Portable gamma ray spectrometer

Each geological object contains more-or-less amount of radioactive isotopes. The most common ones are U, Th and K. Their concentration and ratio is a valuable diagnostic tool at the identification of the lithologies and their facies. The detection and quick quantifiction of the radioactive isotopes is a crucial measurement at many types of explorations.

We introduced for the undergraduate education of geologists the usage of portable gamma-ray spectrometer. A GR-135G is available for courses and for field works of students. This instrument has a relatively big detector, thus the aquisition time is relatively short and the sensitivity is high. Beyond the assay of the common natural isotopes (U, Th, K) the multi-channel analyser is able to identify artificial isotope contaminations.

More information about the method and the capabilities of the instrument:

Introduction talk held in Göttingen, 2009 about gamma ray spectrometry (pdf, 2.5 Mb)

Quick info and most important parameters of GR-135G (pdf 0.2 Mb)

Brochure of the producer of GR-135G (pps, 4.2 Mb)

User manual to GR-135G (available at the Sedimentology Department)