rise slowly.
A peak intensity of 2.5 mr/hr was reached at 2130 hours, and
then subsided.
5,4
3 July 1958 Fallout
On 3 July 1958, following an event at Bikini Atoll, the background at Site
Nan began to rise after a rainshower at 1500 hours, The background rose from
4mr/hr at 1500 hours to 12 mr/hr at 1645 hours, and then began to decline, as
follows:
0300 hours July4......
1200 hours July4...
1000 hours July5..
5.5
.
. 5 mr/hr
... . 3mr/hr
tons
1 mr/hr
13 July 1958 Fallout
On 13 July 1958 a slight rise in the background and the continuous air
monitor was noticed at 0030 hours at Eniwetok Atoll.
The background monitor
reached a high of 1.8 mr/hr and the air monitor showed 20, 000 c/m at 0345
hours and then declined to 1.5 mr/hr and 2000 c/m at 0630 hours,
5.6
18 July 1958 Fallout
At 1420 hours,
18 July 1958, the background monitor at the Site Elmer
Rad-Safe Center began to rise sharply.
At 1430 hours the background had
risen to 20 mr/hr and reached a peak intensity of 34 mr/hr at 1449 hours.
The increase in background was noticed shortly after rain began to fall,
An-
other rain squall started at 1452 hours and the background intensity dropped
sharply and continued to decrease to 0.3 mr/hr at 1630 hours.
A survey of Site Elmer showed intensities up to 4 mr/hr at 1530 hours,
The tent areas showed readings of 3 mr/hr and the interiors of the tents showed
23