In exploration of the sandstone type uranium deposits, the effective information of gamma ray spectrum is often covered by surface information due to the influence of surface overburden and other factors. In order to extract information related to uranium mineralization, the authors carried out the application of thorium normalization by gamma ray spectrum in Dalin area. The residual anomaly of uranium extracted is in agreement with the distribution of the known uranium orebodies and faults. The analytical results show that the method of thorium normalization can exhibit the distribution of faults effectively. Within this area uranium mineralization is controlled by faults, the abnormal area of uranium residual is also the transition zone of oxidation-reduction, which provides the basis for the next exploration within this area.
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