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AGRS airborne gamma ray aircraft background atmospheric radon attenuation coefficients barometric calculated calibration pads Chernobyl Chernobyl accident client Compton scattering contour maps cosmic and aircraft cosmic ray Counts/s data acquisition dead decay products decay series described in Section detected detector package detector volume determined digital data digital records downward electronic emitting equation fallout fiducial field computer flown flying height gamma radiation gamma ray spectrometer Geological gridded ground concentrations ground level exposure high energy IAEA instruments level exposure rate line spacing low energy magnetometer mbar method monitor natural radioelement mapping nuclear nuclides plotted potassium procedure processing produced profiles pulse radar altimeter radioactive radioactive decay radon background radon components sample source check spectral spectrum statistical noise stripped count rates stripping ratios subtracted system sensitivities tapes test strip Th window thorium three radioelements total count window unit spectra upward looking detectors uranium values window count rates