低水平特征放射性核素的识别和干扰因素剔除

Identification of low level characteristic radionuclides and elimination of the interfering facors

目的 提出了微粒态空气低水平特征放射性核素识别和干扰因素剔除方法 ,为监测核事件释放的放射性核素提供可靠的依据。方法 介绍了γ能谱分析中特征放射性核素的识别技术 ,探讨了其他可能的干扰因素及其剔除方法 ,列举了γ能谱的最小可测量活度和灵敏阈值的计算方法。结果 用本方法识别出了 2个国际比对样品中包含的全部特征核素 ,给出的测量值与IAEA的参考值非常接近。结论 提出的低水平特征放射性核素的识别和监测方法是可信和可靠的。

Objective For providing the reliable evidences in monitoring a radionuclide released events,the techniques of identifying the characteristic radionuclides and its elimination of the interfering facors be promoted in a low level particulate air samples. Methods the methods for identifying characteristic radionuclides be introduced when the γ-ray spectrum is being analyzed,other interfering factors and their elimination methods be discussed,the calculation methods of minimum detectable activity and/or the sensitive threshold be listed. Results All of the radionuclides contained in two intercomparison samples had be identified,and our measurement results are closed to the reference values announced by IAEA. Conclusion As a results of tests in two intercomparison on radionuclids measurements organized by IAEA in 2002,it have proved that the methods introduced in the paper is creditable and reliable. ;