GRS42 & 60: Spectral Gamma
The detector assembly comprises of a 25 x 50 mm (GRS42) or 50 x 150 mm (GRS60) cylindrical NaI crystal coupled to a thermally stabilised photomultiplier tube.
According to type the probe is capable of resolving 250 or 500 discrete gamma ray energy levels over the range 60 to 3 060 keV. Count rates from all of which are transmitted to the surface during logging.
Subsequently, discrete windows centred on the characteristic K, U and Th peak levels are used to derive the concentration of these radio-elements.
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