4 i \ (, d. No change Marginal shots sheuld be fired only under satisfactory weather conditicns that have a high degree of predictable Btability. The possibility of continuing pcstponements and perhaps of resulting extension of series duration Should be accepted, Participating organizations and units should be advised that they must accept the possibility of postponements on such shots, f, Deleted as meaningless ge No change h. Shets should be limited as follos with regard to yield and burst cititude, with maximum yield to incorporate a reasonable allowance for errors: Surface and sub-surface, 1 KT 300-foot tower, 25 KT 500-foot tower, 50 KT Air drop, 80 KT (fireball not to touch gvound) We suggest that approval of the 50KT yield for a 500-foos tower be withheld until experimental detonation at a lowex KT level has proved that the safety factor incicated here actually exists. In addition to the recommendation on the criteria given above, there are certain other general comments which we cesire to make: (1) (2) We commend the use by the Test Director cf an advisory panel which has been customary at NrG and recommend that this practice be extended to the operations in the Pacific, The Comnittee noted that the first announcement cf the recent incident in the Pacific came as @ result of the levter @ Marine wrote to his mother, The Committee considers it highly desirable that there should be an early official release of authentic information to avoid permitting unreliable and inaccurate reports te becore ecr.trolling by default. (3) Tre Advisory Committee for Biology anc Medicine rotes with apprcval the studies now being carzied out. It further urges thats: (a) all feasible empnasis tse pieced on the extension and ecceleration of the setucies on the distribution and effects of radioactive meterial from tests; (b) the Gabricl and Sunshine studies be expanded to include other elements than those now regarded as being controlling (Ru, I, Pu, for exemple). (4) The experimental evidence obtained by the staff of the Division of Biology and Medicine indicates that the biological food chains must be considered broadly and not only aleng conventional agricultural lines, The Cormittee considers of utmost inportance the provision of adequate support for extensive and intensive studies en these phases of the probien. -~O- hovendix "c"