@book{912a8062f1ff4087822fa4ad056cdfc2,
title = "The Calibration of Portable and Airborne Gamma-Ray Spectrometers - Theory, Problems, and Facilities",
abstract = "A gamma-ray spectrometer for use in geological exploration possesses four stripping ratios and three window sensitivities which must be deter-mined to make the instrumentation applicable for field assay or airborre measurement of potassium uranium, and thorium contents in the ground. Survey organizations in many parts of the world perform the instrument calibration using large pads of concrete which simulate a plane ground of known radioelement concentration. Calibration and monitoring trials with twelve facilities in ten countries prove that moisture absorption, radon exhalation, and particle-size effects can offset a radiometric grade assigned to concrete whose aggregate contains an embedded radioactive mineral. These and other calibration problems an discussed from a combined theoretical and practi cal viewpoint.",
keywords = "Ris{\o}-M-2456",
author = "Leif L{\o}vborg",
year = "1984",
language = "English",
isbn = "87-550-1043-1",
publisher = "Danmarks Tekniske Universitet, Ris{\o} Nationallaboratoriet for B{\ae}redygtig Energi",
}