-2(mullet), suggesting that selection in favor of the non-fission
isotopes was occurring in these animals,
Kawabata (1954) reported the presence of the non-fission
product ano? in several organs and tissues of the albacore and
big-eyed tuna, thus confirming the earlier postulate of Okano
(personal communication to Kawabata), based on
that and might be present.
1955; Yamada
1955; Mori and Saiki
Yamatera
spectra,
Subsequently this isotope was
identified in several species of fish (Rinehart
UWPL-43
7
et al., 1955;
et al., 1955, 1956; Saeki, Okano, and Mort
1956; Yoshii
1956; Nagasawa
et al., 1956) and in plankton (Seymour
et al., 1956;
etal., 1957).
In 1956 two additional non-fission product isotopes were
reported in biological samples:
60° by Weiss and Shipman (196 )
and Fe?? by Amano et al., (1956).
Amano and his co-workers
also postulated the presence of Fe? on the basis of decay and
absorption characteristics of the
iron fractions.
Yoshii
(1956)
also suggested the presence of Fe? in fish samples and Kawabata
(personal communication, paper in press) subsequently confirmed
the presence of Fe? in contaminated fish,
In
7Y
spectra studies done by the present authors during
the latter part of 1956 the presence of Zn 65 and °° in many
organisms was established; also the presence of Co", C08, and
Mn
54
in several samples was suggested.
of the above isotopes were identified.
were found,
In the present study all
In addition Fe? and Feo?