医院中子照射器反应堆实验研究

Physics Experimental Study for Reactor of In-hospital Neutron Irradiator

摘要: 医院中子照射器是专用于硼中子俘获治疗的核装置，所用反应堆功率为30 kW，采用²³⁵U富集度为12.5%的UO₂为燃料，金属铍反射层，轻水为慢化剂和冷却剂。堆芯产生的热量靠自然循环冷却。在反应堆堆芯相对两侧分别设置了热中子束流和超热中子束流，用于治疗患者。在微堆零功率实验装置上，完成了临界质量、控制棒效率、上铍反射层效率及其它部件反应性的测量，确定了最终燃料元件的装载，为工程物理启动提供实验数据。

Abstract: In-hospital neutron irradiator (IHNI) is specially designed for boron neutron capture therapy (BNCT). The reactor with thermal power 30 kW is an undermoderated reactor of pool-tank type, and UO₂ with enrichment of 12.5% as fuel, light water as coolant and moderator, and metallic beryllium as reflector. The fission heat produced by the reactor is removed by the natural convection. On the both sides of the reactor core, there are two neutron beams, one is thermal neutron beam, and the other opposite to the thermal beam, is epithermal neutron beam. The critical mass, worth of the control rod, worth of the top Be reflectors, and other component worth were measured on the zero power experiment equipment of miniature neutron source reactor.