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SUMMARY
1.
Chemical separations by ion-exchange resin column and
precipitation techniques were made on selected samples
collected at the Eniwetok Test Site during the summer of 1958.
The chemically separated radioactive isotopes were identified
by determination of maximum beta energies,
gamma energies,
and
half life.
2.
The presence of wi85 and other gamma-emitting isotopes on
or in other samples from the Eniwetok Test Site and from the
nearby populated atolis of Rongelap and Ujelang was determined
by means of gamma spectrum analysis of whole samples.
3.
wi85
first observed on plankton collected approximately
150 nautical miles northwest of Eniwetok,
contributed up to
83 per cent of the total activity of the gamma-emitting isotopes in the sample.
Plankton specimens contaminated by wi85
were taken in two other general areas,
one approximately 90
nautical miles southwest of Eniwetok and another southeast of
Bikini Atoll.
Plankton taken outside these areas did not
contain radiotungsten nor was it found in any plankton samples
collected
three weeks
later in
the
same
area.