ee a Rwieas . FoF” NORFOLK NAVAL SHIPYARD PORTSMOUTH, VA. bey In reply refer to ¥8/8570(271) (BARDTACK) > 029 yan 17188 From: Tor Commander Commander, Task Force 7 Subj: Operation HARDTACK; request for change in radiation dosage limit Ref: (a) (b) Encl: (1) WNavShipYdNorVa conf ltr FS/S11(274h) HARDTACK of 5 Dec 1957 to Chief, BuMed, info copy to Hdgtrs NC AFSWP BuMed conf ltr BUMED-742:CCBrces Ser 01116 of 13 Dec 1957 to NavShipYdNorVa Copy of reference (b) 1. It is understood that the radiation dosage limit for personnel while 2. Underwater Explosions Research Division Project 3.4 plans for personnel stationed at EPG during Operation HARDTACK will be established as 3r. to go aboard the target ships as soon as possible after WAHOO in order to effect repairs, recalibrate equipment and make preparations for UMBRELIA. 3. In anticipation of the relatively early re-entry needed by Project 3.4 after WAHOO and the extended work requ ted aboard the target ships between WAHOO and UMBRELLA, it is most desirable that the radiation dosage limit for Project 3.4 personnel be raised to 4r. 4. It should be noted that no personnel involved in Project 3.4 has ever participated in an atomic test before and that the earliest possible participation after WAHOO and UMBRELLA tests will be in 1960. It should further be noted that every effort will be made to keep personnel exposure as low as possible. 5. The Burem of Medicine and Surgery was approached by reference (a) with respect to this change in the radiation dosage limit and has no objection to this increase (reference (b)). 6. It is therefore requested that the radiation dosage limit for Project 3.4 personnel be raised to ér. BEST AVAILABLE COPY Copies to: HQ, FC, APSWP (with copy of enclosure) Dr. W. W. Murray, Project Officer, Project 3.4 / TJ. SULLIVAN, Jr. By direction 3