硼中子俘获治疗(Boron Neutron Capture Therapy,简称BNCT)通过在肿瘤细胞内中子的(n,α)反应来杀死癌细胞。中子源的产生是通过一微型反应堆实现的,本文简要介绍医用中子照射器的屏蔽设计,包括放射性源项计算,以及堆本体、工艺间、大厅、分析室、观察室等的屏蔽设 Boron Neutron Capture Therapy (BNCT) kills cancer cells by (n, α) reactions of neutrons in tumor cells. The production of neutron source is realized through a microreactor. This article briefly introduces the shielding design of medical neutron irradiator, including the calculation of radioactive sources, and the shielding of stack body, process room, hall, analysis room and observation room