抄録
Succeeding to the previous papers1)3), the radioelements in the pyrolic caeca of the same bigeyed tuna were analysed by column chromatography with an ion exchange resin, and seven radioactive fractions, F1-F7 were obtained (Fig. 1).
F1 was further examined by the group separation method using carriers and the greater part of activity was detected in Group IIIA. The Al-absorption and decay curves of this group are shown in Figs. 2 and 3. The curves indicated that the nuclide in this fraction was Fe55.
The Al-absorption and decay curves of the other fractions except F5 and F6 are also shown in Figs. 2 and 3. It was confirmed that the nuclides in F2, F3, F4 and F7 were Y90, Zn65, a mixture of Cd115m and Cd115m, and S190-Y90, respectively.
The activity of F5 and F6 was very weak and short-living. These fractions were supposed to be Y90 originated from Sr90 in the interruption of elution.
