-ll-
Results
The identification of the isotopes in the present samples
was confirmed for both the chemical and ion-exchange resin column methods by the use of radioactive spikes.
In the latter
technique the spikes were used to determine accurately the elution pattern under the conditions of the present work.
Regard-
less of the number of Lsotopes used in an experiment, the elution pattern remained essentially the same; the isotopes were
always eluted in the same fraction as shown in Table 2,
Table 2.
Summary of the tsotopes eluted from Dowex 50 cationexchange resin
Praction
Isotopes present
Anions
Rut? _ppyt
0.5% Oxalic
Zr??-Nb??
gr? -Nb??
Acid
0.15 N NH,Cl+
0.1 N HCl
Fe?
@r99-Nb9?
cst3?
5% Ammonium
Citrate
137
cel44 _pp144
gn
d-e
f-J
an 65
690
mnd4
pH 4.1 a-e
Min>4
pH 4.6
Sr
f-h
sr99
90