Gamma ray borehole logging.

摘要

A method and apparatus for natural gamma ray spectral logging of a well borehole to determine the abundances of uranium (U), potassium (K), and thorium (Th) gamma rays in the earth formations adjacent to the borehole and for compensating for borehole attenuation effects upon such gamma photons caused by scattering and absorption phenomena in the materials within the borehole.