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采用飞行时间法测量了西安脉冲堆热柱孔道热中子束流中子能谱分布,能谱测量结果较Thermal Maxwellian理论谱偏软,中子谱平均能量为0.042±0.01eV。采用金箔活化法测得热柱孔道出口前端热中子注量率为1.18×105 cm-2.s-1,热中子注量率测量的不确定度为3%。
The neutron energy distribution of thermal neutron beam in Xi’an pulsed heat reactor column was measured by time-of-flight method. The energy spectrum was softer than that of Thermal Maxwellian theory, and the average energy of neutron spectrum was 0.042 ± 0.01eV. Using the gold foil activation method, the thermal neutron fluence rate at the exit of the thermal column was 1.18 × 105 cm-2 s-1, and the uncertainty of the thermal neutron fluence measurement was 3%.