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Investigation of background in large-area neutron detectors due to alpha emission from impurities in aluminium
Thin Film Physics Division, IFM, Linköping University, Linköping, Sweden.ORCID-id: 0000-0003-3221-2086
Institute Laue Langevin, 71 avenue des Martyrs, Grenoble, France.
Institute Laue Langevin, 71 avenue des Martyrs, Grenoble, France.
Institute Laue Langevin, 71 avenue des Martyrs, Grenoble, France.
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2015 (Engelska)Ingår i: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 10, nr 10, artikel-id P10019Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Thermal neutron detector based on films of 10B4C have been developed as an alternative to 3He 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 α emitters, however, the background from α 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 α 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.

Ort, förlag, år, upplaga, sidor
2015. Vol. 10, nr 10, artikel-id P10019
Nyckelord [en]
Gaseous detectors, Instrumentation for neutron sources, Materials for gaseous detectors, Neutron detectors (cold, thermal, fast neutrons)
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
URN: urn:nbn:se:miun:diva-26714DOI: 10.1088/1748-0221/10/10/P10019ISI: 000367674700021Scopus ID: 2-s2.0-84947266821Lokalt ID: STCOAI: oai:DiVA.org:miun-26714DiVA, id: diva2:885918
Tillgänglig från: 2015-12-21 Skapad: 2015-12-21 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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Birch, JHall-Wilton, R

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