OPERATION HARDIACK I -
DATE:
TIME:
PPG Time
2 July 1958
0630
sequoia
GMT
Sponsor:
1 July 1958
1830
SITE:
LASL
PPG - Eniwetok - 4 mi
west of Yvonne
11° 32'
39"
oN
162° 21'
Site elevation:
HEIGHT OF BURST:
23"
E
Sea level
6.5 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from varge
on water
CLOUD TOP HEIGHT:
17,000 ft MSL
CLOUD BOTTOM HEIGHT:
NM
REMARKS:
Only individual island dose rates are available.
These were cbtaineda
from Radiological Safety organization helicopter surveys at 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 feet.
Readings taken at 25 feet were multiplied by a factor
of 2 in order to obtain a reasonable approximation cf 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-1}+?
decay approximation was used to extrapolate the H+4 hour dose-rate
readings to H+l hour.
274