Study on the absorbed dose in 1 cm water by I-125 particle sources and the performance of water-equivalent materials

Zhongbin Hang; Qiao Li; Minghan Jia; Yuntao Liu; Mingzhe Song; Kexin Wei; Hongyu Wang; Ning Ni; Zhongbin Teng

doi:10.1117/12.3025624

8 April 2024 Study on the absorbed dose in 1 cm water by I-125 particle sources and the performance of water-equivalent materials

Zhongbin Hang, Qiao Li, Minghan Jia, Yuntao Liu, Mingzhe Song, Kexin Wei, Hongyu Wang, Ning Ni, Zhongbin Teng

Author Affiliations +

Proceedings Volume 13090, International Conference on Computer Application and Information Security (ICCAIS 2023); 130900S (2024) https://doi.org/10.1117/12.3025624
Event: International Conference on Computer Application and Information Security (ICCAIS 2023), 2023, Wuhan, China

Abstract

This study aims to establish a large-volume extrapolation ionization chamber with water-equivalent materials for the absolute measurement of the absorbed dose in 1 cm depth water by I-125 particle source based on ionization methods. RW-1, RW-3, PMMA, and Blue Water, were selected for investigation, taking into account internationally adopted water-equivalent materials and commonly used alternatives. MCNP5 and EGSnrc software were used to developed models for the 6711 particle source and extrapolation ionization chamber. Varying water-equivalent materials, comparative analysis with WATER was conducted in terms of mass attenuation coefficient (μ/ρ), mass energy absorption coefficient (μ_en/ρ), mass energy transfer coefficient (μ_tr/ρ), energy response, and pulse height spectrum. Results indicate that within the 20~50 keV energy range, RW-3 and PMMA exhibit significant deviations from WATER in various parameters, indicating poor water equivalence. Conversely, Blue Water and RW-1 demonstrate good agreement with WATER across all parameters, suggesting better water equivalence. In cases where RW-1 is unavailable, Blue Water can be considered as a suitable alternative. This research provides a foundation for the design and establishment of a device for the absolute measurement of absorbed dose in 1 cm depth water by I-125 particle source.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Zhongbin Hang, Qiao Li, Minghan Jia, Yuntao Liu, Mingzhe Song, Kexin Wei, Hongyu Wang, Ning Ni, and Zhongbin Teng "Study on the absorbed dose in 1 cm water by I-125 particle sources and the performance of water-equivalent materials", Proc. SPIE 13090, International Conference on Computer Application and Information Security (ICCAIS 2023), 130900S (8 April 2024); https://doi.org/10.1117/12.3025624

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KEYWORDS

Polymethylmethacrylate

Monte Carlo methods

Particles

Mass attenuation coefficient

Ionization

Absorption

Vacuum chambers

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