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Radiation Protection Dosimetry 2004 110(1-4):545-548; doi:10.1093/rpd/nch384
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

MITOM: a new unfolding code based on a spectra model method applied to neutron spectrometry

M. Tomás1, F. Fernández1,*, M. Bakali1 and H. Muller2

1 Grup de Física de les Radiacions, Universitat Autònoma de Barcelona, Edifici Cc E-08193 Bellaterra, Spain
2 Institut de Radioprotection et de Sûreté Nucléaire, BP 3, 13115 Saint Paul-Lez-Durance Cedex, France

* Corresponding author: Francisco.Fernandez{at}uab.es

The MITOM code was developed at UAB (Universitat Autònoma de Barcelona) for unfolding neutron spectrometric measurements with a Bonner spheres system (BSS). One of the main characteristics of this code is that an initial parameterisation of the neutron energy components (thermal, intermediate and fast) is needed. This code uses the Monte Carlo method and the Bayesian theorem to obtain a set of solutions achieving different criteria and conditions between calculated and measured count rates. The final solution is an average of the acceptable solutions. The MITOM code was tested for ISO sources and a good agreement was observed between the reference values and the unfolded ones for global magnitudes. The code was applied recently to characterise both thermal SIGMA and CANEL/T400 sources of the IRSN facilities. The results of these applications were very satisfactory as well.


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