OPERATION HARDIACK I -
TATE:
TIME:
——
PPG Time
29 June 1958
0730
Oak
GMT
Sponsor:
28 June 1958
1930
LASL
SITE: PPG - Eniwetok - 3 mi
SW of Alice
TOTALYIELD: 8,9 Mt
11° 36'
28"
162° 06' 28"
Site elevation:
FIREBALL DATA:
Time to lst minimum:
Time to 2nd maximum:
Radius at 2nd maximum:
CRATER DATA:
Diameter:
Depth:
Water depth:
NM
2.98 sec
HEIGHT OF BURST:
NM
N
§
Sea level
13 ft
6.5 ft
TYPE OF BURST AND FLACEMENT:
Surface burst from varge on
4,400 ft
183 ft
water
CLOUD TOP HEIGHT:
78,000 ft MSL
CLOUD BOTTOM HEIGHT:
iM
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 a desired spot, sco 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-l:? decay approximation was
used to extrapolate the H+4 hour dose-rate readings to H+l hour.
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