and telephonic nets when available. During each recovery or work phase, the monitor constantly kept track of the accumulating dosage with pocket dosimeters and through calculations, using the readings obtained on the AN/PDR-T1B. Someof the results of aerial and ground surveys are shown in Table 3.1. The ground values given in the table are indicated by daggers, and, unless otherwise stated, the aerial values are from an altitude of 25 ft. Table 3.1— RADIATION LEVELS, FROM AERIAL AND GROUND SURVEYS, IN MILLIROENTGENS PER HOUR Runit M-day 5-5,000 at 1,200 ft (Max)t M+3 40-120f M+t8 12-16 M+14 0-40f K-day 0-3,800 (3,800 over north end; Biijiri None recorded; 8,000 over Engebi Teiteir 50,000 at None 500 ft Piiraat recorded; 10,000 Ruchi None recorded Bogallua 7,000 at 1,500 ft at 500 ft over Bogon 2,000T 3,300 8,000f 400T 1,400 2,500T 3,400 8,000T 1,300 2,500T 1,300 2,800T 130 18,000 10,000 on lagoon reef 9,000 10,000 26,000 on lagoon reef off Cochiti 270t 1,400 600 1,900 800 850 120 480 2,400 400 750 70 150f 430 900T 1,600 420 440 200T * 3-5 south of airstrip)t K+1 1.0 1.0t South 10 Center 100 (a) Ujelang Evacuation, This evacuation was accomplished utilizing the LST 827, commencing on 27 October 1952, and re-entry was accomplished on 2 November 1952. TU 7 loaned personnel to CINCPAC to ensurethat all necessary radiological-safety precautions were taken. The evacuation was carried out in a successful manner, and no radiological hazards were encountered. (o) Horizon Radiological Safety. Radex had shown the possibility of the Horizon being subjected to somefall-out. The data which this vessel was to collect were essential, and the vessel had to be “on station.” The radiological-safety-responsible agency was TG 132.3. The interest of TU 7 in the operation lay in the furnishing of radiological-safety personnel and equipment to accomplishthe radiological-safety activities. This craft, which had been 72 miles north northeast of zero, reported contact with the fall-out area. Within 20 min after the 41