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