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摘要：手持式核素识别仪是一种基于多道谱仪的多功能便携式核监测设备，可用于放射性核素的检测、剂量率监测、放射源定位以及核能谱采集与核素识别。其工作原理是根据所测放射性核素的特征γ射线能谱，分析识别出对应核素。它能为危机管理提供核材料探查和鉴别手段，为后果管理提供放射性污染核素组成的测量与分析手段。24642
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相对于固定式的核素识别仪，手持式与其最大的区别就是复杂的工作环境。复杂的工作环境导致无论是传统的NaI(Tl)闪烁晶体探测器，还是较为先进的LaBr3(Ce)闪烁晶体探测器，其频谱都会由于环境的变化(主要是温度)产生一定的漂移。因此，消除由于温度产生的影响就是十分必要的了。基于此，本文通过理论分析和实验研究对数字化谱仪的温度效应以及谱漂移的校正进行探讨。
毕业论文关键词：数字化谱仪；谱漂；自动稳谱
The research and design of counts weighted steady spectroscopy by digital spectrometer
Abstract: Hand-held radionuclide identification device is based on multi-channel multi-function portable spectrometer nuclear monitoring equipment that can be used to detect radionuclides, dose rate monitor, locate radioactive sources and nuclear power spectrum acquisition and nuclide identification. Its working principle is based on the measured characteristics of radionuclides γ-ray spectrum, the analysis identifies the corresponding radionuclides. It provides nuclear material detection and identification tools for crisis management, measurement and analysis tools provide radionuclide composition of radioactive contamination for consequence management.
Relative to the stationary radionuclide identification device, handheld and it’s the biggest difference is a complex work environment. Complex work environment resulted in both traditional NaI(Tl) scintillation crystal detector, or more advanced LaBr3(Ce) scintillator detector, the spectrum will be due to changes in the environment (mainly temperature) have some drift. Therefore, it is necessary to eliminate the influence of temperature. Based on this, the theoretical analysis and experimental research on digital spectrometer through temperature drift effects and spectral calibration are discussed.
Keywords: Digital spectrometer; Spectral drift; Automatic spectrum stabilization
目录
摘要 iii
Abstract iv
目录 v
1 引言 1
1.1 选题依据与研究意义 1
1.2 国内外研究现状 1
1.3 主要研究内容 2
2 便携式γ能谱仪的测量原理及仪器组成 3
2.1 γ能谱测量的基本原理 3
2.1.1 γ射线的产生 3
2.1.2 天然的γ射线 3
2.1.3 γ射线的探测 4
2.2 便携式γ能谱仪的组成 6
3 谱漂原因的分析 8
3.1 闪烁探测器 8
3.1.1 闪烁探测器的组成 8
3.1.2 闪烁探测器的工作原理 9
3.2 NaI(Tl)晶体发光原理 10
3.2.1 NaI(Tl)晶体的发光机制 10
3.2.2 NaI(Tl)晶体的发光条件 11
3.3 产生谱漂的主要原因 12
3.3.1 NaI(TI)闪烁体受温度的影响 12