The rafts consisted of alabs of styrofoam approximately 5' x 5' x 4" fitted
with small radio homing transmitters and ballooneelovated transmitting
antennas,
The rafts were cropped from transport aircraft starring several
hours before shot time,
wero,
The area covered was a 90° sector centered on ground
The orientation of the sector was determinec om the basis of the latest
forecast winds and forccast fallevat sone,
Post-shot, two survey aircraft
with large, highly sensitive scintillation-type counters were used ts locate
the rafts and measure the intensities sf the ecntamination expected to be
trapped in the porous styrcfoam.
although Locetion of the rafts prcved to be
the major operational problem (very few were found), the chief cause of failur
of the project was due ts the fact that intensities on the rafts were act
appreciably different from the intcnsitics read ower the water near the rafts,
Sortunately, however, failure of the raft program for tha latter rezson point=
ed the way toward a simpler and more practical methed of measuring the dcwnwind fall-out, namely, the use of lowelecwel aireraft flights to execute a
grid-pattern survey cover the fall-out area taking readings of the intensity of
the water itself.
On the basis of the rclatively sketchy results from Y.NKEE,
the KiSL group set up amd exccutod a reasonably succossful aerial water survey
project for the last shot, NECTAR.
(Note:
CASTLE Project 2.58, having lost
thebulk of their open sea dan buoy fall-out collectors duc to operational
recovery problems and shot delays, also attacked the fall-out problem in a
similar fashion.
In general, the 2.5a plan on the last two CaSTLE shots
consisted of gathering water samples from varicus depths to determine redistion intensities and the waricus parameters affecting the mixing properties
of the ocean and the taking of vertical radiation profiles by means of trollin
& submerged radiac instrument.)
The results of the HiSL NYKOFO effort anc the
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