Abstract
Thorium dioxide amounting to 1.3 kg was irradiated for 241 days at an average neutron flux of 6×1010n/cm2'sec, and allowed to stand for 1.2yr. This cooling lowered the γ-activity of the irradiated ThO2 sufficiently to permit handling without special shielding. Nine milligrams of 233U were extracted with TBP in dodecane, and determined by α-ray counting. The mass ratio of the uranium isotopes obtained was determined by mass spectrometry. It was indicated that the 233U was contaminated with natural uranium.
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