医院中子照射器装置于2007年开始建造，2008年12月完成了反应堆厂房建造，2009年3月完成了相关系统的安装和调试。2009年12月7日首次达到临界，2010年1月22日达到满功率运行。物理调试结果表明，医院中子照射器反应堆最终后备反应性为4.2 mk，满功率最大可连续运行时间为12 h，功率波动小于0.3 %；4.2 mk反应性释放实验表明，反应堆在229 s时达到85.7 kW的最大峰值功率，随后，由于燃料元件多普勒效应和慢化剂的负温度效应会非能动地把功率限制在允许的安全水平之下，反应堆具有良好的固有安全特性。

The construction of in-hospital neutron irradiator (IHNI) started in 2007. Its building construction was completed in Dec. 2008, and the installation and test of the relevant systems were completed in Mar. 2009. The first criticality was achieved on Dec. 7, 2010. The reactor reached the full power on Jan. 22, 2010. The test results show that the final excess reactivity is 4.2 mk; the maximum continuous operation time at full power is 12 h and the power wave is less then 0.3 % during full power operation; when the positive reactivity with 4.2 mk is inserted into the reactor suddenly, the power will be increased to 85.7 kW at the time of 229 s, and then, it will turn to the normal value due to the negative temperature effect.The release result of reactivity shows the inherent safety of reactor.