( UNITED STATES ATOMIC ENERGY COMM SION WASHINGTON 25, D.C. AuG 9 7ic5T 410267 MEMORANDUM FOR: SUBJECT: Dr. W. F. Libby Radiation Levels on Rongelap Island In our Staff Paper AEC 125/30, deted Februery 6, 1957, concerning the return of the Rongelapese to their home island, we predicted " ..eeit is difficult to extrepolate precisely far into the fu- ture, but the data suggest that the gamma doses on Rongelap Is- land would not greatly exceed (if at all) 0.5 roentgens for the first year of reoccupancy, with lesser doses in subsequent years..." On June 25, 1957, just prior to the actual return of the Rongelapese, & radiological survey was made of the gamma levels on Rongelap Island. ‘wWhese data were attached in the form of a memorandum with accompanying maps from Mr. Ernest Wynkoop to Dr. Gordon M. Dunning. You will note that the average gema dose rate on the Island on June 25, 1957, was ebout 0.03 milliroentgens per hour (0.26 roentgens per year). Since you Leve exhibited a manifest interest in this matter, the enclosed ere forwarded for your informstion. BEST COPY AVAILABLE LP Pfs ‘ . —4t <Q General Maeneacer ee wee (7) Enclosures: Nero sy TST,soe fron EWynkoop, we ata 6/27/57, subj: Gamma Radio- logical Survey of Rongelep end fnszztok gotends 1.208 (6) awn f .? , LY P.G__ US COB SECM te UPON PYEPC 326 US ATOMIC ENERGY ___COMAMUSSION.__- —— Colcetion FORM ERCOMM LIBSY 9 z 1— Box rotder RengobepA FAP os Department sof OfEncray fcs \ Historian’ ARCHIVES STATUS JYERUTED L/A/C COC BY ae _for44a, DATE 3) [£2