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QL40-GR – Natural Gamma



The QL40-GR probe measures the amount of gamma radiation occurring naturally within the formations crossed by a borehole. Gamma rays are produced mainly by isotopes of potassium, thorium, and uranium. The gamma log is widely used in the groundwater and mining industries to identify lithology and perform clay content analyses.

The tool is supplied as a stackable sub of the Quick Link (QL) product line or it can be run as a standalone tool. The QL40-GR operates on any standard wireline (mono, 4 or 7 conductor, coaxial).


Operating Conditions

Borehole Fluid
[X] Water
[X] Mud
[X] Dry

[X] Uncased
[X] PVC Borehole
[X] Steel

[_] Required
[X] Not Necessary

Features & Benefits

Specifications – Metric/English

Specification Metric Imperial
Diameter 42.3 mm 1.66″
Length 1.03 m 40.5″
Weight 4.67 Kg 10.3 lbs.
Max. Temp. 70ºC 158ºF
Max. Pressure 200 bar 2900 psi

Sensor: NaI(Tl) Crystal 2.22 cm x 7.62 cm (0.875” x 3.0”)

QL Stack Possibilities


QL40-GR Natural Gamma Probe Brochure
User Guide

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