Isotopic compositions of xenon and krypton in Belgian Congo pitchblende

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Isotopic compositions of xenon and krypton released from a sample of Belgian Congo pitchblende were measured mass-spectrometrically in stepwise heating experiments. Relative contributions from spontaneous fission of ²³⁸U, thermal neutron-induced fission of ²³⁵U and fast neutron-induced fission of ²³⁸U, to the production of fissiogenic xenon found in the ore were calculated to be 64.1, 18.8 and 17.1 percent, respectively.