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Converter thickness optimisation using Monte Carlo simulations of Fluorescent Nuclear Track Detectors for neutron dosimetry

Secondary neutrons generated during ion beam radiotherapy present a concern due to the potential dose deposition beyond the treatment volume, thereby elevating the risk of inducing secondary tumours. These neutrons can possess energies comparable to those of the primary ions, reaching magnitudes of...

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Main Authors: Schmidt, Stefan (Author) , Stabilini, Alberto (Author) , Thai, Long-Yang Jan (Author) , Yukihara, Eduardo G. (Author) , Jäkel, Oliver (Author) , Vedelago, José (Author)
Format: Article (Journal)
Language:English
Published: 16 March 2024
In: Radiation measurements
Year: 2024, Volume: 173, Pages: 107097-1-107097-8
ISSN:1879-0925
DOI:10.1016/j.radmeas.2024.107097
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.radmeas.2024.107097
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S1350448724000453
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Author Notes:Stefan Schmidt, Alberto Stabilini, Long-Yang J. Thai, Eduardo G. Yukihara, Oliver Jäkel, José Vedelago

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520 |a Secondary neutrons generated during ion beam radiotherapy present a concern due to the potential dose deposition beyond the treatment volume, thereby elevating the risk of inducing secondary tumours. These neutrons can possess energies comparable to those of the primary ions, reaching magnitudes of several hundred MeV, posing a challenge for neutron detectors. Fluorescent Nuclear Track Detectors (FNTDs) are promising detectors for high-energy neutron dosimetry given their capability to detect particles with a low linear energy transfer. In this work, the sensitivity of FNTDs to neutron energies reaching 20MeV was analysed by experiments and Monte Carlo (MC) simulations, quantifying the recoil proton yield of FNTDs combined with polyethylene (PE) converters of different thicknesses. The FNTDs were read out using a dedicated FNTD reader, demonstrating a reasonable uncertainty by analysing a detector area of 0.1mm2. Investigations of different converter thicknesses reveal optimal detector sensitivity between 0.5mm to 1.0mm for a 241AmBe source, yielding a maximum sensitivity of (22.7±3.4) tracksmSv-1mm-2. Similar converter-FNTD configurations were assessed through MC simulations using FLUKA, yielding a correlation between detector sensitivity and converter thickness. Furthermore, an enhanced detector sensitivity for neutron energies up to 20MeV was found for the PE converter thickness of 4.0mm. The MC simulations can be used to optimise FNTD detector configurations for measuring higher neutron energies by maximising the recoil proton yield. 
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