the amount of Sr°
recovered.
15
90 present was
calculated from the amount of
The presence of y?
0
y20
was confirmed by determining
the decay rate of the sample.
RESULTS
Primary Elution from Dowex 50
As shown in Figure i and Table 1, a complete separation of the
radioisotopes from Kabelle Island soil collected
on July 18, 1957,
was not accomplished in the primary elution from Dowex 50.
Four of
the fractions contained more than one radioisotope and it was not
possible to determine accurately the amounts of the different radioisotopes in the fractions.
Consequently, secondary elutions were
required to separate the isotopes.
The anion fraction was found to
contain Sbi25 Ru !06_Ry,106 and Zr95-Nb99.
the oxalic acid fraction,
red and traces of Zr95_Nb95, the ammonium citrate pH 4. 1 fraction,
cel44_p, 144 cs!37 wn®4 and Co89; and the ammonium citrate
pH 4. 6 fraction, Cs!37 ang sr99,
Anion Fraction
The anion fraction was passed through a Dowex 1 resin and the three
radioisotopes present were collected in different fractions (Fig. 2).
The Sb!25 was collected in the 0.1 M oxalic acid and the Ru!06-pp,106