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Radiation Protection Dosimetry 2005 116(1-4):89-94; doi:10.1093/rpd/nci030
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Shielding calculations for a 100 MeV 30 mA proton beam

Kenneth W. Burn1,*, Lodovico Casalini1, Elisabetta Nava1, Carlo Petrovich1 and Luigi Tecchio2

1 ENEA FIS-NUC, V. M. Monte Sole 4, 40129 Bologna, Italy
2 Laboratori Nazionali di Legnaro, V.le dell'Università 2, 35020 Legnaro (Pd), Italy

* Corresponding author: kburn{at}bologna.enea.it

The Study and Production of Exotic Species (SPES) project employs a 100 MeV, 30 mA proton beam that strikes a primary target. The resulting high-energy neutron flux impinges on a secondary target of depleted uranium to produce, through fission, beams of short-lived, neutron-rich nuclei. This paper deals with some of the preliminary shielding calculations for the bunker. Monte Carlo is employed with MCNPX and, because of the deep penetrations involved, the in-house variance reduction optimiser, the direct statistical approach. The calculations exhibited a number of typical features that are addressed and discussed.


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