Elution procedure
. The sample was allowed to pass through the column at a
rate of 0.2 - 0 5 ml per minute and then the column was washed
with 50 ml of O.2N HCl.
The HCl fractions,
ions not adsorbed to the resin,
fractions.
which contained
are designated as the anion
The cations adsorbed to the resin were removed
progressively by passing through the column 50 ml of 0.5 per
cent oxalic acid followed by 5 per cent citric acid solutions
adjusted to pH 3.5, 4.1, 4.6, 5.1, 5.6 and 6,1 with NH,OH.
The eluates were collected in ‘test tubes and dried for
gamma counting.
Aliquots were removed for beta counting.
The
resin bed was removed from the column at the termination of
the elution procedure and was ignited.
The ash was counted
for beta and gamma activity
The disintegration rates for the individual isotopes were
determined from the beta and gamma counts.
Gamma survey procedure
After the isotope wr85 was identified in the plankton
samples,
gamma spectra were made from different types of samples
collected in and around the Eniwetok Test Site during the in-
terval April 28 to September 17, 1958.
The radiotungsten was
identified by the 0.055 MEV gamma peak and the disintegration
rates of this isotope as well as those of the other gamma