OPERATION HARDIACK I -
TATE:
TIME:
PPG Time
18 Jun 1958
1500
Linden
GMT
Sponsor:
18 Jun 1958
0300
SITE:
LASL
PPG - Eniwetok - West of
Yvonne, 4,000 ft from
the island
11° 32’
162° 21'
39"
23"
Site elevation:
Water depth:
HEIGHT OF BURST:
WN
E
Sea level
33 Ft
8.25 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
water
CLOUD TOP HEIGHT:
20,000 ft MSL
CLOUD BOTTOM HEIGHT:
WM
REMARKS:
Only individual island dose rates are available.
These were obtained
from helicopter surveys made by the Radiological Safety organization
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> 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-+:®
decay approximation was used to extrapolate
the H+ hour dose-rate readings to H+l hour.
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