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Intercomparison of radiation protection devices in a high-energy stray neutron field, Part II: Bonner sphere spectrometry.
Radiat. Meas. 44, 660-672 (2009)
The European Commission has funded within its 6th Framework Programme a three-year project (2005-2007) called CONRAD, COordinated Network for RAdiation Dosimetry. A major task of the CONRAD Work Package 'complex mixed radiation fields at workplaces' was to organise a benchmark exercise in a workplace field at a high-energy particle accelerator where neutrons are the dominant radiation component. The CONRAD benchmark exercise took place at the Gesellschaft fur Schwerionenforschung mbH (GSI) in Darmstadt, Germany in July 2006. In this paper, the results of the spectrometry using four extended -range Bonner sphere spectrometers of four different institutes are reported. Outside Cave A the neutron spectra were measured with three spectrometers at six selected positions and ambient dose equivalent values were derived for use in the intercomparison with other area monitors and dose, meters. At a common position all three spectrometers were used to allow a direct comparison of their, results which acts as an internal quality assurance. The comparison of the neutron spectra measured by the different groups shows very good agreement. A detailed analysis presents some differences between the shapes of the spectra and possible sources of these differences are discussed. However, the ability of Bonner sphere spectrometers to provide reliable integral quantities like fluence and ambient dose equivalent is well demonstrated in this exercise. The fluence and dose results derived by the three groups agree very well within the given uncertainties, not only with respect to the total energy region present in this environment but also for selected energy regions which contribute in certain strength to the total values. In addition to the positions outside Cave A one spectrometer was used to measure the neutron spectrum at one position in the entry maze of Cave A. In this case a comparison was possible to, earlier measurements.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
High energy neutrons; Radiation protection; Stray field; Bonner spheres; Mixed radiation fields; Neutron spectrometry; Area monitoring; Radiation shielding
ISSN (print) / ISBN
1350-4487
e-ISSN
1879-0925
Journal
Radiation Measurements
Quellenangaben
Volume: 44,
Issue: 7-8,
Pages: 660-672
Publisher
Elsevier
Publishing Place
Oxford
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Radiation Protection (ISS)