Fission Xenon in Wausau, Wisconsin Granite
Mass spectrometric analyses of xenon released by stepwise heating of large granite samples from Wausau, Wisconsin reveal (i) a low temperature, xenon-rich fraction which is slightly enriched in the light isotopes in the manner expected from mass fractionation of atmospheric xenon, and (ii) a high temperature fraction which is enriched in the heavy isotopes of xenon in the manner expected from the spontaneous fission of 238U. These analyses reveal no evidence of the anomalous fission yields which would be produced in spontaneous chain reactions.
E. W. Hennecke et al., "Fission Xenon in Wausau, Wisconsin Granite," Journal of Inorganic and Nuclear Chemistry, vol. 40, pp. 1281-1284, Pergamon Press Ltd., May 1978.
The definitive version is available at http://dx.doi.org/10.1016/0022-1902(78)80034-7
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