) Interlocks must be of a fail-safe design.
(e) Multiple sources. If more than one X-ray tube assembly or focal spot can be operated sequentially or simultaneously from a control panel, visual indicators must identify which tube assembly or focal spot has been selected. The selectors must be identified as to their function. If a letter or number is used, a reference card or table explaining the code must be affixed to the control panel.
Cross References This section cited in 25 Pa. Code § 227a.15 (relating to surveys).
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