Nuclear logging is not new to the oil industry. In the last few years this method of reservoir analysis has been applied to evaluating potash deposits in the United States and Canada. The purpose of this paper is to report results from deposits in the Paradox Basin in the United States and the Prairie Evaporite section in Saskatchewan. In order to properly evaluate results of interpretation procedures as developed through field use it is necessary to briefly explain the principles of operation, the type of equipment available for field use, interpretation principles as a result of laboratory and field experience, actual field results in various areas and recommended operating procedures.

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