Aminordin Sabri Adila Hanim, Mohamad Tajudin Suffian, Abdul Aziz Mohd Zahri, Furuta Takuya
Faculty of Health Sciences, Universiti Sultan Zainal Abidin, 21300, Kuala Nerus, Terengganu, Malaysia.
Oncological and Radiological Science Cluster, Advance Medical and Dental Institute, Universiti Sains Malaysia, 13200, Kepala Batas, Pulau Pinang, Malaysia.
Radiol Phys Technol. 2023 Mar;16(1):109-117. doi: 10.1007/s12194-023-00703-8. Epub 2023 Feb 2.
In a brachytherapy room irradiated with an Iridium-192 (Ir) 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 Co 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.
在一个用铱 - 192（Ir）源进行近距离放射治疗的房间里，测量并计算了光子剂量率的空间分布，以确定房间内外的剂量分布情况。使用热释光剂量计（LiF - 100）在照射室的混凝土墙壁和屏障表面测量空间分布。通过考虑近距离放射治疗室的详细模型和测量中使用的辐射源，使用粒子和重离子传输代码系统（PHITS）进行计算。测量和计算得到的剂量在近距离放射治疗室内外呈现出相似的分布模式。为减少入口门处的边缘效应，建议在左门挡处混凝土墙表面添加一层3毫米厚的铅层。对于钴源，在现有墙壁和铅门厚度的情况下，控制台处和入口迷宫前方的剂量增加了约60倍。
