OPERATION HARDTACK I ~-
DATE:
TIME:
PPG Time
27 July 1958
©6830
Pine
GMT
Sponsor:
206 July 19.8
2030
SITE:
UCRL
PPG - Eniwetok - SW of
Janet, 8,000 ft to
nearest edre or island
"
a
11° 39!
ce
N
162° 13'
11"
Site elevition:
HEIGHT OF BURST:
CLOUD HEIGHT:
&E
Sea
level
€&.0 ft
TYPE OF BURGT AND FLACEMENT:
Surfuce burst Yrom barge
on water
Not available
REMARKS:
Only individual island dose rates are available.
These were obtained
from the Radiological Safety orginization helicopter surveys at
H+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 fret.
Readings taken at 25 reet were
multiplied by a factor of 2 in order to obtain a reasonable
approximation or the true vround reading.
The basic instrument
used in the aerial surveys was the AN/TDR-39 survey meter modified
to read up to 500 r/hr.
The t-+** decay approximation was used
to extrapolate the Ht hour dose-rate readings to H4l hour.
303