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Butternut
OPERATION HARDTIACK I -
TATE:
TIME:
~~
PPG Time
12 May 1958
0615
GMT
Sponsor:
11 May 1953
SITE:
1815
LASL
PPG - Eniwetok - SW of
Yvonne
4,000 ft from the nearest
edge of the island
119 20'
162 21'
i"
O02"
Site elevation:
HEIGHT OF BURST:
N
&
Sea level
10.13 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
water
Water depth:
65 ft
CLOUD TOP HEIGHT:
35,000 ft MSL
CLOUD BOTTOM HEsIGHT:
NM
REMARKS:
Only individual island dose rates are available.
These were obtained
from helicopter surveys at H+4 hours made by the Radiological Safety
Organization.
The helicopter survey technique called for the pilot
either to land the aircraft at the desired spot, so that a ground reading
coula 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.
Thet--? decay
approximation was used to extrapolate the H+ hour dose-rate readings
to H+1 hour.
197