Pd
ASPEN EVENT
OPERATION HARDRACK
1,
The ASPEN device was detonated on a barge 3,000 feet southwest of
Charlie Island, Bikini Atoll, at 0530M, 15 Jyns 19058,
Radar establishad
the cloud height at 48,600 feet; aircraft estinated the top at 55,C00 feet.
Within thirty minutes the cloud had moved well to the northwest of the lagoon.
2,
A P2V airoraft (Wiidroot 11) reported over Nan at H+30 minutes, and
it was vectored scross the eastern asction of the lagoon.
readings were recorded.
Only background
At 0645M, the P2V had searched the entire l:goon,
and the highest reading was made two miles sast of ground gsro:
5.5 ar/br.
Re-entry hour was declared at O7COMe
3,
Tyo helicopters took off from Nan at 0730M, and negative readings
were reported at William and How,
A second detailed survay was conducted
at H+7 hours,
4,
Fallout was predicted along a true bearing of 300 degrees for 4
distance of 200 miles.
It is estimated that all fallout fell within this
area ,
5,
Excellent communications with the USS Benner contributed to the
succass of this event.
.
my act
TAB A
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1497