抄録
A simple procedure has been developed for separating U from F. P. and neutron-irradiated Th. The separation is performed with tri-n-butyl phosphate in a system of dodecane-mixture of sulfuric acid and aluminium nitrate.
Uranium dioxide was irradiated with 20MeV bremsstrahlung, which produced both 237U and F. P. The target was dissolved in dilute nitric acid and U was extracted into the organic phase of the above mentioned system. Finally, U in the organic phase was back-extracted into an aqueous phase. The γ-ray spectrum and decay curve of the separated U fraction show no radioactive nuclides other than U isotopes and its decay products.
This method can also be applied to the preliminary separation of 233U from neutronirradiated Th.
The distribution ratios (Kd) for U, Th and some other elements in the extraction system are also given.
