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The BC-704 scintillation screen with light readout by wavelength shifting fibers as a highly efficient neutron detector

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6 Author(s)
J. Iwanowska ; National Centre for Nuclear Research, PL 05-400 Swierk-Otwock, Poland ; L. Swiderski ; M. Moszynski ; D. Wolski
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The aim of the work is to investigate the revised concept of a neutron detector, offered by Saint Gobain-the BC-704 scintillation screen with a light readout by Wavelength Shifting (WLS) fibers. This detector was developed as a replacement of helium tubes, due to the lack of 3He on the world market. It is characterized by high sensitivity to gamma-rays, but the events from neutrons and gammas are well separated. Measurements with gamma and neutron sources have been performed and the results have been compared with helium-3 counter. According to American National Standards Institute (ANSI), we obtained n/γ discrimination on the level of 10-10, whereas absolute neutron detection efficiency was estimated as approximately two times higher than in the case of the reference 3He tube without the moderator. The tested detector is a sample prototype of one detector configuration of many possible, and that it can be modified to the neutron efficiency specification required.

Published in:

Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2011 IEEE

Date of Conference:

23-29 Oct. 2011