Natural Gamma-ray Activity of Cores of the KTB Pilot Hole VB1


In the laboratory, the gamma radiation is measured by a sodium iodtite (NaI) scintillation detector (cores and cuttings) and by a germanium (Ge) semiconductor detector (cuttings). The cuttings are measured in air tight Marinelli-beakers with a volume of 250 cm3. For the core measurements a special, automatically operating equipment with three NaI detectors is used. A description of this apparatus is given in Wienand et al. (1989). The principle of measurements with the Ge-detector is described by Bücker et al. (1991).The measured spectra are calibrated by a standard of Luvarovite (NIM-L, South African Bureau of Standards). The influence of the local terrestrial radiation on the measurements has been corrected. Especially for the core measurements a calibration procedure has been performed for geometric corrections (core diameter and length). In general, a measuring time of 12 h for the NaI-detector and 2 h for the Ge-detector was chosen.

Metadata Access
Creator KTB, WG Geophysics
Publisher Deutsches GeoForschungsZentrum GFZ
Publication Year 2010
OpenAccess true
Language English
Resource Type Dataset
Discipline Scientific drilling
Spatial Coverage (12.100 LON, 49.590 LAT)