-31rations on two dif9] MEV peaks were observed in cobalt sepa
ferent 1956 samples.
Fish liver homogenate collected at Belle
sample
Island, Eniwetok, September 22, 1956, and a plankton
(No. 42) taken 470 miles west of Eniwetok, September 13, 1956,
Y
(Seymour et al.,1957) both exhibited strong .61 MEV
peaks
tn the whole samples as well as in the cobalt separation.
The
peaks attributed to Co?! and Co°° were also present in the whdle
samples and in the cobalt separations.
Raditochemical separations for zinc were made on two
(2)
fish liver samples:
a.
4
Fish liver homogenate, Belle Island,
Eniwetok
Atoll, September 22, 1956.
‘RR
a
“zz
ae
b.
Bonito liver, How Island, Bikini Atoll,
September 22, 1956.
A comparison of the c/m PB
for the total sample and the
a eekly
zn? fraction could not be made for sample I because the total
Sample count was made with the methane gas-flow counter and the
zn°> count with the end window geiger tube.
However, sample II
and its ze? fraction were counted on the methane gas-flow counters
and out of a count of 8,450 c/n PB
c/n B
in the whole sample, 3,600
were obtained in the zinc separation.
The
7Y
curves
for the two samples and that of a zn°? spike are shown in Fig. 9.
A small amount of contamination by cobalt radioisotopes was present in the zine separations.
Supplementary evidence concerning the distribution of the
non-fission products to that obtained by chemical and ion exchange