| 张富利,曲德成,杨国山,等.蒙特卡罗方法在γ谱测量中效率刻度的研究[J].中华放射医学与防护杂志,2009,29(4):432-434,448.ZHANG Fu-li,QU De-cheng,YANG Guo-shan,et al.An efficiency calibration method without a radioactive source using BOMAB phantom and Monte Carlo simulation for Inspector 2000 gamma spectroscopy system[J].Chin J Radiol Med Prot,2009,29(4):432-434,448 |
| 蒙特卡罗方法在γ谱测量中效率刻度的研究 |
| An efficiency calibration method without a radioactive source using BOMAB phantom and Monte Carlo simulation for Inspector 2000 gamma spectroscopy system |
| 投稿时间：2009-04-24 |
| DOI： |
| 中文关键词: 蒙特卡罗模拟 便携式γ谱仪 无源效率刻度 |
| 英文关键词:Monte Carlo simulation Portable gamma spectroscopy system Efficiency calibration without a radioactive source |
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| 中文摘要: |
| 目的 建立探测器的无源效率刻度方法。方法 利用137Cs点源,对HPGe和NaI晶体尺寸进行调整以获得正确的探测器几何参数,基于BOMAB体模的数学模型,在γ线能量126～1836 keV范围内,采用蒙特卡罗方法,结合核应急情况下体内核素探测几何模式,分别计算了HPGe探测器和NaI探测器对BOMAB体模的计数效率,根据计算结果拟合出相关的效率曲线和函数。结果 通过拟合函数计算获得的探测效率与应用蒙特卡罗算法得到的探测效率一致性较好。对于NaI探测器,残差为-19%～18%;对于HPGe探测器,残差为-11%～17%。结论 根据BOMAB体模的数学模型应用蒙特卡罗方法对便携式γ谱仪进行无源刻度省时、省力,具有较强的可操作性,是一种非常方便的谱仪校准方法。 |
| 英文摘要: |
| Objective To establish an efficiency calibration method without a radioactive source for Inspector 2000 gamma spectroscopy system. Methods At the first step, geometry parameters of the detector were properly specified by comparisons of FEPE (Full Energy Peak Efficiency) between Monte Carlo(MC) calculations and the average measured values of HPGe and NaI detectors using point sources(137Cs). The differences between calculations and measurements were generally within±10% for gamma rays. Then,Monte Carlo simulation was used to evaluate the counting efficiency of NaI(Tl) and HPGe detectors for BOMAB phantoms. Corresponding efficiency curves and functions were fitted. Results The counting efficiency received from the fitted efficiency functions had a good agreement with those from MC simulation. The bias for NaI detector ranged from -19% to 18%, while the bias for HPGe detector ranged from -11% to 17%. The above errors were totally acceptable in the on-site deployment during nuclear and radiological emergency events. ConclusionsMonte Carlo method is simple,time and laborsaving in determing the counting efficiency of gamma spectroscopy system. |
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