COPY DEPARTMENT OF THE NAVY BURRAU OF MEDICINE AND SURGERY WASHINGTON 25, D. C. BUMED-742:GCB:ces Serial: $1116 13 DEC 1957 CONFIDENTIAL From: To; Chief, Bureau of Medicine and Surgery Commander, Norfolk Naval Shipyard Portsmouth, Virginia Subj: Operation HARDTACK - radiation dosage limits for personnel; Ref: (a) comment concerning Norfolk NavShipYd ltr FS/S11(274A) (HARDTACK) Ser 0635 of 5 Dec 1957 1. The Bureau of Medicine and Surgery has no objection to the increase in radiation dose for personnel in Project 3.4, Operation HARDTACK, from 3r/13-week period to 4r/l13-week period. This proposed increase is in accordance with a revision of National Bureau of Standards Handbook 59, entitled "Permissible Dose for External Sources of Ionizing Radiation." However, it must be emphasized that the Bureau of Medicine and Surgery desires that personnel exposure be kept as low as possible, even at the expense of an early entry into the target area. 2. It is requested that the Commander, Norfolk Naval Shipyard, direct this request to the Commander, TF-7, as a policy matter coming under that Commander's cognizance. /s/ . F. Dickens, Jr. - By direction BEST AVAIL SOs oH RPE ” Sey Pee Vehe a LT Mi ue bee Pee Se Enclosure (1) a