- 34 - — As seen from Table IV, using Geesaman's lung model, a particle with an alpha activity between 0.02 pCi and 0.14 pCi is recuirai to give a dose of 1000 rem/yr to irradiated lung tissue. For purposes of establishing a maximum permissible lung particie burden we will use 0.07 pCi lived (greater than one year) from long haltf- isotopes as the limiting aloha activity to qualizy as a hot particle. Thus, throughout the remaincer of this resort, hot particle will imply a particle with at least this limitins aloha activity which is insoluble A, mipesures at Rooxy Fiats Dne SED nas a plutonium facility associated with its mutheaer waarcns orogram at Rocky 2 s Flats, ’ Colorado. This Facilizcy is cserated under contract to the A=C by the Dow Cnémical Iscranv. The emplovees, the anvironment and uncousteci_ the surrouncing population nave been contaminated with olutoniuz . carticieas rt a2 is, zs 2 , tnerticre, Marn, l.0. - result of at . oertinent nere and A.B. - the speration of to examine Fircnanev, Oo. ou *5is the plant. 60-52 information cit. oi Pear, 2.2. ana 2.4. Martall, “Pluconiunm-239 and Dmeériciumelsl in tha ocenver Area," Healcn Favsics, Vol. 1372, co. 32°-349. 23,