Section 144-220-E-C-7 - Locking of radiographic exposure devices, storage containers and source changersA. Each radiographic exposure device must have a lock or outer locked container designed to prevent unauthorized or accidental removal of the sealed source from its shielded position. The exposure device and/or its container must be kept locked at all times (and if a keyed lock, with the key removed at all times) when not under the direct visual surveillance of a radiographer or radiographer's assistant except at permanent radiographic installations as stated in E.12. In addition, during radiographic operations the sealed source assembly must be secured in the shielded position each time the source is returned to that position.B. Each sealed source storage container and source changer must have a lock or outer locked container designed to prevent unauthorized or accidental removal of the sealed source from its shielded position. Storage containers and source changers must be kept locked (and if a keyed lock, with the key removed at all times) when containing sealed sources except when under the direct surveillance of a radiographer or a radiographer's assistant.C. Each radiographic exposure device, storage container, and source changer shall be locked and the key removed from any lock prior to being transported from one location and also prior to being stored at a given location.D. Locking and permanent storage precautions. (1) Radiographic exposure devices, source changers, and transport containers that contain sealed sources shall be secured while in storage to prevent tampering or removal by unauthorized individuals.(2) Radiographic exposure devices, source changers, or transport containers that contain radioactive material may not be stored in residential locations. This section does not apply to storage of radioactive material in a vehicle in transit for use at temporary job sites, if the licensee complies with all applicable sections of this Part and if the vehicle does not constitute a permanent storage location as described in this Part.10-144 C.M.R. ch. 220, § E-C-7