STP1228

    Neutron Fluence Determination at Reactor Filters by 3He Proportional Counters: Comparison of Unfolding Algorithms

    Published: Jan 1994


      Format Pages Price  
    PDF (152K) 10 $25   ADD TO CART
    Complete Source PDF (15M) 10 $131   ADD TO CART


    Abstract

    Multichannel pulse height measurements with a cylindrical 3He proportional counter obtained at a reactor filter of natural iron are taken to investigate the properties of three algorithms for neutron spectrum unfolding. For a systematic application of uncertainty propagation the covariance matrix of previously determined 3He response functions is evaluated. The calculated filter transmission function together with a covariance matrix estimated from cross-section uncertainties of the filter material is used as fluence pre-information. The results obtained from algorithms with and without pre-information differ in shape and uncertainties for single group fluence values, but there is sufficient agreement when evaluating integrals over neutron energy intervals.

    Keywords:

    unfolding, spectrometry, 3, He proportional counter, algorithms for unfolding, covariance matrix


    Author Information:

    Matzke, M
    Senior scientists, Physikalisch-Technische Bundesanstalt (PTB), Braunschweig,

    Alberts, WG
    Senior scientists, Physikalisch-Technische Bundesanstalt (PTB), Braunschweig,

    Dietz, E
    Senior scientists, Physikalisch-Technische Bundesanstalt (PTB), Braunschweig,


    Paper ID: STP15124S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP15124S


    CrossRef ASTM International is a member of CrossRef.