~33-
resin column techniques is provided by gamma spectrometric observations on whole samples.
Of the transition elements reported in this paper, Co™~
zn°5 were first detected by their
samples,
#
60
and
peaks in spectra of whole
Fe, Pe-?, Co?”," 0%, and Mn 34 were not identified,
however, until the samples containing them were subjected to
chemical and ion exchange separation, although the
7
Co! , C028, and Min were present in whole samples.
and 1.33 MEV
7
peaks of
The 1.17
peaks of ¢0°° were first observed by the pres-
ent workers in the following samples examined in late 1956 and
early 1957:
Organism
Date of collection
Site of collection
Whole fish
Nov. 8, 1952
Janet Is., Eniwetok
Snail liver
June 19, 1954
Belle Is., Eniwetok
Bonito muscle
Nov. 26, 1954
Bruce Is., Eniwetok
Clam kidney
June 1954
Belle Is., Eniwetok
Clam kidney
July 1955
Belle Is., Eniwetok
Clam kidney
Sept. 1956
Belle Is., Eniwetok
Crab carapace
July 27, 1956
Belle Is., Eniwetok
Herring
July 27, 1956
Belle Is., Eniwetok
Plankton
Sept. 1956
West of Eniwetok
Fish liver
Sept. 22, 1956
Belle Is., Eniwetok
Gamma spectra from the first two samples (snail liver and
bonito muscle) above are shown in Fig. 10.
The Co
60
7
peaks
of the snail liver are not as well cefined as those of the bo-
nito muscle or the Co
60 spikes.
This is due to the penetration
of the aluminum case of the NaI erystal by high energy
PB
radi-