-4-
tin was used.
In this procedure the sample in 0.1 M oxalic acid and
the eluting agents (see Table 2) were passed through a 0. 28 cm” x 10
cm-column of anionic resin (Dowex 1 ) of 100-200 mesh at a flow rate
of 0.2 ml/min.
The fractions were collected in test tubes, and, using
a gamma spectrometer,
the total gammaactivity and the specific
radionuclides then were determined.
Table 2. Summaryof the eluting procedure and the radioisotopes
eluted from the Dowex 1 anion-exchange resin
Volumein
milliliters
Fraction
Sample eluate
Isotopes eluted
20
Sb!25
pH 4.8 a-d
33
Sb 125
e-f
18
Sb 125
1M H,SO, a
b-f
10
54
Sp 125
Sb125, Ry 106_Rp 106
0.1 M oxalic acid
Distilled HO
100
--
12 M HCl
100
Ru!06_Rp,106
Resin
--
spi25. Zr? ®-Nb?”
The presence of Sb 125 in the sample was verified by analyzing the
anion fraction with a standard radiochemical precipitation procedure.
The Sbo53 precipitate obtained in this separation was dried and analyzed