示踪核素比活度在其不确定度范围内的变化对CIEMAT/NIST方法测量结果的影响  

Influence of Tracer Nuclide Specific Activity Variation in Its Uncertainty Range on CIEMAT/NIST Method Results

作　　者：张明[1] 刘皓然[2] 梁珺成[1] 杨元第[1] 陈靖[1] 

机构地区：[1]中国计量科学研究院,北京100013 [2]中国原子能科学研究院,北京102413

出　　处：《原子能科学技术》2012年第11期1393-1396,共4页Atomic Energy Science and Technology

摘　　要：在中国计量科学研究院电离辐射研究所的双管符合液闪分析仪上,开展放射性医用核素99 Tcm比活度的实验测量,并深入研究CIEMAT/NIST方法中由于示踪核素3 H比活度自身不确定度对实验结果带来的影响。实验结果表明,液闪系统的通用曲线(自由参数随淬灭指示参数tSIE变化的曲线)对示踪核素比活度较敏感,进而会影响到被测核素99 Tcm的探测效率和比活度测量值。对于采用扩展不确定度为3%的3 H示踪核素,当其比活度在其不确定度范围内发生变化时,最终测量得到的99 Tcm比活度有近1%的变化。By using the double coincidence liquid scintillation counter at the National Institute of Metrology, the influence of the tracer nuclide specific activity uncertainty on the results by the CIEMAT/NIST method was further investigated through the specific activity of radioactive medical nuclide 99Tcm. The experimental results reveal that the obtained universal curve (curve of free parameter versus the quench indicating parameter tSIE) is sensitive to the specific activity of tracer nuclide 3H, and brings effects to the counting efficiency and specific activity of 99Tcm. For the case of tracer nuclide specific activity with the uncertainty of 3%, the measured specific activity of 99Tcm has a variation of 1%.

关 键 词：99Tcm核素 CIEMAT/NIST方法 比活度 

分 类 号：TL816.2[核科学技术—核技术及应用]