411018 lr. Forrest Western, October 7, 1957 Assistant Director for Radiation Protection, IBM JELETED VERSION ONL Y Gordon H. Dunning, Chief, Radiation Effects of Weapons Lrench Division of Biology and Medicine r This dtcun nt OT: HARDTACK Ne —¥— ob -— G we ee Zoey ee OE Ceplos Sree 4 The following are my thoughts and understanding concerning fallout studies for Operation Hardtack: It has not been finally decided which shot will be used as the "land" shot for the progran of fallout studies recomended by AFSWP, but probably will be XS k > ZN ay & x SS As KfJf REVIE wy, BY AUTHORITY OF DOE/OC WITH DELETIONS FOR SYFSOLs LEMIREWB re Thore ig sozc clight possibility yet remaining to tag a land cl.st in es much that cn additionsl land detonation of era be fired for a foreign observers prograa. Tracer materi svilficient c.scnts could be adccd to this u_cpon, but if the prograa is carried formrard, a part of the proposal would be for other nations to tsg this t.ccron with their om tracers. If they were to do so, which thoy probably would, ow tracer experizsnt probably would not succeed. Thsre ceoens little likelihood at this tima that an additional shot could be added to Hardteck for the sols purpose of fallout stucies. ‘The other consideration that heve been in the mill were to tag the : pretrp | RG____cowmicsio ~ y a Collection£ 7 ) TRox RVCZ JOPV3 4 : PolderHattee fT - OLSe. y= 7 BEST COPY AVAILABLE DOE US DOE ARCHIVES 326 US ATOMIC ENERGY TON CLASSIFICATION CANCELLED TUDIES UT F t= 1s ryyo 5 oS

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