Gamma ray borehole logging method and apparatus having compensation for borehole attenuation effects
 A method and apparatus (43) are disclosed for natural gamma ray spectral logging of a well borehole (41) to determine the abundances of uranium (U), potassium (K), and thorium (Th) gamma rays in the earth formations (46) adjacent to the borehole (41), and for compensating for borehole attenuation effects upon such gamma photons caused by scattering and absorption phenomena in the materials (42) within the borehole. 
Halliburton Logging Services Inc.
G
G01V
inventional
Dan M. Larry L.
Arnold Gadeken