= Formation evaluation gamma ray
{wiki=Formation_evaluation_gamma_ray}
Formation evaluation gamma ray refers to a method used in the assessment of subsurface formations, typically in the context of oil and gas exploration and production. The gamma ray measurement is a common logging technique that detects natural gamma radiation emitted by rocks and formations in the borehole. This radiation is primarily the result of the decay of naturally occurring radioactive isotopes, such as uranium, thorium, and potassium.
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