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Radiation Protection Dosimetry 2004 110(1-4):529-532; doi:10.1093/rpd/nch279
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

Characterization of Bonner sphere systems at monoenergetic and thermal neutron fields

V. Lacoste1,*, V. Gressier1, J.-L. Pochat1, F. Fernández2, M. Bakali2 and T. Bouassoule2

1 Institut de Radioprotection et de Sûreté Nucléaire. BP 3, 13115 Saint Paul-Lez-Durance Cedex, France
2 GFR, Universitat Autónoma de Barcelona, E-08193 Bellaterra, Spain

* Corresponding author: Veronique.Lacoste{at}irsn.fr

The Institute for Radiological Protection and Nuclear Safety (IRSN) and the GFR, Universitat Autónoma de Barcelona (UAB) use Bonner spheres (BS) for neutron spectrometry at workplaces. The two systems, equipped with similar cylindrical 3He proportional counters, were simulated with the MCNP Monte-Carlo code to determine the response to neutrons of different energies for each polyethylene sphere. The BS systems were characterized at monoenergetic and thermal neutron fields. Measurements were performed at the Physikalisch-Technische Bundesanstalt (PTB) and at the National Physical Laboratory (NPL) standard laboratories, and with the newly characterized IRSN ‘SIGMA’ thermal neutron facility. The energy distribution of the reference neutron fluence was folded with the response functions for comparison purposes with the experimental data. In almost all cases related to monoenergetic neutrons, a good agreement between the experimental and the calculated count rates was found, and some discrepancies of a few per cent were observed in the thermal region.


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