k .A : NER AY 9 | ae Inasmuch as some natives of Rongelap vere reported to be on alinginae, tne atoli was surveyed, 17 natives locatea, and an intensity oN am, of 445 mryar was found, Evacuation was complete by 1800, 3 Varch. The ose computea for this group is @0r and det2ils are eppended. aerial survey of Utirik by aSLo Fattem indicated 620 mr/hr at 1651 ors, 2 Uarch (later re-calibrated to 240 mr/hr). (Om 3 Larch 1245 ground survey indicated 160 mr/nr. Decision to evacuate based upon fact that estimated dose at time of earliest evacuation would be 13r. Evacu- ation complete 1245 hrs, 4 Larch. Estimate of dose to actual evacuation time was l7r. 154 natives were evacuated. Calculations appended in the medical tab. The only other populated atoll which received fallout of any conSequence at all was Ailuk. ASLE Fatterr, indicated 95 mr per hour at 1845 hrs, 2 March. EBased upon the best estimate of faliout tine it was calevlated that a dose to infinite time woulc reach approxizately 20 soentgans. CSalaccing the effort required to move the 400 inhabitants against the fact that such a dose would not be a cedical problem it was decided not to evacuate the atoll. Indications from zerial surveys indicated substantial fallout occurred on the unpopulated isiands of Eikar and Taka. Very minor faliout oceurred in 2 southvesterly and westerly direction on Eniwetok and Cjelang atolls but levels did not exceed 1Gmr per hour at Eniwetok nor 3=r per hour at Ujelang. This was apparently very fine particuiate matter carriea by the low trade wind component. 4 detziled plen was made to mace ground surveys of all islands which had fellout in excess of lQer per hour at estimated fallout time to pro- vide information as to decay rate and verification of estimation of caoses. Water and soil samples from these surveys were shipped by air to HASL, kY Operations Office, Attention: Mr. Merril Eisenbud, for detailed anaiysis. Qarue BR, #. HOUSE Lt Colonel, USAF a Cn. Tech. Br., J-3