Akademik Veri Yönetim Sistemi
RAP 26 International Conference on Radiation Applications,, Lisbon, Portekiz, 25 - 29 Mayıs 2026, ss.1-2, (Tam Metin Bildiri)
In high-energy proton accelerators, secondary
radiation fields generated by proton interactions with target materials
constitute a critical engineering challenge in shielding design, primarily due
to the high penetration capability of neutrons. In this study, the secondary
particle field produced by the interaction of 1000 MeV protons with a copper
target was investigated using the FLUKA Monte Carlo particle transport code for
three different multilayer shielding configurations: layered concrete shielding
(Design 1), layered ferroboron (FeB) shielding (Design 2), and an asymmetric
concrete–FeB hybrid shielding (Design 3).
The analyses were performed based on secondary
particle production and two-dimensional dose distributions expressed in terms
of ambient dose equivalent H*(10). The results indicate that neutrons are the
dominant secondary component in all configurations and play a dominant role in
determining the spatial characteristics of the radiation field. In FeB-based
shielding systems, the presence of high atomic number constituents leads to an
increase in hadronic and electromagnetic interactions, resulting in enhanced
neutron and photon production. In contrast, concrete-based shielding systems
exhibit more effective neutron moderation due to their hydrogen content, with a
relatively more pronounced contribution from charged particles.
The asymmetric hybrid shielding configuration
effectively combines the advantages of both materials by optimizing neutron
moderation and absorption processes, thereby providing a more balanced particle
distribution and a more controlled dose field. These findings demonstrate that,
in multilayer shielding design, not only the total thickness but also the
material selection, layer sequencing, and geometric configuration play a
decisive role in determining shielding performance.