核数据处理课程设计报告正式稿

核数据处理课程设计

题 目：?能谱谱数据分解方法研究

英文题目：

? Spectroscopy spectral data

Decomposition Method

学 院：核工程与地球物理学院 学生姓名：刘 煜 锴 专业年级：核工程与核技术0 9级 学 号：0 9 0 2 1 1 3 5 指导教师：吴 和 喜 老 师

二零一二年六月

核数据处理课程设计报告

?能谱谱数据分解方法研究

摘要

由多道脉冲分析器获取的谱数据需要以一定的数学方法进行处理才能得到实验要求的

最终结果。能谱的数据处理大致可以分为两个步骤。首先进行峰分析，即由能谱数据中找到全部有意义的峰，并计算出扣除本底之后每个峰的净面积。第二步是放射性核素的活度或样品中元素浓度的计算，即由峰位所对应的能量识别出被测样品中含有哪些放射性核素或被激发的元素，并且由峰的净面积计算出放射性核素的活度或元素在样品中的浓度。

采用不同的物理实验方法，使用不同的探测器时，能谱的数据处理方法也有所不同。在本课程设计报告中采用能谱数据处理中经常用到的峰分析方法，包括谱数据的平滑处理，本底扣除、寻峰、峰净面积计算和函数拟合法解谱。然后，以?谱分析为例，讨论基于计算机的多道脉冲分析系统中的谱在matlab软件平台的数据分解。

关键词：?能谱，解谱，平滑处理，寻峰寻峰

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核数据处理课程设计报告

? Spectroscopy spectral data Decomposition

Method

Abstract

Spectral data obtained by multi-channel pulse analyzer need to be the end result of certain mathematical methods to deal with to get the experimental requirements. The energy spectrum of data processing can be divided into two steps. First peak analysis, all the significant peaks from the spectral data, and calculate the net area of each peak after deducting the background. The second step is Radionuclides or the calculation of element concentrations in the samples, energy identified by the peak position corresponding to the tested samples containing radionuclides or excited elements and calculate the net area of the peak radionuclides or elements in the sample concentration.

Different physical experiments, using a different detector, the energy spectrum of data processing methods are different. This course is designed report using the peak analysis method often used in the spectral data processing, including spectral data smoothing, background subtraction, peak search, peak net area calculations and functions fitting solution spectrum. Then, spectral analysis, for example, the discussion of the data decomposition in matlab software platform based on the spectrum in the multi-channel analyzer computer.

Key Words：?Spectroscopy, deconvolution, smoothing, peak searching to find the peak

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核数据处理课程设计报告

目录

目录 ...................................................................................................................................................................... 4 1前言 ................................................................................................................................................................... 5

1.1 ?能谱分析的目的、意义 ................................................................................................................. 5 1.2 ?能谱分析的主要难题 ..................................................................................................................... 5 1.3 ?能谱解谱的研究简介 ..................................................................................................................... 6 1.4 本次课程设计?能谱分析的研究内容 ............................................................................................. 6

谱数据的平滑 ....................................................................................................................................... 8

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?2.1 重心法 ................................................................................................................................................... 8 2.2 多项式最小二乘移动平滑法 ............................................................................................................... 8 2.3傅里叶变换法 ........................................................................................................................................ 9 2.4 小波变换法 ......................................................................................................................................... 10 3 峰位与峰区的确定 ........................................................................................................................................ 10 4 峰面积方法简述 .............................................................................................................................................11 5 峰相关参数简介 ............................................................................................................................................ 12 6 能量刻度 ........................................................................................................................................................ 13 7 程序的测试 .................................................................................................................................................... 14

7.1实验结果 .............................................................................................................................................. 14 7.2数据分析 .............................................................................................................................................. 17 7.3说明 ...................................................................................................................................................... 17 8 心得体会 ........................................................................................................................................................ 18

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