The Spectral gamma tool measures the natural gamma spectral energy caused by the decay of Potassium 40, Thorium, Uranium and other radioactive isotopes. The gamma emission of each of these elements and isotopes differe in its level of energy (Potassiom 40 ~ 1.46 MeV; Thorium ~ 2.6 MeV; Uranium ~ 2 MeV) . The tool measures the energy of the gamma emissions and counts the emissions corresponding to each energy level.
Application of tool:
- detection of Uranium mineralization
- grade control (total amount)
- differentiate between shales and potassium salts
- recognize and estimate percentages of mineral types in bedrock surrounding a borehole
- compute shale percentages
- detect arkosic sand units
- determine clay mineral types
- identify clay depositional environments
- detrital: high thorium/low uranium ratios
- marine: low thorium/high uranium ratios
- correlate structural and stratigraphic features
- study water-rock interactions
- map clay content
Probe description:
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body: titanium (grade2)
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diameter: 42mm corpus, 48mm gamma capture
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length: 150cm
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operational conditions: 60° / 200bar maximum
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measurement spectrum: 60KeV - 3048KeV
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temperature compensated
