OPERATION HARDIACK I TATE:
TIME:
PPG Time
28 Jun 1958
0530
~ Redwood
GMT
27 Jun 1958
Sponsor:
1730
SITE:
UCRL
PPG - Bikini South of Fox
12° 4i'
165° 2ht
ik"
N
sk"
Site elevation:
HEIGHT OF BURST:
E
Sea level
10.79 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
water
CLOUD TOP HEIGHT:
51,000 ft MSL
CLOUD BOTTOM HEIGHT:
28,000 ft MSL
REMARKS:
Only individual island dose rates are available.
These were obtained
from Radiological Safety organization helicopter surveys at H+ 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*? decay approximation
was used to extrapolate the H+ hour dose-rate readings to H+l hour.
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