基于衰变链计算的裂变产物缓发γ能谱分析

Analysis of Delayed Gamma Spectrum of Fission Product Based on Decay Chain Calculation

摘要: 在军控核查技术中，缓发γ能谱是核材料的“指纹”。为计算和分析铀裂变产物的缓发γ能谱，本文将各种类型的衰变链简化为基态线性链和激发态线性链，推导了零时前后各级核素数目的变化公式，建构了计算缓发γ射线能谱的C语言程序代码，并通过实验对理论推导进行了验证。通过分析几种核素的缓发γ射线计数发现，计算结果与实验数据吻合较好。

Abstract: Delayed gamma spectrum is the fingerprint of uranium materials in the arms control verification technology. The decay chain was simplified into basic state linear chain and excitation state linear chain to calculate and analyze the delayed gamma spectra of fission products. Formulas of the changing rule for nuclide number before and after zero-time were deduced. The C program for calculating the delayed gamma spectrum data was constructed, and related experiments were conducted to verify these formulas. Through analysis of the delayed gamma counts of several nuclides, the calculated results are found to be consistent with experimental values.