Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2011, Vol. 22 ›› Issue (1): 39-46 doi: 10.13538/j.1001-8042/nst.22.39-46

• RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICIN • Previous Articles     Next Articles

Simulation and experimental study of a random neutron analyzing system with 252Cf neutron source

FENG Peng* LIU Siyuan WEI Biao JIN Jing MI Deling   

  1. Key Laboratory of Opto-electronics Technology & System, Ministry of Education, Chongqing University, Chongqing 400044, China
FENG Peng, LIU Siyuan, WEI Biao, JIN Jing, MI Deling. Simulation and experimental study of a random neutron analyzing system with 252Cf neutron source.Nuclear Science and Techniques, 2011, 22(1): 39-46     doi: 10.13538/j.1001-8042/nst.22.39-46

Abstract:

Experiments were performed on a high-speed online random neutron analyzing system (HORNA system) with a 252Cf neutron source (up to 1 GHz sampling rate and 3 input data channel), to obtain time- and frequencydependent signatures which are sensitive to changes in the composition, fissile mass and configuration of the fissile assembly. The data were acquired by three high-speed synchronized acquisition cards at different detector angles, source-detector distances and block sizes. According to the relationship between 252Cf source and the ratio of power spectral density, Rpsd, all the signatures were calculated and analyzed using correlation and periodogram methods. Based on the results, the simulated autocorrelation functions were utilized for identifying different fissile mass with Elman neural network. The experimental results show that the Rpsd almost remains at constant amplitude in frequency range of 0–100 MHz, and is only related to the angle and source-detector distance. The trained Elman neural network is able to distinguish the characteristics of autocorrelation function and identify different fissile mass. The average identification rate reached 90% with high robustness.

Key words: 252Cf Neutron source, Random neutron pulse signal, Ratio of power spectral density, Elman neural network, Fissile material identification