. . .::”1 ............. ...... .. .. .. .. Resuspension-factor Mass -loading approach approach . . . . . . . ..*S .. 1,000 pCi/g 600 pCi/g . . . . . . . . . . .. O.. *C.. A recent report, A Proposed Interim Standard for Plutonium LA5483-.MS, presents recommendations derived in Soils from estimates of exposure through ifialation considering soil. the concentration of 239Pu in the ~ery top surface . The following =Iues were recommended: 400 pCi/g - For all particle ZOO pCi/g in < 100/mrn sizes provided size fraction. no more than A revised Masimum Permissible Concentration, MPC, of O. 3 pCi/m3 for indi~iduals was used in these determinations. The estimates apply to large area contamination. Levels several times larger could be permitted for localized deposition. ....:... ... ...... ....—. — The Task Group recognizes that the islands of Enewetak Atoll are small and tlmt. the areas of highest 239Pu in soil on these On the other hand Lle people live islands are smaller still. It is also reco~nized that experts are not close to the soil. in agreement as to the critical organ for irihaled whether to use an average dose for this organ, or the model It is the view of the Task Group to be used to predict dose. that available biological and erivirommental information is not adequate to establish general guidance for cleanup of . plutonium. contaminated soil. Howel~er, guidance for a particular set of circumstances or conditions can be developed on -a case-by-case basis using conservative assumptions and safety factor. “The follouting guidance is recommended only for use in making decisions concerning plutonium cleanup operations on islands of Enewetak Atoll: Pluto.tium, 1. Any areas or locations where soil concentrations of are greater than 400 pCi/g should receive corrective with contaminated soil removed for disposal. III–8 ......=... ... ... ...... ........... .. ........ ....... .... .... .. .... ....... .......... 239R action