SEDL / STP / STP1001-EB / STP10125S

Application of Boron Covers for Neutron Spectrum Determination Purposes in Various Neutron Environments

Végh, J
Central Research Institute for Physics, Budapest,

Zijp, WL
Netherlands Energy Research Foundation ECN, ZG Petten (NH),

Nolthenius, HJ
Netherlands Energy Research Foundation ECN, ZG Petten (NH),

Alloggio, G
Ente Nazionale per l'Energia Elettrica, Centro di Ricercia Termica e Nucleare. ENEL/CRTN, Milano,

Brega, E
Ente Nazionale per l'Energia Elettrica, Centro di Ricercia Termica e Nucleare. ENEL/CRTN, Milano,

Pages: 11    Published: Jan 1989

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Abstract

Foil irradiation experiments were carried out at LFR (ECN. Petten) and WWR-SM (KFKI, Budapest). The effect of boron covers on the activation and fission detector response regions has been investigated. Fluence rate perturbation due to the applied B⁴C box in graphite or water was determined by means of transport calculations. Neutron spectrum adjustments were performed by the SAND-II and STAY'SL codes. The B⁴C cover shifts the response regions of the resonance reactions from the thermal region to the 0.1 keV to 1.0 MeV interval. Where boron-covered reactions are used in a least squares spectrum adjustment procedure, the uncertainty of the spectrum is reduced significantly in the intermediate energy region.