  This paper summarizes the results obtained from an international comparison
exercise on neutron spectra unfolding in Bonner spheres spectrometry, organized
within the activities of EURADOS working group 6: computational dosimetry. Four
realistic situations were considered: a medical accelerator, a workplace field,
an irradiation room and a skyshine scenario. The reference solutions are
presented, given in terms of idealized fluence-energy distributions and dose
rates, along with details of their derivation using verified Monte Carlo codes.
The wide variety of unfolded results that were submitted by the participants
are then provided, with some shown to agree well with the reference solutions
but others showing significant energy-dependent discrepancies. Finally,
explanations for some of these discrepancies are proposed, along with suggested
methods for how they might be improved.
