-10-
in the HC] and H,SO, fractions.
Zr?°-Nb?? was not eluted with any
of the agents used, and it, along with traces of Sp125, was found in
the resin at the end of the experiment.
The oxalic acid fraction, which
according to the method of Smith and Reynolds 18 should contain Sb }25,
was analyzed in a gammaspectrometer for the presence of sp}25,
Figure 3a shows the gammaspectrum for the fraction and demonstrates
the presence of strong peaks at energies of 0.17 Mev, 0.43 Mev,
0.61 Mev.
and
The peaks are in agreement with those of Sb125 ag given by
Lazar 2 both as to energy and relative intensity.
Confirmation of the presence of sbi25 in a portion of the anion
fraction was obtained by the use of standard radiochemical precipitation
procedures.
The gammaspectrum 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 gasflow chamberwith and without a 4.7 mg/ cm? aluminum absorber,
count in the sample was reduced from 314 c/m to 41 ¢/m.
the
This re-
duction in count indicated that the major portion of the radioactivity was
of low energy and suggested the presence of Fe°5 contaminated with