Investigation of background in large-area neutron detectors due to alpha emission from impurities in aluminium
العنوان: | Investigation of background in large-area neutron detectors due to alpha emission from impurities in aluminium |
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المؤلفون: | J.-F. Clergeau, Richard Hall-Wilton, J. C. Buffet, Jens Jensen, Bruno Guerard, M. Ferraton, P. Van Esch, Lars Hultman, Jens Birch, Carina Höglund, Anton Khaplanov, F. Piscitelli |
بيانات النشر: | arXiv, 2015. |
سنة النشر: | 2015 |
مصطلحات موضوعية: | Physics - Instrumentation and Detectors, Materials science, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Nuclear engineering, Detector, chemistry.chemical_element, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Particle detector, Neutron temperature, 010305 fluids & plasmas, Surface coating, chemistry, Aluminium, 0103 physical sciences, Measuring instrument, Neutron detection, Neutron, Instrumentation, Mathematical Physics |
الوصف: | Thermal neutron detector based on films of $^{10}$B$_4$C have been developed as an alternative to $^3$He detectors. In particular, The Multi-Grid detector concept is considered for future large area detectors for ESS and ILL instruments. An excellent signal-to-background ratio is essential to attain expected scientific results. Aluminium is the most natural material for the mechanical structure of of the Multi-Grid detector and other similar concepts due to its mechanical and neutronic properties. Due to natural concentration of $\alpha$ emitters, however, the background from $\alpha$ particles misidentified as neutrons can be unacceptably high. We present our experience operating a detector prototype affected by this issue. Monte Carlo simulations have been used to confirm the background as $\alpha$ particles. The issues have been addressed in the more recent implementations of the Multi-Grid detector by the use of purified aluminium as well as Ni-plating of standard aluminium. The result is the reduction in background by two orders of magnitude. A new large-area prototype has been built incorporating these modifications. Comment: 14 pages, 8 figures. Submission to Journal of Instrumentation new version uploaded addressing referee comments (minor revision). Added discussion of radon contamination and more details on simulated spectra |
DOI: | 10.48550/arxiv.1507.00607 |
URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b2a849b1a46aa2e0c6f9ed0378be9d4f |
حقوق: | OPEN |
رقم الأكسشن: | edsair.doi.dedup.....b2a849b1a46aa2e0c6f9ed0378be9d4f |
قاعدة البيانات: | OpenAIRE |
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