GRS42/60/73

The detector assembly comprises of a 25 x 50 mm (GRS 42) or 50 x 150 mm (GRS 60) cylindrical NaI crystal coupled to a thermally stabilised photomultiplier tube.

The probe is capable of resolving 250 discrete gamma ray energy levels over the range 60 to 3060 keV; count rates from all of which are transmitted to the surface during logging.

Subsequently, discrete windows centred on the K, U and Th peak levels are used to derive the concentration of these radioelements.

Optionally, the probe can be calibrated before delivery using the full spectrum method to obtain K%, U ppm and Th ppm.

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GRS42 gallery

GRS42

  • Diameter GRS 42 : 42 mm
  • GRS 60 : 60 mm
  • Length : 1120 mm
  • Weight : 7 Kg
  • T° Max. : 70°C
  • pressure Max : 200 bar

  • Detector GRS 42 : 25 x 50 mm
  • Detector GRS 60 : 50 x 150 mm
  • Spectral energy range : 60 to 3060 keV
  • Spectral resolution : GRS 42 : 250 channels, 12 keV per channel
  • Spectral resolution : GRS 60 : 500 channels, 6 keV per channel

  • dry or fluidfilled
  • open-hole or through steel or PVC casing 75mm minimum

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