International Commission on Radiological Protection. Abbreviation for meter. micron: One-millionth of a meter. ml Milliliter = 0.001 MPC: Maximum permissible concentration (of a radionuclide) in air. The average concentration above bacxground of a specific radionuclide to which an individual can be exposed without exceeding the guidelines. MPCw : liters. Maximum permissible concentrration (of a radicnuclide) in wa ter. (See definition above.) MD L3: ele Maximum vermissible lung burden. MPLD: Maximum permissible lung dose. National Council on and Measurements. tion for narocurie, which is oneof a curie, or 1079 curiae. - Abbreviation for nicocurie, which is one. : . . . ~19? . millionth of a micrecurie, or 10712 curies. Factor, whicn is @€ number of confactor is a in calculation of ferences Rad