27 i - there is picxup of the vadioactive faiiout chrough the ‘cootc. nat may be the cituation, however, is tnat thi, pickup iv not neacly so serious as we have been suppocing and a good paré of the pickup we nave observed has cowe fron che ieaves. If the iatter is true ther ii a period of minimum fallout, the milx Level and tue vezetavble level wil’ fail correspondingly to a value Lomewnat cioserc to the amount that would come sole:y from the root piciup, and we wouid expect, therefore, tnat the steady state corcentyatiorn in cue numan body of the faliove icotopes would be coisicezavly iowexr than we nave beer calculating im tne past. Tt isc not csear at tii. time ae to waether thic conelusion i. justified uit furthers ouve.vatioiu anc ctuday wilt make it cleay anda we chou_i ve asert tu tue H importance and Lixeliboeod of thic -evelto,ment. IV. CorCLuctoi Tne futuve cuuv.e of the Calicut znvecti.ation io weir cet and ie now proceeding or an inteviatioral secaie so that without doubt within the foreseeasle fucule cne major question. about cne falLicue mechanicm will te av.cweced. 2emainin,, however, wiil ve the tremeidouse problem. of tne biological coi..equences or fallout vadiation. ic o nece to cornsiuez these. It i, we shali make mo attempt howevew ar avea of uncertainty £0 Large that ouly che most conse.vative treatment of tne DO® ARCHIVES

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