§ 227a.55. Shielded room radiation-producing devices.
(a) Control of access. A room used for shielded room X-ray radiography must be shielded so that every location on the exterior meets conditions for an unrestricted area. Access to the room may only be through openings that are interlocked. The openings must be interlocked so that the radiation source cannot operate unless all openings are securely closed and meet the requirement of 10 CFR 20.1601 (relating to control of access to high radiation areas).
(b) Physical radiation survey. The operator shall conduct a physical radiation survey to determine that the radiation source is deenergized prior to each entry into the radiographic exposure area.
(c) Radiation monitoring system. The operator may use an independent radiation monitoring system that displays the radiation intensity or displays when radiation levels have returned to their pre-irradiation levels as an alternative to subsection (b).
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