改进球壳钚样品基体效应的FNMC

IF 0.4 4区工程技术 Q4 NUCLEAR SCIENCE & TECHNOLOGY

Kerntechnik Pub Date : 2022-05-17 DOI:10.1515/kern-2021-0019

S. Hou, Ji-jun Luo

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引用次数: 0

摘要

快中子多重计数(FNMC)测量得到的裂变质量如果不考虑放射源的基体自吸收效应，会被低估。在分析FNMC方程的基础上，建立了一套FNMC系统，对不同形状、不同质量条件下空心球(球壳)钚的质量属性进行了模拟研究。Geant4仿真结果表明，适当的参数校正可以有效地消除由于矩阵效应而产生的偏差。通过对检测效率和多重计数率的分析，对仿真结果中的自倍增系数、α系数和散射串扰进行了校正，得到了相应的多项式拟合方程。在此区间内，样品的校正质量偏差小于±1%。结果表明，FNMC与参数校正相结合可以准确测量样品的质量属性，为解决类似问题提供了一种新的方法。

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Improving FNMC for the matrix effect of spherical shell plutonium samples

Abstract The fissile mass deduced from fast neutron multiplicity counting (FNMC) measurement is underestimated if the matrix self-absorption effect of the radioactive source is not taken into account. Based on the analysis of FNMC equations, a set of FNMC system was built to simulate and study the mass attribute of the hollow sphere (spherical shell) plutonium under different shapes and different masses conditions. Geant4 simulation shows that an appropriate parameter correction successfully removes the bias because of the matrix effect. Consequently, the self-multiplication factor, α coefficient and scattering crosstalk of the simulation result were corrected after analyzing the detection efficiency and multiplicity counting rate, and the corresponding polynomial fitting equation was obtained. The corrected mass deviation of samples was less than ±1% in this interval. The results show that the combination of the FNMC and parameter correction can accurately measure the sample mass attribute, which provides a new method for solving similar problems.

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来源期刊

Kerntechnik 工程技术-核科学技术

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Kerntechnik is an independent journal for nuclear engineering (including design, operation, safety and economics of nuclear power stations, research reactors and simulators), energy systems, radiation (ionizing radiation in industry, medicine and research) and radiological protection (biological effects of ionizing radiation, the system of protection for occupational, medical and public exposures, the assessment of doses, operational protection and safety programs, management of radioactive wastes, decommissioning and regulatory requirements).