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Geophysical Gamma Logging Technique

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Gamma logging is a method of measuring naturally occurring gamma radiation to characterize the rock or sediment in a borehole or drill hole. It is a wireline logging method used in mining, mineral exploration, water-well drilling, for formation evaluation in oil and gas well drilling and for other related purposes

JFS-2 Natural Gamma probe


The JFS-2 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.

Features & Benefits:

1、Versatile, ubiquitous probe which functions with a wide range of applications and borehole conditions.

2、Gamma probes with other scintillation materials and sizes can be custom made for your application.


Bed boundary analysis

Facies changes

Coarsening/ Fining Sequences

Identify Clay Aquitards

Aquifer Thickness

Uranium Concentration


1. Natural gamma sensor:NaI Crystal

2. Measuring Range:

Natural gamma:0~32768cps

3. Measurement Accuracy:5%(F.S)

4.Energy Threshold:≥0.06MeV

5. Environmental: Temperature≦80℃;Pressure≤20MPa

6.Signal: bipolar codes

gamma logging probe


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