Comparative study of a GEM-based fast neutron detector using⁴HE/CO<inf>2</inf>and⁴HE/CO<inf>2</inf>/C<inf>4</inf>H<inf>10</inf>gas mixtures

• Main Authors: Kiadtisak Saenboonruang, Anawat Rittirong
• Format: Journal
• Published: 2018
• Subjects: Biochemistry, Genetics and Molecular Biology; Chemistry; Materials Science; Mathematics; Agricultural and Biological Sciences
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85030659912&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/43617
• Institution: Chiang Mai University

© 2017, Chiang Mai University. All rights reserved. 1 H- or 4 He-contained gas mixtures are usually used to detect fast neutrons, which relies on elastic scattering between fast neutrons and light gas molecules. In this research, gas mixtures of 4 He/CO 2 (80:20 and 70:30) and 4 He/CO 2 /C 4 H 10 (70:23:7) were flowed through a 10 cm□ 10 cm triple-Gas Electron Multiplier (GEM) detector at a constant flow rate of 3.0 L/hr in order to detect fast neutrons. Comparisons of relative efficiencies, relative gains, and detection uniformity for all gas types were investigated by measuring signal counts and signal amplitudes. Results showed that a gas mixture of 4 He/CO 2 (80:20) had the highest relative efficiency and relative gains amongst all gas mixture types. In terms of detection uniformity, detection efficiency at the center of the active area was approximately 20% higher than areas close to the detector edges. Details of basic knowledge of GEM, experimental procedures, results and discussion are included in this article.