The Research Of The Method Of Stochastic Interference Cancellation For Ground Gamma Spectrum Measurement

Spectrum measured in the nuclear ground geophysical measurements is an important means to solve the geological, engineering, environmental and other issues related to one of the main methods. With the development of methods and techniques, ground-γray spectrometry used more and more widely. However, due to the ground during theγray spectrometry by many factors, resulting in measurement results can not reflect the real situation of the target area, so the measured data to eliminate the interference effect will be very important.In this paper, the wavelet filtering method, trend surface analysis, entropy averageγspectrum measured on the ground of local interference with the basic principles and methods to eliminate the application of the methods of geological mapping in shallow cover areas ofγray spectrometry and application profile dataγSpectroscopy measurements to determine the location of the ancient city wall plane measurement data were processed. The results show that: the average entropy method for the elimination of surface vegetation and soil element enrichment of local random interference, highlighting the obvious effect of the weak anomaly, for the medieval walls of the weak anomaly archeological more prominent, so that the boundary clear; wavelet filter for the elimination of random interference and Better the effect of statistical fluctuation, significant suppression of local interference, highlighting the unusual part of the boundary definition of abnormal, abnormal width of the agreement with the actual width of the wall; trend surface analysis the higher order the more you can sample data in the "trend , "reflect, but the higher the order trend surface equation more prone to pathological matrix, so that the effect of the data processed distortion, distorted the original meaning of the data.Through this study can be found: a variety of filtering methods have advantages and disadvantages. Wavelet filter, trend surface analysis, the average entropy method can effectively eliminate the random ground disturbanceγray spectrometry, but the trend surface analysis higher the order of the data more easily distorted; wavelet analysis, while the suppression of local interference Weaken the larger the abnormal; entropy better able to eliminate average local interference, and less abnormal weakening.