In addition to its primary role as a lithological or clay indicator, a natural gamma measurement is frequently used as the basis for establishing correlations between boreholes and to ensure accurate depth matching between different logging runs made in the same borehole. For these reasons, many LIM probes provide this measurement as an additional log along with other parameters.

The GR38 probe provides a solution for cases where only a basic, total counts natural gamma log is required.

Based on a ø25 x 50 mm NaI(Tl) scintillation crystal detector coupled to a high-performance photomultiplier tube, the probe boasts excellent sensitivity (±1.2 cps / API unit) and provides a high quality final result.

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GR38 specifications

  • Simple but efficient

  • Diameter : 38 mm
  • Length : 1200 mm
  • Weight : 3.0 Kg
  • Max. Temp : 70°C
  • Max. Pressure : 200 bar

  • Detector size : ø25 x 50 mm

  • Calibration : factory calibration in API units

  • Dry or fluid-filled borehole
  • Open or cased borehole

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