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GeoVlsta - Density Sondes
GeoVlsta density logging sondes detect gamma rays emitted by a 137Cs source mounted on the sonde. Gamma radiation is attenuated and scattered by Compton Scattering through the formation and then counted at detectors located at set distances. The intensity of the detected gamma rays is proportional to the formation bulk density, with denser materials attenuating more gamma rays and resulting in lower gamma ray intensity at the detectors.
The sondes are designed to suit different data and operational requirements. In geological environments where very high density (>3 g/cc) formations are expected, a higher energy 60Co source can be used instead.
Sidewall Density Sonde
The Sidewall Density Sonde provides quantitative, calibrated bulk density measurements. There are three versions of this sonde. The basic (FDSB) version produces a bulk density log, and a caliper (borehole diameter) log. An LL3 resistivity de- tector can be added to the basic sonde to provide extra utility. Finally, the FDSB can be altered to collect PEF (photoelectric factor) information in addition to density measure.
2-PI Density Sondes
The 2-PI density sonde also known as Trisonde, provides uncalibrated (qualitative) density logs, using a lower activity source. There are two versions of this sonde, a basic version which can only be run at the bottom of a sonde stack, and an in-line version can be placed anywhere in a sonde stack.
- Mineral exploration
- Coal exploration
- Geotechnical investigations
