基于核试验监测数据的模拟γ能谱分析国际能力验证

International Proficiency Test of Stimulatedγ-ray Spectrum Analysis Based on Nuclear Test Monitoring Data

本文介绍了全面禁止核试验条约(CTBT)筹委会临时技术秘书处(PTS)组织的2003年度国际放射性核素实验室能力验证过程。PTS在真实核试验监测数据基础上,通过模拟产生了2003年度能力验证活动的参考γ能谱,能谱中添加了24种裂变产物、5种活化产物和5种天然放射性核素。北京放射性核素实验室分析出了其中的27种核素,核素活度及其活度浓度分析结果与参考值在不确定度范围内一致。利用^(95)Zr和^(95)Nb活度比计算了核事件的零时,与参考值仅相差0.26 d。根据参考谱中裂变产物和活化产物信息,指出裂变产物应主要由^(238)U和^(239)Pu裂变产生,参考谱应源自真实核试验的监测数据。

The whole process of 2003 proficiency test exercise(PTE2003)organized by the Provisional Technical Secretary of Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty was described.The PTE2003 reference spectrum was produced by Monte Carlo simulation based on the monitoring data analysis of a real atmospheric nuclear test.The spectrum consisted of 24 fission products,5 activation products and 5 nature radionuclides.Total 27 out of 34 radionuclides were identified by Beijing Radionuclide Laboratory,and the activities are in agreement with the reference values.The zero time determined by the^(95)Nb and^(95)Zr activity ratio is very close to the reference value,and the deviation is only 0.26 d.According to analysis results of the reference spectrum,it was pointed out that the fission products should be generated mainly through^(238)U and^(239)Pu fission and the reference spectrum should be original from the real nuclear test monitoring data.