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Radiation Protection Dosimetry Advance Access originally published online on September 23, 2007
Radiation Protection Dosimetry 2007 124(3):219-229; doi:10.1093/rpd/ncm419
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Characterisation of mixed neutron–photon workplace fields at nuclear facilities by spectrometry (energy and direction) within the EVIDOS project

M. Luszik-Bhadra1,*, D. Bartlett2, T. Bolognese-Milsztajn3, M. Boschung4, M. Coeck5, G. Curzio6, F. d'Errico6, A. Fiechtner4, V. Lacoste3, L. Lindborg7, M. Reginatto1, H. Schuhmacher1, R. Tanner2 and F. Vanhavere5

1 Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany
2 Radiation Protection Division, Health Protection Agency, Chilton, Didcot OX11 0RQ, UK
3 Institut de Radioprotection et de Sûreté Nucléaire, F-92265 Fontenay-aux-Roses, France
4 Paul Scherrer Institut, CH-5232 Villigen, Switzerland
5 Studiecentrum voor Kernenergie—Centre d'étude de l'énergie nucléaire, B-2400 Mol, Belgium
6 Dipartimento di Ingegneria Meccanica, Nucleare e della Produzione, I-56126 Pisa, Italy
7 Department of Medical Radiation Physics, Karolinska Institutet, SE 171 76 Stockholm, Sweden

* Corresponding author: marlies.luszik-bhadra{at}ptb.de

Within the EC project EVIDOS, 17 different mixed neutron–photon workplace fields at nuclear facilities (boiling water reactor, pressurised water reactor, research reactor, fuel processing, storage of spent fuel) were characterised using conventional Bonner sphere spectrometry and newly developed direction spectrometers. The results of the analysis, using Bayesian parameter estimation methods and different unfolding codes, some of them especially adapted to simultaneously unfold energy and direction distributions of the neutron fluence, showed that neutron spectra differed strongly at the different places, both in energy and direction distribution. The implication of the results for the determination of reference values for radiation protection quantities (ambient dose equivalent, personal dose equivalent and effective dose) and the related uncertainties are discussed.


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