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abundance AIRBORNE INSTRUMENTS airborne system analog analog record Appendix background blank bore hole bore-hole logging calibration facilities calibration factor calibration sources CALIBRATION SYSTEM Compton scattering concrete constant constructed correction factors count rate counts/s decay products decay series density detector determined diameter dimensions discrimination level effectively infinite equilibrium equipment evaluate gamma radiation gamma-ray energy gamma-ray spectrometric geological GM counters ground height correction parameter homogeneous IAEA isotope laboratory log analysis logging speed logging systems material metres mineral minimum model holes moisture Nal(Tl natural radioactivity P.O.Box photoelectric effect photons pipe pitchblende portable instruments potassium window ppm Th probe quantitative radioelement concentration radiometric measurements radium radon ratio rays recommended units REPORTING METHODS rock sample volume scintillation counters secular equilibrium sensitivity spectra spectrometer standard conditions surface survey altitude system dead-time test strip thickness total count measurements unit of radioelement uranium and thorium uranium exploration values Zeff