25 Pa. Code § 227a.13 - Radiation source housing
(a)
Interlock. When the X-ray tube housing is the primary shielding for the X-ray tube and is intended to be opened for normal use or maintenance, the housing must be equipped with an interlock that shuts off the high voltage to the X-ray tube if the housing is opened.
(b)
Radiation emission limit. Except as specified elsewhere in this chapter, each X-ray tube housing must be constructed so that, with all shutters closed, the leakage radiation measured at 5 centimeters from the X-ray tube housing surface does not exceed 2.5 mrem (0.025 mSv) per hour. This limit must be met at the maximum tube rating.
Notes
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