中文摘要：

在启明星1#次临界装置上进行了次临界外推实验,外中子源分别采用Am-Be中子源和^252Cf中子源,放置在启明星1#次临界装置中心,中子探测器放置在次临界装置内不同位置,研究相对中子计数率的变化。实验测量结果表明：在启明星1#次临界装置不同位置的探测器测量得到的中子计数率变化不同,但对外推结果影响不大。

英文摘要：

Relative neutron count rate change was studied on Venus 1# sub-critical assembly for the detectors at different positions of the core with external neutron source,Am-Be neutron source and ^252Cf neutron source respectively.The experimental results show that neutron count rate changes for the detectors at different positions are different on Venus 1# sub-critical assembly,but it’s little effect on the results of sub-critical extrapolate experiment.