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Decommissioning analysis of the scrapers in the NSRL Linac using depth profiling 作者： HE Li-Juan 1 LI Yu-Xiong 1 LI Wei-Min 1 CHEN Yu-Kai 1 REN Guang-Yi 1 作者单位： 1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China 提交时间： 2023-06-18 摘要: For a high-energy electron facility, estimates of induced radioactivity in materials are of considerable importance to ensure that the exposure of personnel and the environment remains as low as reasonably achievable. In addition, accurate predictions of induced radioactivity are essential to the design, operation, and decommissioning of a high-energy electron linear accelerator. In the case of the 200-MeV electron linac of the National Synchrotron Radiation Laboratory (NSRL), the electrons are accelerated by five acceleration tubes and collimated by copper scrapers. The scrapers, which play a vital role in protecting the acceleration cavity, are bombarded by many electrons over a long-term operation, which causes a significant amount of induced radioactivity. Recently, the NSRL Linac is the first high-energy electron linear accelerator in China to be out of commission. Its decommissioning is highly significant for obtaining decommissioning experience. This paper focuses on the measurement of induced radioactivity on the fourth scraper, where the electron energy was 158 MeV. The radionuclides were classified according to their half-lives. Such a classification provides a reliable basis for the formulation of radiation protection and facility decommissioning. To determine the high-radioactivity area and to facilitate the decommissioning process, the slicing method was applied in this study. The specific activity of 60Co in each slice was measured at a cooling time of ten months, and the results were compared with the predictions generated by Monte Carlo program FLUKA. The trend of the measured results is in good agreement with the normalized simulation results. The slicing simulation using Monte Carlo method is useful for the determination of high-radiation areas and proper material handling protocols and, therefore, lays a foundation for the accumulation of decommissioning experience. NSRL Linac Decommissioning Scraper 60 Co Slicing method 期刊： Nuclear Science and Techniques 分类： 核科学技术 >> 粒子加速器 投稿状态： 已在期刊出版 引用： ChinaXiv:202306.00224 (或此版本 ChinaXiv:202306.00224V1 ) DOI:dx.doi.org/10.13538/j.1001-8042/nst.26.060103 CSTR:32003.36.ChinaXiv.202306.00224.V1 推荐引用方式： HE Li-Juan,LI Yu-Xiong,LI Wei-Min,CHEN Yu-Kai,REN Guang-Yi.(2023).Decommissioning analysis of the scrapers in the NSRL Linac using depth profiling.Nuclear Science and Techniques.doi:dx.doi.org/10.13538/j.1001-8042/nst.26.060103 版本历史 [V1] 2023-06-18 18:11:12 ChinaXiv:202306.00224V1 下载全文