The estinated vholeitody gamma dose to natives evacuated fron the island of Utirik following the Mareb 1, 1°54 detonation at the Pacific Proving Ground vas about 15 roentgens for «a bet no beta burns appeared. period of shout three days, It is fair t: aswsuze here that direet conten ination took place due tc their mods of living including housing that was quite open to air currents. bodies of the natives boarding the ship. Gemma dore rate readings vere taken over the at ebout H plus "© hours both on the beach and after cn the beach the personnel readings averaged about 20 wr/hr gamza (but this probably incluie! soze contribution from the ground cortaminstion , and after wading torong ship the levels averag. the surf and boarding the 7 er/hr gacca. The 1f natives on ifs Tslan4, Aflinginae Atcell, received an estie mated whole-bod; garze dose of 75 roentge:s in about two and a quarter days, Of these, 1, later experienced ciiz-t beta burns, 2, moderate burns, and none showed erilatior, In the case of the Rongela; natives, the estizated whole-body dose was about 150 roentgens in about two days fenced beta burns tc some decree 41) 64 natives later exper- froz «!‘gtt to severe anc over half of the natives showed epilatior from slictt to teevere, The 16 natives from Rongelay evaciated directly by air to Ewajslein had personnel gamma dose-rate levels gecerally 90 to 100 xwr/hr although one vas as high as .4¢ mr/hr and ore as ‘ow as 1) mr/hr (at FH plue 55 tours). about The recai:ing 48 mativer evacustec ty ship were reported to have personne] -eatiays that "averace * 4 2237S ctr before decontarination, ss 4}