Newly developed instrumentation for Radioactivity Well Logging is described whereby two curves, the Gamma-Ray Curve and the Neutron Curve, are made simultaneously, together with a record of the casing collar positions, on one upward passage of the logging instrument. A functional description of all of the system elements is provided, showing how the resulting log is continuously drawn in the surface vehicle on a multi-pen recorder, with consequent saving in rig-time and elimination of possible depth discrepancy between curves, which may exist where successive runs are required. The application of radioactivity logs to production problems is briefly discussed.

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