The 2LSA-1000 probe measures the amount of gamma radiation occurring naturally within the formations crossed by a borehole and counts the number of gamma emissions associated with each energy level. Gamma rays are produced mainly by isotopes of potassium, thorium, and uranium and their decay products. The spectral gamma ray log is widely used in the mining and environmental industries for the identification of lithology, correlation between boreholes, and clay content analyses.

The larger crystal used within the 2LSA-1000 allows better counting statistics resulting in improved quantitative analysis in uranium applications, isotope ratios, and clay typing. This tool provides real time temperature compensation, as calibration coefficients determined during factory testing are stored within the tool. Spontaneous potential and single point resistivity are also measured.


  • Mineral Detection
  • Sedimentology- Facies changes and depositional environment
  • Lithology Studies
  • Identify and Classify Clay Types
  • Recognition of Radioactive material
  • Contamination Research

Operating Conditions

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

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

[_] Required
[X] Non-Necessary

Features & Benefits

  • Real time temperature compensation not typically offered by other spectral gamma tools
  • Larger crystal allows for better Potassium, Thorium, and Uranium statistics
  • Versatile, ubiquitous probe which functions with a wide range of applications and borehole conditions.
  • Users can select from three operational modes: 256, 512, or 1024 channels
  • Mount Sopris manufactures more natural gamma and spectral tools than any other slimline manufacturer in the world today.

Specifications – Metric/English

Specification Metric Imperial
Diameter 44 mm 1.75″
Length 1.85 m 72.8″
Weight 7 Kg 15.4 lbs.
Max. Temp. 70ºC 158ºF
Max. Pressure 200 bar 2900 psi


Sensor: Scintillation Na(Th)I Crystal 2.6 x 19.3 cm / 1” x 7.6”
Measurement Range: 1 to 100,000 cps
Accuracy: 1% Full Scale
Resolution: 0.1 cps
Gamma Energy Range: 0 to 3 MeV

SP Range: ± 2000 mV
SP Accuracy: 1% Full scale
SP Resolution: 0.5 mV

SPR Range: 0 to 1000 Ohms
SPR Accuracy: 1% Full scale
SPR Resolution: 0.5 Ohm


Data Sheet

Print Friendly, PDF & Email