# 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 ›› 2016, Vol. 27 ›› Issue (6): 128

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Verification of a fusion neutron diagnostic Bonner sphere spectrometer on measurement of a 241Am–Be neutron source

Jing Cao 1,2 • Chun-Yu Jiang 1,2 • Qing-Wei Yang 3 • Ze-Jie Yin 1,2

1. 1 State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
2 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
3 Southwestern Institute of Physics, Chengdu 610041, China
• Contact: Jing Cao E-mail:jcao@mail.ustc.edu.cn
• Supported by:

This work was supported by the National Natural Science Foundation of China (Nos. 11375195 and 11375263) and National Magnetic Confinement Fusion Science Program of China (No. 2013GB104003).

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Jing Cao, Chun-Yu Jiang, Qing-Wei Yang, Ze-Jie Yin. Verification of a fusion neutron diagnostic Bonner sphere spectrometer on measurement of a 241Am–Be neutron source.Nuclear Science and Techniques, 2016, 27(6): 128
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Abstract:

A Bonner sphere spectrometer (BSS) was developed for neutron diagnostic on HL_2A Tokamak. It contains eight polyethylene spheres embedded with SP9 3He proportional counter. Before setting up on the Tokamak experimental hall, a verification experiment was arranged on a 241Am–Be neutron source to test its spectrometry capability. The neutron response functions were calculated by Monte Carlo code Geant4 to simulate the real measurement environments. By least square method, the neutron spectrum was finally unfolded on log domain from 0.1 eV to 11 MeV. It has a remarkable consistency to the ISO 8529-1 standard 241Am–Be neutron spectrum. This shows that the BSS is effective and reliable for neutron spectrum determination.