利用缓发中子法测量<sup>235</sup>U裂变数的实验研究

利用缓发中子法测量²³⁵U裂变数的实验研究

摘要: 缓发中子伴随核裂变产生，通过对它的测量估算核裂变数是一需实验检验的新方法。在中国原子能科学研究院微堆辐照²³⁵U样品，采用³He正比计数器测量缓发中子，并通过缓发中子数反推得到铀样品的总裂变数。利用高纯锗γ谱仪测量被辐照样品发射的缓发γ射线，通过缓发γ射线数得到样品总裂变数。对两种测量方法得到的结果进行了对比和分析，结果表明，用缓发中子法和缓发γ法对同一样品测量的结果一致，缓发中子法可作为一种辅助诊断方法。

Abstract: The delayed neutron is emitted after one fission product generated. A new method evaluating fission number by the measurement of delayed neutron number is needed to be verified by experiment. ²³⁵U samples were irradiated with MNPR at CIAE, the delayed neutrons were measured with ³He proportional detector and the fission number was determined. The result was verified by delayed γ method. The delayed neutron method is a supplementary way for delayed γ method.