Experimental characterization of an in-situ spectrotracer used in geophysical explorations

摘要

The selection of an appropriate detector for field measurements, incase of natural radioactivity, is an important task taking into account constraints givenby data reliability, time and cost effectiveness. This paper provides the necessary datawhen choosing a portable spectrometer Gamma Surveyor based on BGO crystal(6.3 in 3 ). The proven efficiency of the crystal, the weaker energy resolution but stillgood comparable results with HPGe results, obtained for 238 U, 232 Th, 40 K often makesit a good choice. Thus, in this paper some functional parameters, as energy calibration,energy resolution and background of the system are analyzed. In addition, field data,concentrations of radionuclides 238 U, 232 Th, 40 K (ppm) in surface soil on the Bucharestarea are compared with laboratory measurements using HPGe detector. The obtaineddata, for all three radionuclides, are well correlated.