Geophysics lecture 06: Electric (wireline) logs - Gamma ray logs

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Geophysics lecture 06: Electric (wireline) logs - Gamma ray logs.

This video lecture series on Geophysics (Undergraduate course GY 305) was made by Dr. Douglas W. Haywick from the Department of Earth Sciences at University of South Alabama.

Radioactive decay

There are three modes of decay:

  • Alpha decay: loss of alpha particles - convert parent into element that has nucleus containing two fewer protons
  • Beta decay: loss of beta particle - convert parent into element whose nucleus contains one more proton by losing an electron
  • Gamma decay: capture of beta particle - convert parent into element whose nucleus has one less proton.

Gamma ray emissions occur in all types of decay. Gamma ray logs record the radioactivity of a formation. Shale tends to have high gamma radioactive response and sand contains lower gamma radioactive response.

See also


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