“UNCLASSIFIED _ At H=plus 3 hours two monitors boarded the Tank LOM as it came by the BAIROKO and proceeded to the zero island to await Dr. Bowman who was to fly to the island by helicopter after supervising the removal of filters from the drone planes at Eniwetok. Dr. Bowman arrived at 1050, and flags were placed at the center of the causeway marking the limit of tae safety for the tank controlling helicopter, The helicopter in which the tank operator, was riding was forced down by engine trouble on another eae ASS At 1130 the operation was ready, The tank that had been stationed in the revetment during the test was driven manually to the causeway, and from ee the test weapon. ees island, and caused some delay before he could be flown in for the operation. 2ee thence proceeded under remote control operation to the crater formed by “Sh: The tank soon became bogged down, and efforts to get it started again were unavailing, The reserve tank that had been brought up a in the ICM was then sent in and successfully obtained a soil sample from be the desired point, returning to the uncontaminated end of the island. Be. This soil sample was divided, a small portion being sent to the laboratories ve on the USS BAIROKO, and the remainder being taken to Eniwetok by one of the oe monitors. Soe a During this entire operation a standby helicopter with a monitor teok up a position near the tank controlling helicopter, in order to insure wait helicopter checked most of the island at an altitude of 500 feet, except a This latter sample reached Eniwetok by 1510 and was dispatched by air to laboratories in the United States. ae fh that the latter would not be overexposed to radioactivity. When this plane landed to investigate the trouble with the tank, the monitor in the other oe that portion in the vicinity of the zero point. lg ‘ 5 ih. The evaporators on the BATROKO and on the MT MCKINLEY were checked eh for radioactivity and found satisfactory. 8s YOKE Plus Two Day - The northeast perimeter survey of the islands left the BAIROKO at “ey 0930 in two dukws, 3 ot Extensive evidence of fall-out was found on all the islands of this section. A detailed survey was impracticable within the restrictions of a routine mission, and readings had to be taken while a are moving rapidly along the beaches in the dulws. Only half of the islands planned for survey could be covered before tolerance doses had been Mae complete fall-out report was prepared. we i received by all personnel. Some evidence of water contamination was observed, and all results were reported in detail to Radops where a av a : s, a ba Be | ' _ At about 1000 hours the background on the flight deck and hanger deck of the USS BAIRDKO began to noticeably increase, and it shortly became evident that appreciable fall-out was cccuring on the ship. . About the same time, it was reported that fall-out had occured on Kwajalein, : and steps were taken to fly water samples to t..e laboratories on the © MATROKO for study, The maxjmum reading recorded on the BAIROKO was 1,7 or/br, Hourly samples of filter papers from the dust cellectors were taken. . 5001923 7 | -7is Hwy aqa ,