TIME:
PPG Time
22 May 1953
0920
GMT
21 May 1958
Sponsor:
2120
SITE:
UCRL
PPG - Bikini - West end Tare
119° 29'
165° 22'
6"
15"
Site elevation:
HEIGHT OF BURST:
N
&E
Sea level
12.11 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
water
CLOUD TOP HEIGHT:
20,000 ft MSL
CLOUD BOTTOM HEIGHT:
IM
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-2°2 decay approximation was used to correct the H+4 hour doserate readings to H+l hour.
214
ore
DATE:
Nutmeg
——w
OPERATION HARDTACK I -