~37-
Organism
Date of collection
Site of collection
Fish gut
May, June, 1954
Belle Is., Eniwetok
Whole mullet
May 19, 1954
Edna Is., Eniwetok
Plant leaves
Sept. 22, 1956
Bikini Is.
Plankton
June 1956
West of Eniwetok
Plankton
Sept. 1956
(Scaevola)
Coconut crab liver
"
"
Coconut crab
carapace
"
"
Bonito liver
Bonito muscle
noe
Nan Is., Bikint
eon
Sept. 22, 1956
tt
it
"
"
Bikini Is,
be]
y
tt
Fish liver
homogenate
Gamma spectra from the first five samples are shown in
Fig, 12. Only in the fish liver sample is the zn°? 7
peak
low, in which case it is masked by the 1.17 MEV peak of 0°? ,
The
7
peak for zn? 413, however, strong in the curves for the
other fish tissues
(gut, bone,
skin,
and muscle) indicating a
high level of zn? in comparison with the other
mn54 1s also present in the fish bone,
JY
emitters.
skin, and muscle samples.
The latter sample also exhibits a weak peak for Csl37, an isotope
often found in the muscles of many species of animals collected
at the Pacific Proving Ground.
High levels of an? are also present in fish collected re-
cently (Sept. 1956, Fig. 13) as well as in the 1954 fish samples
described above.