合肥国家同步辐射实验室核物理实验区的辐射屏蔽设计和防护评价

SHIELDING PROJECT AND PROTECTION ASSESSMENT OF A EXPERIMENTAL AREA FOR NUCLEAR PHYSICS IN HEFEI NATIONAL SYNCHROTRON RADIATION LABORATORY

本文主要介绍合肥国家同步辐射实验室(HNSRL)核物理实验区辐射屏蔽计算的方法及结果。对能量为400MeV、束流功率为6 kW 的电子束轰击靶时产生的轫致辐射和次级中子进行屏蔽计算;估算了靶室顶部次级中子的天空反射对周围辐射水平的影响;对靶室内的感生放射性气体(主要是^(13)N)的浓度进行了估计,确定了排放烟囱的高度。文中对靶室和核物理实验大厅提出了设置局部屏蔽和防护门等防护措施。

This paper presents the methods and results of radiationshielding calculations in the experimental area for nuclear physics in HefeiNational Synchrotron Radiation Laboratory(HNSRL).The shields forbremsstrahlung and secondary neutron produced by interactions between400 MeV electrons of beam power of 6 kW and target were calculated.Thesurrounding radiation level induced by the sky shine of secondaryneutrons which get out from the roof of target chamber was evaluated.Theradioactive concentration of ^(13)N gas in target chamber was estimated andthus the height of exhausting chimney was determined.The proposedprotective measures for target chamber and experimental hall,such as settingup local shielding and protective door etc.,were aiso suggested.