OPERATION HARDIACK I -
DATE:
TIME:
PPG Time
30 May 1958
1415
Tobacco
Sponsor:
GMT
30 May 1958
0215
SITE:
LASL
PPG - Eniwetok - 3,000 ft
NW of Janet
179 39'
48" N
162° 13'
48"
Site elevation:
&£
Sea level
TYPE OF BURST AND PLACEMENT:
CLOUD TOP HEIGHT:
18,000 ft MSL
CLOUD BOTTOM (ISIGHT:
WM
REMARKS:
Only individual island dose rates are available.
These were abtained
from helicopter surveys made by the Radiological Safety organization at
H+l. 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 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-1-2 decay approximation was used to extrapolate the Hth hour dose
rate readings to H+l hour.
226
7
Surface burst from barge on
water