【摘要】 用较高效率的￣（３）Ｈｅ长计数器测量了钚半球壳的自发裂变中子，并与ＢＦ＿３长计数器的实验结果进行了比较，研究了￣（３）Ｈｅ长计数器的探测灵敏度，通过实验，探讨了弱中子的探测技术。更多还原

【Abstract】 Spontaneous fission neutrons of the ￣（239）pu hemispherical shell have been measured with the ￣（3）He longcounter of higher efficiency. The experimental results were compared to the experimental ones from the BF₃ longcounter, The detecting sensitivity of the￣（3）He long counter has been obtained. By the experiment,the detectingtechnology of weak neutrons has been studied. (更多还原