Atomic Energy Science and Technology ›› 2021, Vol. 55 ›› Issue (12): 2351-2358.

### Study on Residual Radioactivity Evaluation of ps Laser Beam Line of XG-Ⅲ Device

WEI Shuoyang;QIU Rui;YANG Bo;SONG Honghu;ZHOU Shengsheng;ZHANG Zhimeng;ZHOU Weimin;MA Chi;ZHANG Hui;LI Junli

1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China; Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Beijing 100084, China; Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
• Online:2021-12-20 Published:2021-12-20

### XG-Ⅲ装置ps激光束线所致感生放射性评估研究

1. 清华大学 工程物理系，北京100084；粒子技术与辐射成像教育部重点实验室，北京100084；中国工程物理研究院 激光聚变研究中心 等离子体物理重点实验室，四川 绵阳621900

Abstract: The PIC and Monte Carlo simulation methods were used to evaluate the dose of Xray source and neutron source driven by the ps laser beam line of the XGⅢ device. After using PIC to determine the highenergy electron source term, it was used as input data of Monte Carlo software FLUKA to obtain the residual radioactivity and the residual dose around different targets at different time after the experiment. The simulation results show that for the laserdriven bremsstrahlung Xray source, after the experiment is completed and cooled for 10 min, the residual dose rate at 1 cm from the target surface is about 4 mSv/h, and 15 μSv/h at 30 cm from target surface. For the photoneutron source generated by the laserdriven photonuclear reaction, the residual dose rate at 1 cm from the target surface is less than 10 μSv/h after the experiment is completed and cooled for 10 min. In addition to the type of target material, the variation of the residual dose rate around the target will also be affected by the thickness of the target. Therefore, in different irradiation environments, it is necessary to adopt different radiation protection schemes for targets with different materials and thicknesses. The results of this study can provide relevant reference for radiation risk analysis of protective measures of ultrashort ultraintense laser facility.