Natural Spectral

Gamma Ray

Detector

Potassium

Uranium

Thorium

  • The Gamma Ray Tool measures the naturally occuring gamma radiation in the formations.
  • Most naturally occurring radiation comes from potassium which is contained in clay minerals. Thus the gamma ray log is useful for distinguishing shales from non-shales.
  • Some gamma radiation comes from uranium (which is most often found in formations through which water once flowed) or thorium (which is found in various clay minerals).
  • The spectral gamma ray device differentiates these three sources of gamma radiation based on the energy distribution of the gamma rays striking the detector.

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