(a) Replacement of any sealed source in a radiographic exposure device, and leak testing, repair, tagging, opening or any other modification of any sealed source shall be performed only by persons specifically authorized by the Department to do so pursuant to Group 2 of this subchapter.

(b) Leak testing of sealed sources and radiographic exposure devices using depleted uranium (DU) shielding and an S-tube configuration shall be performed in accordance with section 30275 except that testing of radiographic exposure devices shall be tested for DU contamination at intervals not to exceed 12 months. If the test reveals the presence of 0.005 microcuries or more of removable DU contamination, the radiographic exposure device shall be removed from service and an evaluation of the S-tube shall be made. If the evaluation reveals that the S-tube is worn through, the radiographic exposure device shall not be used. Radiographic exposure devices with DU shielding need not be tested while in storage and not in use except that before using or transferring such a device, the device shall be tested for DU contamination if the interval of storage or non-use exceeded 12 months.