The measurement of the natural radioactivity of the rock formations intersected by a borehole is known as the ‘gamma ray log’. The natural radioactivity is measurable and connected to the issuance of gamma rays from radioactive minerals or rocks.
The gamma rays are the only one with a high penetration capability and therefore the measurement can be performed even in cased boreholes.
♦ Indication on lithology and location of clay / evaporite deposits within stratigraphic sequences;
♦ Identification of bentonite seals and indication on the grout quality;
♦ Information on the grainsize evolution of sedimentary sequences and identification of disconformity and transgression surfaces;
♦ Correlation between boreholes;
♦ Identification of shear surface of landslides.