-2(mullet), suggesting that selection in favor of the non-fission
4sotopes was occurring in these animals.
Kawabata (1954) reported the presence of the non-fission
product zn°? 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 zn? might be present.
Subsequently this isotope was
identified in several species of fish (Rinehart
UWPL-43
1955; Yamada
1955; Mori and Saiki
Yamatera
spectra,
VY
et al., 1955;
et al., 1955, 1956; Saeki, Okano, and Mori
1956; Yoshii
et al., 1956;
1956; Nagasawa
‘etal., 1956) and in plankton (Seymour
etal., 1957).
In 1956 two additional non-fission product isotopes were |
reported in biclogical samples:
C00 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
tron fractions.
Yoshii (196)
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 Co? in many
organisms was established; also the presence of Co?! , Coe, and
Mn? in several samples was suggested.
In the present study all
of the above isotopes were identified.
In addition Fe? and Feo?
were found.