- A chemical source generates gamma radiation that is focused into the formation.
- Gamma rays collide with electrons in the formation and are scattered, losing energy in the process, and are finally absorbed.
- The number and energy of gamma rays received at each of the two detectors are measured.
- The number of gamma rays measured is a function of the density of electrons in the formation which is approximately proportional to the density of the formation.
- By using two detectors, correction can be made for mud cake and small irregularities in borehole smoothness.
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