Neutron – Thermal Neutron


The QL40-NEU neutron probe utilizes a He-3 thermal neutron detector. It measures Neutron porosity in counts per second, which can be directly related to the porosity of the formation. The probe has been carefully designed to maximize the detector sensitivity so that good results can be achieved with source strength of only 1 Curie. The source is carried in a specially designed shield and the probe itself is the source handling tool.

The QL40-NEU tool is stackable within the Quick Link (QL) product line or it can be run as a standalone tool. It can be run in any borehole environment.


Single He-3 thermal neutron detector

Temperature – Pressure

0-70°C (32-158°F) 200 bar (2900 psi)

Diameter – Length

40 mm (1.6”) – 1,34 m (46”)


5.5 kg (12 Ibs)


0 – 100.000 CPS


Qualitative measurement of formation porosity in open and cased holes.

Measures hydrogen content of formation.


Manufactured by Geotomographie GmbH

Technical Details

Generated wave types: SV
Signal frequencies: Up to 500 Hz (depending on geology and borehole distance)
Operational depth: Up to 100 m
Source length: 1015 mm
Source weight: 6 kg
Cable weight per metre: 377 g
Borehole diameter: 75-100 mm (or larger if spacers are used)
Clamping system: Infatable bladder
Depth indicator: Cable marking every 2 m
Connector: To impulse generator IPG800 or IPG5000
Storage: On drum
Switch box: Switch between two vertical shot directions

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