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The Evans hypothesis derived from the study of radium-exposed persons includes two major points: (a) the linear model of radiation carcinogenesis is incorrect, and (b) "practical" and/or absolute thresholds exist below which human radiation carcinogenesis does not occur.Analysis presented here indicates that neither aspect of this hypothesis can be supported, either from the study of residual radium burden or from cumulative rad exposure.This analysis in no way attempts to show that "practical" or absolute thresholds are impossible. Rather, the results of analyses show that no evidence for such thresholds has been presented through the studies of radium-exposed persons.

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