Based On NaI(T1) Scintillation Detector Spectrum Qualitative Analysis And Evaluation

Na I(T1) scintillation detector of the detection efficiency is high, but its low energy resolution, and in the complex environment of the uncertainty of measurement can affect energy spectrum analysis results. Qualitative analysis is one of the main content of spectrum analysis, it mainly includes the spectrum peak processing and data smoothing and making nuclide identification, there are many kinds of method of dealing with smooth and find peaks, so choose what kind of method is more superior, through the evaluation index to measure the advantages and disadvantages of each method and the improved method is put forward.This article mainly uranium(U) and thorium(Th) nuclide spectrum data as an example to analyze,Based on Na I(T1) scintillation detector multi-channel pulse analysis system of the energy spectrum of qualitative analysis method and comparative evaluation,Put forward can satisfy the experiment for the improved energy spectrum data processing method.Spectral data smoothing processing :Intrinsic to the statistical fluctuation of detector and the influence of electronics system noise,In the nuclear spectrum data processing will produce error,In order to weaken the effects of the error, By comparing the different smoothing method of spectral data and effectively we evaluation is very necessary.In this paper, by introducing the Gauss method combined with least square method of Na I(T1)scintillation detector measurement of nuclear energy spectrum smoothing method,Using MATLAB for uranium and thorium spectral data smoothing. Smoothness index is put forward and the relationship between each other for two kinds of parameters for 238 u, 232 Th scientific comparison and evaluation on the spectral data analysis,Can improve traditional smoothing method is put forward different period of combination of smoothing method,Can improve the accuracy and precision of the nuclear energy spectrum data processing.Spectral data to find the peak :Energy spectrum analysis of the key question is precisely calculate the peak position of each peak. Energy spectrum of the qualitative analysis is in order to better identify species,Only find energy spectrum diagram effective peak position accurately,Can according to the peak energy that address all kinds of some species in the sample.This article in view of the uranium(U) and thorium(Th) spectrumusing different methods such as find peak:Derivative method, the covariance method,symmetric zero area transformation method and other methods to find peak spectral data processing,By finding the weak peaks and the ability to distinguish heavy peak factor,quality factor and evaluation of different methods for comparison and evaluation,2. Put forward the improved method jointly seek for peak method, can enhance the accuracy of search peaks, which can determine peak position to identify all significant peak.The evaluation index:In the process of practical analysis, need to energy spectrum peak processing of data smoothing and find all sorts of methods to analyze scientific comparison and evaluation,Then based on the traditional methods to improve the treatment effect is good method.Uranium, the author of this paper and thorium of two different methods of energy spectrum data smoothing and find peak is analyzed,Relationship with each other by the smoothness index and number two parameters of the smoothing effect can be evaluated,And puts forward the improved algorithm to achieve the better smooth effect,Through the evaluation factor, quality factor to compare and evaluate the efficacy of the find peak, and puts forward the improved algorithm makes the peak effect is better...