OPERATION HARDIACK I -
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TATE:
TIME:
PPG Time
Dogwood
GMT
6 July 1958
0630
Sponsor:
5 July 1956
1830
SITE:
UCRL
PPG - Eniwetok - SW of
Janet 4,000 ft to nearest
edge of island (Sta. 1312)
12° 39!
162° 13'
HEIGHT OF BURST:
48"
48"
N
&E
12.25 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge
CLOUD TOP HEIGHT:
58,000 ft MSL
CLOUD BOTTOM HSIGHT:
on water
25,000 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+4 hour doserate readings to H+l hour.
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