基于NaI(Tl)探测器γ能谱反演.ppt

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1、基于NaI(Tl)探测器的γ能谱反演陈伟西北核技术研究所主要内容引言技术现状几种能谱反演方法结束语基于NaI(Tl)探测器的γ能谱反演，西北核技术研究所，陈伟引言(1)NaI(Tl)HPGe液氮对γ射线非常灵敏探测效率高使用方便分辨率高保障不便售价高基于NaI(Tl)探测器的γ能谱反演，西北核技术研究所，陈伟引言(2)HPGe测得快达不到NaI(Tl)反演NaI(Tl)基于NaI(Tl)探测器的γ能谱反演，西北核技术研究所，陈伟技术现状(1)国内：直接解调法国外：GoldMAP(MaximumAPosteriori)MEM(MaximumEntropyMethod)M

2、SNV(MinimizationofSquaresofNegativeValues)ML-EM(MaximumLikelihoodEstimationusingExpectationMaximisation)基于NaI(Tl)探测器的γ能谱反演，西北核技术研究所，陈伟技术现状(2)直接解调法2005，碲锌镉探测器γ能谱解析。2010，航空γ能谱解析。Gold2004,Gammasphereγ能谱重构。2010，环形切伦科夫成像仪的二维能谱重构。ML-EM2009，水下NaI(Tl)监测系统γ能谱反演。2012，写入SDAT软件，进行氙同位素分析。基于NaI(Tl)探测

3、器的γ能谱反演，西北核技术研究所，陈伟几种能谱反演方法(1)ML-EMγ射线能量/MeV全能峰峰位/MeV峰面积反演前反演后峰位差反演前反演后相对偏差0.6000.6000.599-0.0011.706E+041.765E+043.46%0.6460.6480.6490.0016.820E+036.642E+03-2.61%0.6940.6940.691-0.0031.023E+049.901E+03-3.22%0.7440.7440.742-0.0023.404E+032.641E+03-22.41%0.7960.7970.796-0.0012.730E+042.7

4、37E+040.26%1.2001.2011.20101.693E+031.642E+03-3.01%1.2681.2691.2730.0042.388E+042.425E+041.55%1.3371.3361.3380.0023.072E+043.059E+04-0.42%1.4091.4091.4250.0162.731E+042.693E+04-1.39%1.4821.4821.5110.0293.399E+032.790E+03-17.92%10000次迭代几种能谱反演方法(2)直接解调法10000次迭代γ射线能量/MeV全能峰峰位/MeV峰面积反演前反演后峰

5、位差反演前反演后相对偏差0.6000.6000.599-0.0011.706E+041.741E+042.05%0.6460.6480.647-0.0016.820E+036.510E+03-4.55%0.6940.6940.69401.023E+041.005E+04-1.76%0.7440.7440.742-0.0023.404E+032.897E+03-14.89%0.7960.7970.796-0.0012.730E+042.758E+041.03%1.2001.2011.192-0.0091.693E+031.353E+03-20.08%1.2681.269

6、1.264-0.0052.388E+042.395E+040.29%1.3371.3361.335-0.0013.072E+043.056E+04-0.52%1.4091.4091.4220.0132.731E+042.741E+040.37%1.4821.4821.5040.0223.399E+033.018E+03-11.21%几种能谱反演方法(3)Gold经典GoldOne-foldGoldγ射线能量/MeV全能峰峰位/MeV峰面积反演前反演后峰位差反演前反演后相对偏差0.6000.6000.599-0.0011.706E+041.745E+042.28%0.6

7、460.6480.646-0.0026.820E+036.636E+03-2.69%0.6940.6940.69401.023E+041.019E+04-0.38%0.7440.7440.742-0.0023.404E+032.970E+03-12.70%0.7960.7970.796-0.0012.730E+042.760E+041.09%1.2001.2011.195-0.0061.693E+031.404E+03-17.10%1.2681.2691.267-0.0022.388E+042.403E+040.61%1.3371.3361.3380