-14-
The zn65 peak at 1.12 MEV occurred in every tissue sample tested,
indicating the common occurrence of this isotope compared with other
gamma emitters.
This radioisotope has been observed in fish tissues
by many authors,
as summarized by Lowman et al. (1957).
Additional
data from this Laboratory are given in Table 4.
;
The Coo? peak of 0.12 MEV was present in the liver of all fish
tated. however, it
appears to be
rather
omnivorous fish taken at Rongelap Island.
low in the liver
tissue of
This radioisotope was not
detected in goatfish gut or goatfish bone, but occurred in small amounts
in goatfish muscle.
No distinct peak at 0.12 MEV appeared in the
muscle tissue of reef fish or in halfbeaks taken at Kabelle Island.
The peak of Mn°4, at 0.84 MEV, was partially obscured by the Co58
peak at 0.81 MEV.
One or both
of these radioisotopes
present in the muscle and liver of reef fish from
appeared to be
Enibuk Island, in
muscle and liver of halfbeaks from Kabelle Island,
the
and possibly were
present in the muscle of reef fish from Kabelle Island.
Verification of
the presence of both of these isotopes in Enibuk reef fish liver was later
obtained by ion-exchange resin column analysis (see below).
The Co0 peak at 1.17 MEV was obscured by the Zn§9 peak at 1.12
MEV; however, the C050 peak at 1.33 MEV was observed in
the liver
and muscle of Kabelle goatfish and in the liver of Rongelap omnivorous
fish.
The presence of Co60 was also later verified by ion-exchange
analysis of Enibuk reef fish liver.
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