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Design of a new IRSN thermal neutron fileds facility using Monte-carlo simulations


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Titre du congrès :NEUDOS 10 
Ville du congrès :Uppsala
Date du congrès :12/06/2006
Titre de la revue : Radiation Protection Dosimetry 126 issue 1-4 Pages 58-63

Type de document > *Congrès/colloque

Mots clés >

Unité de recherche > IRSN/DRPH/SDE/LMDN

Auteurs > LACOSTE Véronique

Date de publication > 01/08/2007

Résumé

The Institute for Radiological Protection and Nuclear Safety owns a graphite-moderated AmBe neutron field facility, SIGMA, that has to be reconstructed. Monte-Carlo simulations were performed to study the design of a new thermal facility based on IRSN existing facilities. Studies related to an update version of SIGMA concerned the enhancement of the thermal neutrons contribution to the dose equivalent. Calculations were mainly performed for a 252Cf neutron source distribution located at the centre of a graphite moderator block. A quasi-pure thermal neutron field was obtained with a 2.4 x 2.4 x 2.4-m3 block of graphite. A second acceptable neutron field was obtained with 3.3-MeV mono-energetic neutrons created by a 400-kV accelerator coupled to a graphite assembly of 1.5 x 1.5 x 1.5 m3. The characteristics of the studied thermal fields with the requirement for a reference calibration field are compared, and the advantages and drawbacks of the different producing methods are discussed.