Abstract:

A computation model of 14MeV neutron from the ⁶LiD convertor has been established, the 14MeV neutron sources and flux in the irradiation samples from the 6 LiD convertor and the core have been computed separately, the neutron spectrum in the irradiation samples have been computed, too. The results show that the neutron sources that over 13MeV account for 1MeV above in the 6 LiD convertor is 25.7%、24.6% respectively, 14MeV neutron sources get 4.31×10 13 n_T⋅s ⁻¹、3.34×10 13 n_T⋅s ⁻¹ , 14MeV neutron flux get 2.66×10 ¹⁰ n_T⋅cm ⁻² ⋅s ⁻¹、3.53×10 ¹⁰ n_T⋅cm ⁻² ⋅s ⁻¹ , as He and H₂O charged in the irradiation capsule.

Key words: ⁶ LiD convertor, HFETR, Irradiation sample, Fusion spectrum neutron

摘要：

建立了⁶ LiD转换器中14MeV中子源强的计算模型，对转换器不带辐照样品和分别带2、3、4个辐照样品时的中子源强进行了计算，对转换器产生的中子和来自于堆芯的中子在样品内的能谱和中子注量率进行了计算。结果表明，辐照管内充水和氦气时，辐照样品内由转换器产生的能量大于13MeV的中子分别占能量在1MeV 以上中子的25.7%、24.6%，辐照样品内由堆芯产生的能量大于13MeV的中子仅占能量在1MeV以上中子的10 ⁻⁵ 左右，样品内14MeV 中子源强分别可达4.31×10 ¹³ nT⋅s ⁻¹、3.34×10 ¹³ nT⋅s ⁻¹；中子注量率分别可达2.66 ×10 ¹⁰ n_T⋅cm ⁻²⋅s ⁻¹、3.53×10 ¹⁰ n_T⋅cm ⁻² ⋅s ⁻¹。

关键词: ⁶ LiD转换器, HFETR, 辐照样品, 聚变谱中子