原子能科学技术2017，Vol.51Issue(5)：769-774,6.DOI:10.7538/yzk.2017.51.05.0769
贝叶斯理论在脉冲裂变中子能谱诊断中的应用
Application of Bayesian Theory in Diagnosis of Pulsed Fission Neutron Energy Spectrum
摘要
Abstract
To figure out the problem of neutron energy spectrum measurement in pulsed fission, a numerical iteration method for neutron energy spectrum based on Bayesian theory was established in this paper.The spatial transport, material attenuation and detector sensitivity were analyzed.In the proposed method, the broadened time-of-flight spectrum was regarded as the probability distribution function of off-shell time spectrum at different measuring points.The signal intensity distribution of pulsed neutron at different measuring points is the convolution of off-shell time spectrum and the broadened time-of-flight spectrum.The impact factor of the conversion process, such as material attenuation and detector sensitivity, on neutron energy spectrum was disposed, respectively.The influences of several factors, including neutron energy spectrum attenuation by channel materials and non-linear detector sensitivity, on the unfolding of the neutron energy spectrum were eliminated.The result shows that the ideal pulsed fission neutron spectrum can be obtained after the numerical treatment for the neutron waveforms with the distance of 5 m and 10 m from the radiation source, respectively.When taking into consideration of the effect of the response function for the transmission system to the neutron waveform, the relative ideal neutron spectrum can still be obtained.关键词
中子能谱/脉冲裂变/贝叶斯理论/逆卷积Key words
neutron energy spectrum/pulsed fission/Bayesian theory/deconvolution分类
能源科技引用本文复制引用
谢红卫,龚建,王立宗..贝叶斯理论在脉冲裂变中子能谱诊断中的应用[J].原子能科学技术,2017,51(5):769-774,6.基金项目
中国工程物理研究院科学技术发展基金资助项目(2014A0103002) （2014A0103002）
