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- W3100217209 abstract "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." @default.
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- W3100217209 date "2015-10-14" @default.
- W3100217209 modified "2023-10-17" @default.
- W3100217209 title "Investigation of background in large-area neutron detectors due to alpha emission from impurities in aluminium" @default.
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- W3100217209 doi "https://doi.org/10.1088/1748-0221/10/10/p10019" @default.
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