Fast neutron spectrometry using thick threshold detectors

¹ Laboratoire SNIRM-Faculté de Physique Université des Sciences et de la Technologie Houari Boumédiène BP 32 El-Alia BabEzzouar, Algiers-Algeria
² Centre de Recherche Nucléaire d’Alger 02 Boulevard Frantz-Fanon, BP.399, Algiers-Algeria

^* E-mail: gmedkour@yahoo.com

Abstract

This paper discusses the use of thick threshold activation detectors for the characterization of low intensity neutron fields. This technique has been applied to the determination of the spectral emission of a low activity (37 GBq) Am-Be source. The reaction rates induced by the neutrons emitted by this source in different thick metallic targets (Al, Si, Fe, In) have been measured in the following reactions: ²⁷Al(n,p)²⁷Mg, ²⁷Al(n,α)²⁴Na, ²⁸Si(n,p)²⁸Al, ⁵⁶Fe(n,p)⁵⁶Mn, ¹¹⁵In(n, n′)^115mIn and ¹¹⁵In(n, γ)^116mIn. Each measured reaction rate corresponding to a threshold detector response depends on the spectral emission of the source via a correcting factor. This factor, which takes into account the source detector geometry, the neutron attenuation and diffusion by the detectors, has been determined by Monte Carlo simulation using MCNP5 code. The spectral emission of the neutron source has been generated from the response matrix of the threshold detectors by using different neutron spectrum unfolding methods (Stayn'l, Gravel and Maxed). A fairly good agreement with the assumed ISO spectrum has been achieved.