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γray spectrometry is a very important nuclear geophysical method, it can directly measure the content of U, Th, K in the rocks’surface, soil, ore. And obtaining the information of relevant nuclide. It has a very important role for uranium exploration, rock analysis, customs and quarantine, surveying and environmental gas radiation detection.To meet the gamma spectrometer for laboratory analysis and field measurements of the demand, the paper developed for the purpose of this multi-channel gamma spectrometer measurement and analysis software and the PDA-based analysis software were used to measure the Uranium (U) , Thorium (Th), Potassium (K) elements and content of radioactivity.Develop the software of Multi-channel gamma spectrometer measurement analysis is based on the MFC VC + +.And based on the analysis of PDA software on its basis, after the transplantation of the relevant function code, modify, and compiled, and the two softwares have the same basic functionality. Here only introduce multi-channel gamma spectrometer for measurement and analysis software.According to the functions the software is divided into six modules: File Operation, Data Acquisition, Spectral Analysis, Energy Calibration, Instrument Calibration, and Specific Activity Analysis.Meanwhile, in order to meet the different environments’needs of the measurement, in the data acquisition module, it’s designed to two modes: serial port communication and USB communication for personnel selection. In the smooth lines, I design two methods: Five-point three times and Seven times smoother poly nomial, to fit the analysts to choose which method accord to the actual form of line, which can increase the accuracy of the data analysis. In the peak search, I design two methods: Five-point three times the first order derivative and Five Points in three second derivative method to find peak. For the bad line, analysts can choose the second derivative method to improve the resolving power of the heavy peak. In terms of setting the boundary peak, in order to better eliminate false peaks, the boundary conditions were strictly limited, and only meet five conditions in order to determine the border. In the specific activity analysis module, I design two methods: The characteristic energy segment decomposition method and The least square iterative method, to calculate the specific activity of radio nuclides. Through the comparison of the two results of the error, which has a better determine to the accuracy of the results. In the spectrum stabilization, I use the real-time software spectrum stabilization technology, combined with the probe end of the spectrum stabilization circuit, which can effectively suppress the interference spectrum of drift.By testing various functions of the software, and it’s proved to achieve the expected goals.
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