-1C-
ir. the HCl and H,S9, fractions.
zr95_np?5 was not eluted with any
of the agents used, and it, along with traces of Spl2s , was found in
the resin at the end of the experiment.
The oxalic acid fraction, which
according to the method of Smith and Reynolds i 8 should contain Sb!25_
was analyzed in a gamma spectrometer for the presence of Sb
125
Figure 3a shows the gamma spectrum for the fraction and demonstrates
the presence of strong peaks at energies of 0.17 Mev, 0.43 Mev,
0.61 Mev.
Lazar
12
and
The peaks are in agreement with those of Sb125 as given by
.
both as to energy and relative intensity.
Confirmation of the presence of S pl2s in a portion of the anion
fraction was obtained by the use of standard radiochemical precipitation
procedures.
The gamma spectrum of the resulting Sb2S, precipitate
from the procedure is given in Figure 3b.
The relative intensity and
energy of the peaks corresponded to those obtained with the 0.1M
oxalic acid fraction from the anion-exchange separation.
Oxalic Acid Fraction from the Dowex 50 Separation
When a One-milliliter aliquot of the oxalic acid fraction from the
Dowex 50 separation was plated, flamed, and counted in a methane gas-
flow chamber with and without a 4.7 mg/cm“ 2 aluminum absorber,
count in the
sample was reduced from 314 c/m to 41 ¢/m.
This
the
re-
duction in count indicated that the major portion of the radioactivity was
of low energy and suggested the presence of Fe 55
contaminated with