OPERATION HARDTACK I TATE:
TIME:
PPG Time
3 June 1958
O645
Rose
CMT
Sponsor:
_
2 June 1958
1845
SITE:
LASL
PPG - Eniwetok - SW of
Yvonne 4,000 ft from the
nearest edge of the island
Site elevation:
Sea level
HEIGHT OF BURST:
15.43 ft
TYPE OF BURST AND PLACEMENT:
Surface burst from barge on
water
CLOUD TOP HEIGHT:
17,000 ft MSL
CLOUD BOTTOM H&IGHT:
5,000 ft MSL
REMARKS:
Only individual island dose rates are available.
These were obtained
from helicopter surveys made by the Radiological Safety organization
at H+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-1°* decay approximation was used to extrapolete
the H+4 hour dose-rate readings to H+l hour.
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