Subchapter C. CLOSED-BEAM RADIATION-PRODUCING DEVICES
Sec.
227a.30. System enclosure.
227a.31. Interlocks.
227a.32. Interlock functions.
227a.33. Radiation emission limit.
227a.34. Security screening devices.
227a.35. Electron microscope devices.§ 227a.30. System enclosure.
The radiation source, sample or object, detector and analyzing crystal, if used, of a closed-beam radiation-producing device must be enclosed in a chamber or coupled chambers that cannot be entered by any part of the body during normal operation.
§ 227a.31. Interlocks.
Doors and panels accessing the closed-beam radiation-producing device must be interlocked. The interlocks required by this section must be of a fail-safe design.
§ 227a.32. Interlock functions.
The closed-beam radiation-producing device enclosure, sample chamber, or other similar closure must be interlocked with the X-ray tube high voltage supply or a shutter in the primary beam, or both, so that no X-ray beam can enter the sample or object chamber while the chamber is open unless the interlock has been conspicuously and deliberately defeated. The interlock required by this section must be of fail-safe design or have adequate administrative controls to ensure that operations will only continue with a proper functioning interlock.
§ 227a.33. Radiation emission limit.
The radiation emission for a closed-beam radiation-producing device may not exceed a dose rate of 0.5 mrem (0.005 mSv) in 1 hour at 5 centimeters outside any accessible surface.
Cross References This section cited in 25 Pa. Code § 227a.14 (relating to generating cabinet or high voltage source radiation emission limits).
§ 227a.34. Security screening devices.
Closed-beam security screening devices must have a mechanism to ensure operator presence at the control area in a location that enables surveillance of the openings and doors of the control area during generation of radiation. The following apply:
(1) During an exposure or preset succession of exposures of 0.5 second or greater duration, the closed-beam radiation-producing device must have a mechanism to enable the operator to terminate the exposure or preset succession of exposures at any time.
(2) During an exposure or preset succession of exposures of less than 0.5 second duration, the closed-beam radiation-producing device must have a mechanism to allow completion of the exposure in progress but must enable the operator to prevent additional exposures.
§ 227a.35. Electron microscope devices.
(a) Labeling. A closed-beam electron microscope device must be labeled with a conspicuous sign bearing the words, ‘‘Caution Radiation—This Equipment Produces Radiation When Energized,’’ or words containing a similar warning.
(b) Maximum radiation level. Radiation levels measured 5 centimeters from an accessible surface of a closed-beam electron microscope may not exceed 0.5 mrem (0.005 mSv) per hour.
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