Gamma Cone Penetration Testing (GCPTu)
The Gamma Cone Penetrometer (GCPT) can be used to better identify soil stratigraphy in conjunction with the CPT using natural gamma radiation which is present in all soils. Finer soils contain a greater amount of the radioactive elements potassium, uranium and thorium. A continuous gamma profile can be logged and used to improve the CPT interpreted stratigraphy.
In addition, the GCPT has environmental applications. It can be used to locate radioactive contamination based on a gross gamma ray count. Once the contamination is located, the GCPT can develop a gamma energy spectrum in order to identify a contaminant. Since the GCPT is a penetration tool, there are no cuttings brought to the surface and worker exposure is eliminated.