放射能汚染魚類の放射性物質-III

1956年の太平洋における放射能汚染カツオ(その2) Cd^113mの存在について

抄録

Succeeding to the previous papers, the present paper deals with the presence of Cd^113m.
Group II, separated directly from the raw ashes of the liver or the pyloric caeca of skipjacks, Katsuwonus pelamis, or from the radio active fration, “6-L-F₂”, obtained by ion-exchange resin, was fractionated further into each member (Fig. 1). The considerable activity was found in Cd-fraction in both cases (Table 1).
The Cd-fraction showed no decay in 50 days and no γ-ray emission. The maximum energy was found to be 0. 6 MeV., when calculated from the absorption curve (Fig. 2). From these results, the nuclide in question was identified as Cd^113m.
The weak activity was also found in Sn-fraction in the above fractionation, but the nuclide has not yet been identified.