Analysis and solution of negative values in airborne radioactivity data processing
De-Wei DENG1,2, Bo YANG1, Yu-Qin YANG1, Xue WU1, Hua-Shan JIA1, Xiang ZHANG1, Yan LUO1, Cheng QI1
1. Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002,China 2. Key Laboratory of Uranium Resources Geophysical Exploration Technology, Shijiazhuang 050002, China
In this paper, the authors processed the navigation data obtained from Alxa Left Banner in Inner Mongolia to summarize the process and main reasons for the formation of the negative value. The results are as follows: ①The nature of radioactive decay has statistical fluctuation, and this property plays an important role in the processing of revised data, especially in areas with low radionuclide; ②A slight negative value of uranium counting rate will occur after background correction and cosmic ray correction, and will increase negatively after atmospheric radon correction; both ends are prone to form high value false anomalies and continuous negative anomalies. After the peel correction, the number of negative values increases greatly, while the height correction and content conversion no longer produce new negative values, but only change the negative values. The authors found that zeroing the negative values generated by the correction process can eliminate high value false anomalies produced by atmospheric radon correction, and that continuous zero value data appear, which is inconsistent with the objective laws. Therefore, normalization method is proposed to eliminate negative values. This method can eliminate the negative value quickly and reasonably, and can control the changed value within a smaller value. In addition, it makes up for the lack and the deficiency of the negative value processing method.
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