§ 227a.53. Radiation-producing devices used in vehicle security screening.
(a) Procedure for human exposure. When the procedures for operation of a mobile or transportable radiation-producing device used for security screening of vehicles includes knowingly exposing human occupants to the primary beam when screening vehicles, structures or containers, the system is subject to the same requirements as provided in § 227a.52(1)—(5) (relating to radiation-producing devices used in individual security screening).
(b) Minimizing human exposure. If vehicle occupants are knowingly exposed to the primary beam of a security screening device and the requirements in § 227a.52(3)—(5) cannot be met, then there shall be means to ensure the occupied portion of the vehicle is outside of the scan area while the primary beam is emitted or procedures shall be established and implemented to ensure that no occupants are present in the vehicle during screening.
(c) Dosage limits. The effective dose to an individual for a single inadvertent exposure to the primary beam must not exceed 500 mrem (5 mSv). The reliability of the procedure used to ensure that a vehicle to be scanned is unoccupied must be commensurate with the potential severity of an inadvertent exposure. A pre-screening with a mode or system that can meet the limits under § 227a.52(3)—(5) shall be used to verify that the vehicle being examined is unoccupied if the 500 mrem (5 mSv) limit cannot be ensured.
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