OPERATION HARDIACK I -
DATE:
TIME:
PPG Time
21 May 1958
0630
Holly
GMT
Sponsor:
20 May 1998
1830
LASL
SITE: | PPG - Eniwetok - West
of Yvonne, 4,000 f*
from the nearest edge
of the island
11° 32'
38"
WN
1620 21'
22"
Site elevation:
HEIGHT OF BURST:
§
Sea level
13.06 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
water
Water depth:
4O ft
CLOUD TOP HEIGHT:
15,000 ft MSL
CLOUD BOTTOM HEiGHT:
7,000 ft MSL
REMARKS:
Only individual island dose rates are available.
These were obtained
from helicopter surveys made by the Radiological Safety organization
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 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 H+ hour dose
rate readings to H+1 hour.
210