Section 120.901 - Purpose and Scope(A)105 CMR 120.900 prescribes requirements for the issuance of a license or certificate of registration authorizing the use of sources of radiation for well logging in a single well. 105 CMR 120.900 also establishes radiation safety requirements for persons using sources of radiation for wireline service operations including mineral logging, radioactive markers, and subsurface tracer studies. The requirements of 105 CMR 120.900 are in addition to, and not in substitution for, the requirements of 105 CMR 120.001, 120.020, 120.750, 120.100 and 120.200.(B)105 CMR 120.900 applies to all licensees or registrants who use sources of radiation for wireline service operations including mineral logging, radioactive markers, uranium sinker bars, or subsurface tracer studies. 105 CMR 120.900 does not apply to the use of radioactive material in tracer studies involving multiple wells, such as field flood studies, or to the use of sealed sources auxiliary to well-logging but not lowered into wells.