Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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Bilalodin^1,*, A. Haryadi¹, Sehah¹, Zusfahair², Y. Sardjono³, R. Tursinah<sup>4

1</sup> Department of Physics, Faculty of Mathematics and Natural Science, Jenderal Soedirman University, Purwokerto, Java, Indonesia
² Department of Chemistry, Faculty of Mathematics and Natural Science, Jenderal Soedirman University, Purwokerto, Java, Indonesia
³ Research Centre for Accelerator Technology, National Research and Innovation Agency, Jakarta, Indonesia
⁴ Center for Applied Nuclear Science and Nuclear Agency, Bandung, Indonesia

^*Corresponding author. E-mail address: bilalodin@unsoed.ac.id

Abstract: A microdosimetry test on a double layer beam shaping assembly (DLBSA) neutron beam has been carried out using the particle and heavy ion transport code system (PHITS). The test aims to understand the mechanism of interactions between neutrons and microcells and to determine the linear energy transfer (LET) and the relative biological effectiveness (RBE) values of the DLBSA neutron beam. The test was carried out by interacting a neutron beam with microcells containing ¹⁰B using a boron concentration of 70 ppm. The neutron source used comes from a 30 MeV cyclotron-based DLBSA. The simulation results show that the interaction of neutrons with microcells occurs through scattering, reflection, and absorption reaction mechanisms. The results of the microdosimetry test showed that the peak LET value of α-particles was 100 keV/μm and ⁷Li was 200 keV/μm, with an RBE value for α of 9.83 and ⁷Li of 6.11.

Keywords: microdosimetry, microcell, linear energy transfer, relative biological effectiveness, particle and heavy ion transport code system, boron neutron capture therapy.

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