2026年“核理安邦”联合博士生学术论坛

Analysis of gadolinium concentration in solutions based on photoneutrons’ lifetime measurement

Not scheduled

1h

地址：清华大学校内

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Speaker

民锋 於

Abstract

In spent nuclear fuel reprocessing, neutron poisons are usually added to the spent nuclear fuel solution for maintaining the solution in subcritical state. Gadolinium nitrate is a widely used neutron poison, and its concentration should be exactly known for spent nuclear fuel reprocessing. In this study, an e-LINAC driven photoneutron source based gadolinium concentration monitoring method is proposed to measure the gadolinium concentration by analyzing the lifetime of photoneutrons in gadolinium solutions. Monte Carlo simulation and experimental results are both presented and discussed. The results demonstrate this method works well for measuring gadolinium concentration within the range of 0.1g/L~ 1.0 g/L.

摘要

在乏核燃料再处理过程中，通常会在乏核燃料溶液中添加中子毒剂，以使溶液保持在亚临界状态。硝酸钆是一种广泛使用的中子毒剂，在乏核燃料再处理过程中必须精确测定其浓度。本研究提出了一种基于电子直线加速器驱动的光中子源的钆浓度监测方法，通过分析钆溶液中光中子的寿命来测定钆浓度。文中呈现并讨论了蒙特卡洛模拟与实验结果。结果表明，该方法在0.1 g/L至1.0 g/L的浓度范围内对钆浓度的测定效果良好。