OPERATION HARDIACK I PPG Time
Aspen
GMT
TATE:
15 June 1958
14 June 1958
TIME:
0530
1730
Sponsor:
SITE:
UCRL
PPG - Bikini - SW of
Charlie 4,000 ft from
the island
119 hit
165° 16'
27"
ak"
Site elevation:
HEIGHT OF BURST:
CLOUD TOP HEIGHT:
Sea level
10.82 ft
TYPE OF BURST AND PLACEMENT:
48,600 ft
CLOUD BOTTOM HEIGHT:
N
&
Surface burst from barge on
NM
water
REMARKS:
Only individual island dose rates are available.
These were obtained
from Radiological Safety organization helicopter surveys at H+4 hours.
The helicopter survey technique called for the pilot either to land
the aircraft at the desired spot, so that a ground reading could be
obtained, or to make a slow pass over the desired spot at an elevation
of 25 feet.
Readings taken at 25 feet were multiplied by a factor
of 2 in order to obtain a reasonable approximation of the true ground
reading.
The basic instrument used in the aerial surveys was the
AN/PDR-39 survey meter modified to read up to 500 r/hr.
The t-1:2
decay approximation was used to extrapolate the H+4 hour dose rate
readings to Htl hour.
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