COR “ UNIVERSITY OF CALIFORNIA LOS ALAMOS SCIENTIFIC LABOFATORY F.0O. Box 1663 .S ALAMOS, NE” MEXICO CLASSIFICATION CANCELLED WITH DELETIONS 8 Wey 1952” ONLY BY AUTHO mal DOE/@C, 101449 Seach 7/23 7 Sia asia DELETED VERSIO N Mr. Carroll L, Tyler Maneper, Sante Fe Cperztions Office Albuouerque, New Mexico BEST AVA LA RLE co Dear Mr. Tyler: The best estimates which can te mere at present with respect to the use of the Sniwetol Proving Ground following Operetion Ivy are given below in reply to your reauest of April 25, 1952, reference T-6, These estimetes cennot be considered firm at this time anc are subject to very consicer-ble change cependins upon the results of Ivy anc further theoretical an« developmental work. 1, ; c.-\\ As stated in my letter to General Fields of April 16, 1952, of which you have a copy, the best estimate of the dete for the first Eniwetok operation following Ivy is SeptemberOctober, 1953. Svrecificaltly, it is thought likely th=t the testing phase of the operetion would reouire 2bout three nonths during the last four months of calendar year 1952, 2. Present plens envisage a totel of 3 + 1 tower or ground » PHLE ED "Y \ N" ‘| Xt Ni x iw x) = K less cemaging than presently enticipsted. The other shots being considered are sufficiently gma) thet evecuetion of the Atoll may be unnecessary, yet too large to shoot on towers on the surfece in Neveda op These,tests will be encillsryi “ magnitude and complexity of that for the Greenhouse George : $ 4n Ivy thet the effects from large-yiel¢ detonetions are N A &2° will require extensive instrumentation of the QR S cM) L. It would not be safe to assume thatthe need not be evacuated for this shot unless we learn 5 = Ce £ | test. eneniin Mb —_ COMMISSION 326 U.SaRObENERGY -—~ shots, no crop tests.