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A common logging method used today for quantitatively evaluating injection profiles is radioactive-tracer logging. Radioactive-tracer logging methods can be placed into two broad categories: (1) a tracer material is injected from the surface, and (2) a radioactive tracer is ejected from a logging tool in the wellbore. The first category is generally referred to as tagging a material to be injected into a well, such as adding a radioactive isotope to some of the proppant in a fracturing treatment or adding an isotope to cement. After the tagged material has been injected, a gamma ray log is run to locate the radioactive tagging agent. We will give a brief review of the most common radioactive isotope tagging applications. The second method of introducing a radioactive isotope into wellbore fluids is the more common way to measure flow profiles, especially in water injection wells.

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