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....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 of60 Co 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.展开更多
2018年8月2～3日中国安徽合肥主办：北京食品科学研究院中国食品杂志社《食品科学》杂志中国食品杂志社《Food Science and Human Wellness》杂志国际谷物科技学会（ICC）共同主办：合肥工业大学食品科学与工程学院安徽农业大学茶树生...2018年8月2～3日中国安徽合肥主办：北京食品科学研究院中国食品杂志社《食品科学》杂志中国食品杂志社《Food Science and Human Wellness》杂志国际谷物科技学会（ICC）共同主办：合肥工业大学食品科学与工程学院安徽农业大学茶树生物学与资源利用国家重点实验室南京财经大学食品科学与工程学院华美食品学会（CAFS）支持协办：美国国际谷物化学家学会（AACCI）《Journal of Food Science》杂志（SCI收录）.展开更多
2018年8月2～3日中国安徽合肥主办：北京食品科学研究院中国食品杂志社《食品科学》杂志中国食品杂志社《Food Science and Human Wellness》杂志国际谷物科技学会（ICC）共同主办：合肥工业大学食品科学与工程学院安徽农业大学茶树生...2018年8月2～3日中国安徽合肥主办：北京食品科学研究院中国食品杂志社《食品科学》杂志中国食品杂志社《Food Science and Human Wellness》杂志国际谷物科技学会（ICC）共同主办：合肥工业大学食品科学与工程学院安徽农业大学茶树生物学与资源利用国家重点实验室南京财经大学食品科学与工程学院支持协办：展开更多
基金Supported by the National Natural Science Foundation of China(Nos.11175180 and 11175182)
文摘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 of60 Co 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.
文摘2018年8月2～3日中国安徽合肥主办：北京食品科学研究院中国食品杂志社《食品科学》杂志中国食品杂志社《Food Science and Human Wellness》杂志国际谷物科技学会（ICC）共同主办：合肥工业大学食品科学与工程学院安徽农业大学茶树生物学与资源利用国家重点实验室南京财经大学食品科学与工程学院华美食品学会（CAFS）支持协办：美国国际谷物化学家学会（AACCI）《Journal of Food Science》杂志（SCI收录）.
文摘2018年8月2～3日中国安徽合肥主办：北京食品科学研究院中国食品杂志社《食品科学》杂志中国食品杂志社《Food Science and Human Wellness》杂志国际谷物科技学会（ICC）共同主办：合肥工业大学食品科学与工程学院安徽农业大学茶树生物学与资源利用国家重点实验室南京财经大学食品科学与工程学院支持协办：
