OPERATION HARDIACK I -
DATE:
TIME:
PPG Time
28June 1958
0630
Elder
GMT
Sponsor:
27 June 1958
1830
LASL
SITE: PPG - Eniwetok - SW of
Janet 4,000 ft to
nearest edge of island
11° 39'
162° 13'
48"
48"
Site elevation:
HEIGHT OF BURST:
N
§£
Sea level
9.17 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
water.
CLOUD TOP HEIGHT:
50,000 ft MSL
CLOUD BOTTOM HIGHT:
NM
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-+** decay approximation was used to extrapolate the H+4 hour dose-rate readings to H+l
hour.
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