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Photon dose rate distribution inside and outside a brachytherapy room

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Abstract

In a brachytherapy room irradiated with an Iridium-192 (192Ir) source, the spatial distributions of photon dose rates were measured and calculated for the dose distribution both inside and outside the room. The spatial distributions were measured using a thermoluminescent dosimeter (LiF-100) on the surfaces of the concrete walls and barriers of the irradiation room. The calculations were performed using the particle and heavy ion transport code system (PHITS) by considering the detailed model of the brachytherapy room and the radiation source used in the measurements. The measured and calculated doses exhibited a similar distribution pattern within and outside the brachytherapy room. To reduce the edge effect at the entrance door, the addition of a 3-mm thick lead layer on the surface of the concrete wall on the left doorstop is recommended. For the 60Co source, with the existing walls and lead door thickness, the dose at the control console and in front of the entrance maze increased by a factor of approximately 60.

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Source geometry is centered at x = 500 cm and z = 200 cm. b Sliding lead door (denoted as 103) outside of the room. The lead thickness is 6 mm

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Acknowledgements

This work was supported by a Universiti Sultan Zainal Abidin Research Grant (Dana Penyelidikan Universiti) [UniSZA/2020/DPU2.0/07]. The authors would also like to extend their gratitude to the PHITS development team of the Japanese Atomic Energy Agency (JAEA) and the High Energy Accelerator Research Organization (Kō Enerugī Kasokuki Kenkyū Kikō, KEK) for providing us with wonderful Monte Carlo simulation PHITS code. Appreciation also goes to the staff of the radiotherapy unit in the Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia (USM) for their in-depth guidance on measurements.

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Authors and Affiliations

  1. Faculty of Health Sciences, Universiti Sultan Zainal Abidin, 21300, Kuala Nerus, Terengganu, Malaysia

    Adila Hanim Aminordin Sabri & Suffian Mohamad Tajudin

  2. Oncological and Radiological Science Cluster, Advance Medical and Dental Institute, Universiti Sains Malaysia, 13200, Kepala Batas, Pulau Pinang, Malaysia

    Mohd Zahri Abdul Aziz

  3. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-Mura, Ibaraki, 319-1195, Japan

    Takuya Furuta

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  1. Adila Hanim Aminordin Sabri
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  2. Suffian Mohamad Tajudin
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  3. Mohd Zahri Abdul Aziz
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Correspondence to Suffian Mohamad Tajudin.

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Aminordin Sabri, A.H., Mohamad Tajudin, S., Abdul Aziz, M.Z. et al. Photon dose rate distribution inside and outside a brachytherapy room. Radiol Phys Technol 16, 109–117 (2023). https://doi.org/10.1007/s12194-023-00703-8

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  • DOI: https://doi.org/10.1007/s12194-023-00703-8

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