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Radiation Protection Dosimetry Advance Access originally published online on May 18, 2007
Radiation Protection Dosimetry 2007 126(1-4):337-341; doi:10.1093/rpd/ncm070
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Set-up of a passive Bonner sphere system for neutron spectrometry at mixed fields with predominant photon component based on activation detector

K. Amgarou1,*, V. Lacoste1, H. Muller1 and F. Fernández2

1 Institut de Radioprotection et de Sûreté Nucléaire, BP 3, 13115 Saint-Paul-lez-Durance Cedex, France
2 Grup de Física de les Radiacions, Departament de Física, Universitat Autónoma de Barcelona, E-08193 Bellaterra. Spain

* Corresponding author: khalil.amgarou{at}irsn.fr

A passive Bonner sphere system (BSS), based on thermal neutron activation detectors, was developed to perform neutron spectrometry in pulsed and very intense (n-{gamma}) fields with predominant photon component, as those produced by high energy (>10 MV) medical linear electron accelerators. In this paper, a description of the new system is presented together with an experimental characterisation of a portable Sodium Iodide (NaI) detector and a fixed high-purity Germanium one, both used to measure the induced {gamma}-activity of the activated materials, respectively, in situ and in the laboratory. The choice of the activated materials is justified according to pre-established practical considerations and physical criteria. The response functions of the entire passive BSS were calculated using the MCNPX code. A preliminary experimental validation with a bare 252Cf source is given as well.


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