Spectrometric Gamma Ray Logging of Core


James E. Atwater
GEOTECHnical Resources Ltd



A computer based scintillation gamma ray spectro- meter is described which acquires data in three dimensions as gamma ray energy versus intensity and linear displacement. The instrument uses two thallium activated sodium iodide crystals (NaI(Tl)) coupled with standard Nuclear Instrumentation Modules (NIM) and Computer Automation, Acquisition and Control (CAMAC) pulse processing electronics.