Detector for imaging and dosimetry of laser-driven epithermal neutrons by alpha conversion

S.R. Mirfayzi, A. Alejo, H. Ahmed, L.A. Wilson, S Ansell, C. Armstrong, N.M.H. Butler, R.J. Clarke, A. Higginson, M. Notley, D. Raspino, D. R. Rusby, M. Borghesi, N.J. Rhodes, P. McKenna, D. Neely, C.M. Brenner, S. Kar

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An epithermal neutron imager based on detecting alpha particles created via boron neutron capture mechanism is discussed. The diagnostic mainly consists of a mm thick Boron Nitride (BN) sheet (as an alpha converter) in contact with a non-borated cellulose nitride film (LR115 type-II) detector. While the BN absorbs the neutrons in the thermal and epithermal ranges, the fast neutrons register insignificantly on the detector due to their low neutron capture and recoil cross-sections. The use of solid-state nuclear track detectors (SSNTD), unlike image plates, micro-channel plates and scintillators, provide safeguard from the x-rays, gamma-rays and electrons. The diagnostic was tested on a proof-of-principle basis, in front of a laser driven source of moderated neutrons, which suggests the potential of using this diagnostic (BN+SSNTD) for dosimetry and imaging applications.
Original languageUndefined/Unknown
Pages (from-to)C10008
JournalJournal of Instrumentation
Issue number10
Publication statusPublished - 17 Oct 2016

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