5, Conclusions
it was initially intended to measure the # anc
y activities of radioactive nuclides after chemical
separation of the elements. As the work progressed,
it became evident chat modifications of usualy fj rocedures
vere necessary to achive adejuate separations of the
elements encountered in this anslysis. The procedures
adapted enable recoveries of greater then 70% of the
original samples to be attained. The redioactive decay
pattern of the total rare earth fraction indicated the
presence of essentially '44.6 - Mtpr , with sossibly
traces of other rare earth clements. The seperation
and determination of Ce and Pr is usually accomplished
by the solvent extraction technique utilizing methyl—
ig@butylketone.
Although the determination of
“zr -
On
in
*Vasam
Yugi
l.
% Nb was
r—-ray
not carried out in this analysis, the exsistence of
these nuclides in planktons indicates the necessity of
establishing methods for the chemical separations and
determinations of the-> elements. An investigation
concerning the analysis of these elements is currently
being conducted in this laboratory. The exsistence of
65on
and
7Y-ray puls hi
19
fishes
Two
Sp
cau
peak
were detected
natural **¢K¢1,
°®go in plankton through 7 counting was
first suggested by Dr. Tsuruga and these determinations
were carried out during the process of this analysis.
In the
g
of 9 Zr5 Nb we
Although the level of radioactivity of tuna fish
examined is rather low, the results suggest their intake
of other sealife may contain much higher concentrations
of radioactive substances.
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% National In: