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Core Gamma Logging

Core Gamma Logging



Natural gamma-ray tools measure the radioactive decay of the element’s thorium, potassium, and uranium. Uranium and potassium/thorium ratios are an extremely useful tool for discrimination of different lithologies, refining share volumes, inferring cation exchange capacity, improving fracture detection, and source rock logging. 


The MR-CSGL100 Core Spectral Gamma Logger measures the radiation emitted from the core material while passing through the tunnel in the form of counts and converted into ppm. The natural gamma radiation of the core is monitored and recorded as a function of depth for correlation with downhole logs. The amplitude of the output from the gamma-ray sensor is proportional to the energy of the incident gamma-ray. This information is used to measure the proportion of the total gamma radiation coming from each of potassium-40, the uranium-radium series, and the thorium series for a particular formation.  




  • Core Diameter: 2” to 6”  

  • Conveyor Belt Drive:  9 ft  

  • Dimensions: 108” × 30”  

  • Motion Control: High precision servo motor 

  • Gamma Ray Detector: NaI 3” × 3” crystal with photomultiplier  

  • Weight:  450 lbs. 

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