OPERATION HARDIACK I -
DATE:
TIME:
PPG Time
Hickory
GMT
Sponsor:
29 June 1958 29 June 1958
1200
2400
SITE:
UCRL
PPG - Bikini - Off west
end of Tare
11° 29'
165° 22'
46"
15"
Site elevation:
HEIGHT OF BURST:
CLOUD TOP HEIGHT:
Sea level
12.11 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
2,000 ft MSL
CLOUD BOTTOM HEIGHT:
N
E
water
12,000 ft MSL
CRATER TATA:
Not available
REMARKS:
Only individual island dose rates are available.
These were obtained
from helicopter surveys made by the Radiological Safety organization 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 reasonaole 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+4 hour dose-rate readings to H+l hour.
270