OPERATION HARDTACK I -
DATE:
TIME:
PPG Time
Olive
GMT
23 July 1998
Sponsor:
22 July 1956
0830
2030
SITE:
UCRL
PPG - Eniwetok - SW of
Janet, 4,000 ft from
the nearest edge of
island (Sta. 1312)
11° 39' 48" N
162° 13' 48" &£
Site elevation:
HEIGHT OF BURST:
CLOUD TOP HEIGHT:
50,000 ft MSL
CLOUD BOTTOM HEIGHT:
Sea
level
6.0 ft
TYPE OF BURST AND PLACEMENT:
16,000 ft MSL
Surface burst
on water
from barge
REMARKS:
Only individual dose rates are available.
These were obtained
from Radiological Safety orgnization nelicopter 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 reet.
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+ hour dose-rate readings to H+l hour.
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