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Digital discrimination of neutrons and ?-rays in liquid scintillators using pulse gradient analysis.

Research output: Contribution to journalJournal article


Journal publication date21/07/2007
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Number of pages7
Original languageEnglish


A method for the digital discrimination of neutrons and γ-rays in mixed radiation fields is described. Pulses in the time domain, arising from the interaction of photons and neutrons in a liquid scintillator, have been produced using an accepted empirical model and from experimental measurements with an americium–beryllium source. Neutrons and γ-rays have been successfully discriminated in both of these data sets in the digital domain. The digital discrimination method described in this paper is simple and exploits samples early in the life of the pulse. It is thus compatible with current embedded system technologies, offers a degree of immunity to pulse pile-up and heralds a real-time means for neutron/γ discrimination that is fundamental to many potential industrial applications.

Bibliographic note

This paper is an example of the research supporting the development of a portable digital neutron spectrometer, which was commercialized via a spin-out company (www.hybridinstruments.com), resulted in IP protected by patent (GB2422195 September 2003). This returns royalties to the academic team and also stimulated the award of a DTi R&D award to this company for take-up of the technology. This research has itself stimulated numerous other research opportunities with the Home Office (Dr Tim Sheldon Tim.Sheldon@homeoffice.gsi.gov.uk), MoD (Prof Philip Beeley, sultan-dnd@nrta.mod.uk), BAE SYSTEMS (Dr Doug King, douglas.king@baesystems.com) and the NDA (Dr Neil Smart, neil.smart@nda.gov.uk). RAE_import_type : Journal article RAE_uoa_type : General Engineering