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GRT-20 | 2-3/4” Gamma Ray Pulse Tool

The DSS 2 3/4” Gamma Ray pulse Tool (GRT) measures the gamma radiation level of the formation derived from natural isotopes. It can be used as a depth correlation device between cased and open holes. This tool is comprised of a Sodium Iodide scintillation crystal and photomultiplier tube which demonstrate high sensitivity and resolution. The GRT-01 outputs 25 µs pulses in response to gamma radiation within the well.

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  • Gamma radiation measurements.
  • Depth correlation.
  • Reservoir delineation.


  • Rated for High-temperature and high-pressure environments.
  • Scintillation crystal combined with a photomultiplier.
  • Compatible with most surface systems.
  • Runs on all standard wirelines.
  • Power and telemetry are connected from the top to bottom of the tool.
  • Can be run by itself, or combined with most analog tools.
  • Electronic design verified for 1 hour operation at 415°F to ensure reliability.
  • Easy to service and maintain.


Tool Operating Voltage 90-150 VDC Tool Length (make-up) 66.68 cm (26.25 in)
Tool Operating Current 20-25 mA Tool Length (Shipping) 74.93 cm (29.5 in)
Output Pulses Amplitude Negative 7.5 VDC Tool Weight 11.6 Kg (28 Lb)
Output Pulses Width 25 µS Measurement Point from Top of Tool 43.35 cm (17.07 in)
Max. Pressure 172.4 Mpa (25,000 PSI) Borehole Fluids Oil – Fresh Water – Brine
Max. Temperature 204°C (400°F) Top End Connector Contact Socket Go Female
Tool Diameter – OD 69.85 mm(2-3/4 in) Bottom End Connector Contact Pin Go Male



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