OPERATION HARDTACK I -
TATE:
TIME:
26 May 1958
1400
Yellowwood
Sponsor:
26 May 1958
0200
SITE:
LASL
PPG - Eniwetok - SW of
Janet 5,000 ft
11° 39'
162° 13'
37" N
31"
&8
Site elevation:
Sea level
Water depth:
75 ft
HEIGHT OF BURST:
10.52 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on water
CLOUD TOP HEIGHT:
50,000 ft MSL
CLOUD BOTTOM ERTGHT:
30,0CO ft MSL
REMARKS:
Only individual island dose rates are available.
These were obtained
from Radiological Safety organization helicopter surveys 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 €5 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-l°? decay approximation was used to extrapclate the H+4 hour dose-rate readings to H+l
hour.
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