Isolation of Radioniobium from γ-Irradiated Molybdenum Oxide

概要

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A reverse-phase chromatographic isolation procedure for Nb from Mo and Tc is given. The separation is performed with TBP (tri-n-butyl phosphate) on celite column. Molybdenum oxide was irradiated with 20 MeV bremsstrahlung, which produces a mixture of 93mMo, 99Mo; 99mTc; 91mNb, 95Nb and 96Nb. The irradiation was applied to a 6 N HCI solution of the target. Separation was repeated twice, which resulted in isolation of the radioniobium with a decontamination factor of 104 both for Mo and for Tc. Decay analysis of the activity showed that radioniobium thus separated was composed of 91mNb, 95mNb, 95Nb and 96Nb. The γ-spectrum of 96Nb was obtained by subtraction of the spectrum taken 119 hr after the end of irradiation from that of 74 hr.
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