Calculation and reporting of total uncertainties are essential criteria in the nuclear industry since measured results are used in decision making. Plutonium isotopic compositions (Pu IC) in different matrices are required at various stages of a close-loop nuclear fuel cycle. Under- and/or over-estimating uncertainties in Pu IC may result in avoidable radiological emergencies. In this work, we present the uncertainty budget for Pu IC determination using 120–450 keV gamma emission lines recorded with an HPGe. Detailed uncertainty propagation equations based on the propagation of partial derivatives are constructed and solved. Effects of the individual uncertainties on the total uncertainty are studied for different counting durations starting from 5 min up to 24 h. Results are compared with TIMS results and the theoretically calculated uncertainties were verified with multiple experimental data.

中文翻译：

---

γ谱法计算Pu同位素组成中的不确定度传播：理论与实验

总不确定度的计算和报告是核工业的基本标准，因为在决策中使用了测量结果。在闭环核燃料循环的各个阶段，需要不同基质中的iso同位素组成（Pu IC）。低估和/或高估Pu IC的不确定性可能导致可避免的放射紧急情况。在这项工作中，我们提出了使用HPGe记录的120–450 keV伽马发射谱线确定Pu IC的不确定性预算。构造并求解了基于偏导数传播的不确定度传播方程。对于从5分钟到24小时的不同计数持续时间，研究了各个不确定性对总不确定性的影响。