A STUDY ON THE METHOD OF TERRAIN CORRECTION FOR AIRBORNE GAMMA-RAY SPECTROMETRY UNDER COMPLEX CONDITIONS
复杂地形条件下航空伽玛能谱地形改正方法探讨

Based on the theory of airborne gamma-radiation from a rectangular radiator, we study and test a terrain correction method for airborne gamma-ray energy spectrometry under complex topographic conditions. Using the DTM data acquired by airborne geophysical measurements and the forward relationship between radiator on the ground and the air gamma field distribution, we make forward analysis and inversion derivation for the interpretation principle of the airborne gamma energy spectrum. Then we propose a terrain correction method according to the influence angles. This method can be applied to terrain correction point by point for the airborne gamma energy spectrum in cases of any flight ways and arbitrary topographic conditions. The test result shows that this technique can basically eliminate topographic influences in measurements of airborne gamma-energy spectrum. After such terrain correction, the anomalies of the airborne gamma energy spectrum can reflect well the real situation of the radiator on the ground.