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Radiation Protection Dosimetry 2005 115(1-4):363-368; doi:10.1093/rpd/nci146
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Secondary photon fields produced in accelerator-based sources for neutron generation

S. Agosteo1,2,*, A. Cesana1,2, L. Garlati1,2, A. Pola1,2 and M. Terrani1,2

1 Dipartimento di Ingegneria Nucleare, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy
2 INFN, Sezione di Milano, via Celoria 16, 20133 Milano, Italy

* Corresponding author: stefano.agosteo{at}polimi.it

Neutrons can be produced with low-energy ion accelerators for many applications, such as the characterisation of neutron detectors, the irradiation of biological samples and the study of the radiation damage in electronic devices. Moreover, accelerator-based neutron sources are under development for boron neutron capture therapy (BNCT). Thin targets are used for generating monoenergetic neutrons, while thick targets are usually employed for producing more intense neutron fields. The associated photon field produced by the target nuclei may have a strong influence on the application under study. For instance, these photons can play a fundamental role in the design of an accelerator-based neutron source for BNCT. This work focuses on the measurement of the photon field associated with neutrons that are produced by 4.0–6.8 MeV protons striking both a thin 7LiF target (for generating monoenergetic neutrons) and a thick beryllium target. In both cases, very intense photon fields are generated with energy distribution extending up to several MeV.


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