SYMPOSIA PAPER Published: 01 January 1994

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


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.

Author Information

Matzke, M
Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
Alberts, WG
Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
Dietz, E
Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany
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Developed by Committee: E10
Pages: 310–319
DOI: 10.1520/STP15124S
ISBN-EB: 978-0-8031-5281-6
ISBN-13: 978-0-8031-1899-7