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bismuth carrier—>
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[Sample |2.N
Vig. 1.
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The elution curve from ‘Dowex-1' of bismuth carrier
and bismuth-207 previonsly separated ou a ‘Dowex-s0" fonexehanve column from a sample of alva cuilmeted af Eniwetek
Atoll in March 1961. The dashed dine is the elution curve for
the bismuth earrier in which the levels of bisinath were determined
by the iudide colorimetric test.
The solid line uidientes the
»
activity
of
bismuth-207
in
the
eluted
fractions,
96 per cent confidence-levels for counting error ire given
The
The y-speetrum made from the anion fraction
contained the photopeaks of ruthenium-106-rhodium106 and bismuth-207. 98 per cent of the bismuth-207
was recovered in this fraction. and the remaining
bismuth-207 was eluted in the oxalate fraction.
After removal of the ruthenium from the anion
fraction by distillation with perehlorie acid only the
photopeaks of bismuth-207 were present in the
y-spectruin.
An iodide colorimetric test for bismuth was made
after removal of the ruthenium!, The sample was
dissalved in 10 ml. of 2 8’ sulphuric acid. Five ml. of
1 per cent ascorbic acid together with 1 ml. of | per
eent sodium sulphite. then 1 ml. of 10 per cent
potassium iodide were added to three drops of ihe
saunple in 10 ml. of 2.Nsulphuric acid. The solution
exhibited the orange colour of iodobismuthite.