An improved non-destructive assay method for radioactive waste steel boxes based on tomographic gamma scanning

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2026-06-01 Epub Date: 2026-01-31 DOI:10.1016/j.nima.2026.171322

Xi Huang , Kaiming Yuan , Hua Chen , Jinhui Qu , Zihang Song , Yonggang Yuan , Zhaoyi Tan

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引用次数: 0

Abstract

Non-destructive assay (NDA) plays a pivotal role in radioactive waste management, which can provide the crucial basis for radioactive waste safe classification, proper storage, and scientific disposal. In this paper, an improved non-destructive assay method for radioactive waste steel box is introduced. Given the large size and thickness of the steel box, the emission measurements of tomographic gamma scanning (TGS) was employed. The transmission measurements were replaced by Monte Carlo calculations based on the density of the uniform medium, to simplify the acquisition of the response matrix. The system response matrix library is pre-calculated to realize the adaptive calculation of activity reconstruction under different densities. In the actual experiments, three high-purity germanium (HPGe) detectors mounted on the measurement support platform were used to efficiently measure the full-energy peak counting rate of target nuclides. Based on the Boosted-Gold algorithm, the reconstruction of the radioactive waste activity distribution in steel box was accomplished. The errors in the actual activity measurement are less than 35% and 50% in uniform media (air, water and sand) and non-uniform medium (aluminum components), respectively. Moreover, the reconstructed activity distribution shows a high degree of consistency with the actual activity distribution. These results validate the capability of the proposed method and fully meet the requirements of non-destructive assay of radioactive waste steel box.

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一种改进的基于层析伽马扫描的放射性废钢箱无损检测方法

无损检测在放射性废物管理中起着举足轻重的作用，为放射性废物的安全分类、合理贮存和科学处置提供了重要依据。本文介绍了一种改进的放射性废钢箱无损检测方法。考虑到钢盒的尺寸和厚度较大，采用层析伽马扫描（TGS）发射测量。传输测量被基于均匀介质密度的蒙特卡罗计算取代，以简化响应矩阵的获取。预计算系统响应矩阵库，实现不同密度下活度重建的自适应计算。在实际实验中，利用安装在测量支撑平台上的3个高纯锗（HPGe）探测器，高效地测量了目标核素的全能峰值计数率。基于boosting - gold算法，实现了钢箱内放射性废物活度分布的重建。在均匀介质（空气、水和沙子）和非均匀介质（铝构件）中，实际活度测量误差分别小于35%和50%。重建的活度分布与实际活度分布具有较高的一致性。实验结果验证了该方法的有效性，完全满足放射性废钢箱无损检测的要求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.