Underwater and Lay-barge Radiography

(A) Underwater and/or lay-barge radiography shall not be performed unless specifically authorized in a license issued by the agency in accordance with 105 CMR 120.360. (B) In addition to the other requirements of 105 CMR 120.300, the following requirements apply to the performance of lay-barge radiography: (1) Cobalt-60 sources with activities in excess of 740 GBq (20 Ci) (nominal) and iridium-192 sources with activities in excess of 3.70 TBq (100 Ci) (nominal) shall not be used in the performance of offshore platform or lay-barge radiography. (2) Collimators shall be used for all industrial radiographic operations performed on lay-barges.