AS secn a from Table IV, using Geesaman's lunj model, a ~ particle with an alpha activity between 0.02 pCi and 0.14 pCi is required to give a dose of 1000 rem/yr to irradiated lung tissue. For purposes of establishing a maximum permissible lung particle burden we will use 0.07 pCi from long halflived (greater than one year) isotopes as the limiting alpha activity to qualify as a hot particle. Thus, throughout the remainder of this report, hot particle will imply a particle with at least this limiting alpha activity which is insoluble in lung tissue. A | Exposures at Rocky Flats The AEC has a plutonium facility associated with its a nuclear wearons vorogram at Rocky Flats, Colorado. This facility is operated under contract to the AEC by the Dow Chemical Company. The employees, the environment and undoubtedly the surrceunaing ponslaticn have been contaminated with pliatonium oo ; ; particles as a result of the operation of this plant. 60-62 , . It is, therefore, pertinent here to examine the information 60/ Mann, J.R. and A.R. Kirchnev, Op. cit. 61/ Poet, S.E. and E.A. Martell, "Plutonium-239 and Americium-241 in the Denver Area," Health Physics, Vol. 1972, pp. 537-549. 23, 62/ Richmond, Chet, Transcript of Plutonium Information Meeting of the Advisory Committee on Reactor Safeguards, Los Alamos, N. Mex., 5 January 1974, pp. 319-320. “ eek Tam . : apa ys * ere aee ea Bo2 te Se PAL mt BB EN PPV Uy oe eet t meat as bet meen" = my , as OP, eRe. “ ie wetx Sa ~yaa me Tek ee Tt . . oy SMR 2, et pe 7 / . , ‘ ‘ 4