Experimental study of a "fission electron-collection" detector with thermal neutrons. (November 2021)

• Record Type: Journal Article
• Authors: Wang, Dong; Peng, Xingyu; Si, Fenni; Cai, Yiping; Yang, Biao; Xi, Zhiguo; Chen, Qiping; Hu, Qingyuan; Zhu, Xuebin; Wang, Lizong; Zhang, Yimo; Zhang, Chuanfei
• Is Part Of: Radiation physics and chemistry. Volume 188(2021)
• Publication Date: 2021-11
• Subjects: Fission electron-collection -- Neutron detector -- MC simulations -- Thermal neutrons -- High voltage; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2021.109570
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: The "fission electron-collection" neutron detector (FECND) is a fission-based neutron detector which has simple structure and could be used as a passive detector. In this work, a FECND prototype is fabricated and studied with thermal neutrons from a reactor. Due to the low sensitivity of FECND, the fission coat with an diameter of 93 mm and a 235 U mass thickness of 1 mg/cm 2 was electroplated on the coated electrode of the prototype to obtain a robust signal. The experimental results indicate that the sensitivity of the prototype to thermal neutrons is 2.8 × 10 −18 C·cm 2 and 1.3 × 10 −18 C·cm 2 without a high voltage when the electrodes gap is 30 mm and 15 mm respectively. The sensitivities for various applied voltages are also provided for the two gaps. The data show that the both sensitivities were increased to about 1.0 × 10 −17 C·cm 2 after a high voltage of one hundred volts was applied, and a higher voltage up to 4 kV would not increase the sensitivity distinctly. The impacts of different electrode gaps and various applied voltages are discussed. Highlights: Design and develop a prototype of "fission electron-collection" neutron detector. Give the validation and verification of the prototype through utilizing thermal neutrons. Give the sensitivities for different electrode gaps and various applied voltages. Discuss the impacts of different electrode gaps and various applied voltages.