~ TABLE Il Existing Exposure Guidelines for Non-Occupational Exposure that Apply to Pu-239 in Insoluble Form* Individual Population Averade MPLD 1.5 (0.5) rem/yr 0.5 (0.17) rem/yr MPLB 0.0016 (0.0005) uCi 0.0005 (0.00017) uci MPC, 10722 (3x10713) uci/ml 3x10723 (10723) uciymi (ICRP, NCRP, FRC) ** (ICRP, AEC) “* he MPLD values in parentheses refer to the latest . recommendations of the NCRP. The MPLB and MPCga values in “~parentheses correspond to the new NCRP dose recommendations. IV. Calculating the Dose Due to Insoluble Alpha-Emitters The purpose of this section is to examine the assumptions in the radiation standards above that are inappropriate when - _~_—_ applied to insoluble alpha-emitting particulates such as - ‘aerosols of Pu09. The assumptions are introduced through a — review of basic definitions of radiation dose and the factors used to calculate the dose, A, The Dose Eculivalent When an X-ray or the radiation emitted by a radionuclide “passes through tissue it transfers energy to the cells in