UK T. (+44) 1492 582 323

Americas T. +1 (559) 456-1711

Asia T. (+852) 6503 3486


The ultra-slim and triple gamma probes measure the activities of naturally occurring or man-made isotopes.

Principle of Measurement:

The probes are based on scintillation gamma detectors. The detectors measure the natural-gamma radiation released from potassium and the decay products of uranium and thorium in the borehole.


  • Small diameter for slim-hole operations
  • Multiple detectors with different sensitivities


  • Natural gamma


  • Mineral detection
  • Strata correlation between wells


Triple Gamma Probe

Diameter: 38mm
Length: 1.70m
Weight: 6kg
Natural-gamma detectors: 25mm x 25mm NaI(Tl)
50mm x 25mm
100mm x 25mm
Temperature: 0-70⁰C(extended ranges available)
Max. pressure: 20MPa

Ultra Slim Gamma Probe

Diameter: 20mm
Length: 0.46m
Weight: 4kg
Natural-gamma detectors: 125mm x 17.5mm Cs(Tl)
Temperature: 0-70⁰C(extended ranges available)
Max. pressure: 10MPa

Operating Conditions

  • Borehole type: open/cased, water/air-filled

Sales Information

I002009 Triple gamma probe
I002007 Ultra-slim gamma probe

Download Natural-Gamma sheet


...Practical Innovation with Global Service & Support...

Robertson Geologging Ltd., 2017

how can we help you?

(+44) 1492 582 323