Radioactive tracers have been successfully utilized to interpret the placement of stimulation treatments. A field data acquisition system has been developed to monitor tracer injection in real time. By placing a gamma ray sensor assembly over the stimulation line used in acid, fracture or cement treatments, radioactivity measurements are taken in order to monitor the amount and duration of the tracer being injected. An over the line monitor is connected to a laptop computer in order to record the data. This system insures that the tracer is added in a continuous, controlled manner as required. Software has been developed to enhance the ease of data acquisition in harsh field environments. The equipment is also capable of monitoring other stimulation treatment variables such as pressure and temperature. A description of the hardware and software is followed by several examples in the body of the report.

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