High Resolution Gamma-ray Spectroscopy for Well Logging

A 3-cc Ge(Li) solid-state gamma-ray detector has been used to survey the gamma-ray spectra produced when 14-Mev neutrons interact with several common earth elanents and rocks.The energy resolution of the Ge(Li) detector was about 0.5% at a gamma-ray enerqy of 1.3 Mev.This compares with a value of about 5% for the best Nal(Tl) detector.The order of magnitude increase in resolution permits the spectra to be studied in much finer detail than heretofore possible, and the results of the surveys allow some interesting conclusions and speculations regarding the future of nuclear elemental analysis in the field.

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