OPERATION HARDTACK I -
TATE:
TIME:
PPG Time
Walnut
CMT
Sponsor:
15 Jun 1958 1h Jun 1958
0630
1830
SITE:
LASL
PPG - Eniwetok - 5,000 ft
OW of Janet
11° 39'
162° 13’
37"
31"
Site elevation:
HEIGHT OF BURST:
N
&
Sea level
7.21 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge
CLOUD TOP HEIGHT:
61,000 #t MSL
CLOUD BOTTOM HEIGHT:
NM
on water
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 cc:ld 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 t7°*
decay approximation was used to extrapolate the H+4 hour dose-rate
readings to H+l hour.
250