The estimated whole-body gamma dose to natives evacuated from the island of Utirik following the March 1, 1954 detonation at the Pacific Proving Ground was about 15 roentgens for a period of about three days, but no beta burns appeared. It is fair to assume here that direct contan- ination took place due to their mode of living including housing that. was quite open to air currents. Gamma dose rate readings were taken over the bodies of the natives at about H # 78 hours both on the beach and after boarding the ship. On the beach the personnel readings averaged about 20 mr/hr gamma (but this probably included some contribution from the ground contamination), and after wading through the surf and board- ing the ship the levels averaged 7 mr/hr gamma. The 18 natives on Sifo Island, Ailinginae Atoll, received an estimated whole-body gemma dose of 75 roentgens in about two and a quarter days. Of these, 14 later experienced slight beta burns, 2, moderate burns, and none showed epilation. In the case of the Rongelap natives, the estimated whole-body dose was about 170 roentgens in about two days. All 64 natives later exper- ienced beta burns to some degree from slight to severe and over half of the natives showed epilation from slight to severe. The 16 natives from Rongelap evacuated directly by air to Kwajalein had personnel gamma dose-rate levels generally 80 to 100 mr/hr although one was as high as 240 mr/hr and one as low as 10 mr/hr (at H x about 55 hours). The remaining 48 natives evacuated by ship were reported to have personnel readings that "averaged" 60 mr/hr before decontamination. The picture is further confused because some of the natives had bathed and some had not before the arrival of the evacuation tean. - 23 -