Joint estimation of the fast and thermal components of a high neutron flux with a two on-line detector system

Philippe Filliatre, Ludovic Oriol, Christian Jammes, Ludo Vermeeren

    Research outputpeer-review


    A fission chamber with a 242Pu deposit is the best suited detector for on-line measurements of the fast component of a high neutron flux (∼ 10 14 n cm - 2 s - 1 or more) with a significant thermal component. To get the fast flux, it is, however, necessary to subtract the contribution of the thermal neutrons, which increases with fluence because of the evolution of the isotopic content of the deposit. This paper presents an algorithm that permits, thanks to measurements provided by a 242Pu fission chamber and a detector for thermal neutrons, to estimate the thermal and the fast flux at any time. An implementation allows to test it with simulated data.

    Original languageEnglish
    Pages (from-to)415-420
    Number of pages6
    JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Issue number3
    StatePublished - 21 May 2009


    This work is a part of the joined FNDS project between CEA and SCK • CEN in the framework of the Laboratoire Commun d’Instrumentation CEA– SCK • CEN (LCI).

    FundersFunder number
    FNDS - Functional Neurological Disorders Society
    California Earthquake Authority

      ASJC Scopus subject areas

      • Nuclear and High Energy Physics
      • Instrumentation

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