Liu Zhulei, You Dan, Zhou Dan, Bu Ruirui, Li Yao, Wang Xiaowa
Department of Medical Physics, Shanghai Proton and Heavy Ion Center, 4365 Kangxin Road Pudong, Shanghai 201321, China.
Shanghai Key Laboratory of Radiation Oncology, 4365 Kangxin Road Pudong, Shanghai 201321, China.
J Radiat Res. 2025 Jul 22;66(4):365-371. doi: 10.1093/jrr/rraf023.
This study addresses the escalating radiation safety concerns among medical professionals due to the rising application of proton and carbon ion radiotherapy. It evaluates the occupational radiation exposure faced by therapists when utilizing the Siemens IONTRIS Proton-Carbon Ion System. Through random sampling of 80 patients treated between January and June 2024, we recorded particle types and counts and measured dose rates using a photon/neutron radiation dose meter. Notably, 1 min post-treatment, the dose rate peaked at 16.00 μSv/h near the tumor's skin surface, showing a significant correlation with particle count. The therapist's standing position and the surfaces of the range shifter and ripple filter registered average dose rates of 1.25 μSv/h and 3.63 μSv/h, 0.33 μSv/h, respectively. Other points averaged 0.08 μSv/h, with no neutron detection. The study concludes that the annual average occupational exposure for therapists, at ~300 μSv, is significantly below the International Commission on Radiological Protection's recommended dose equivalent limit, confirming the safety of the Siemens IONTRIS device in clinical settings.
本研究探讨了由于质子和碳离子放射治疗应用的增加，医学专业人员对辐射安全日益增长的担忧。它评估了治疗师在使用西门子IONTRIS质子 - 碳离子系统时所面临的职业辐射暴露。通过对2024年1月至6月期间接受治疗的80名患者进行随机抽样，我们记录了粒子类型和数量，并使用光子/中子辐射剂量计测量了剂量率。值得注意的是，治疗后1分钟，肿瘤皮肤表面附近的剂量率峰值为16.00μSv/h，与粒子数量显示出显著相关性。治疗师的站立位置以及射程移位器和波纹过滤器表面的平均剂量率分别为1.25μSv/h、3.63μSv/h和0.33μSv/h。其他点的平均剂量率为0.08μSv/h，未检测到中子。该研究得出结论，治疗师的年平均职业暴露量约为300μSv，显著低于国际放射防护委员会推荐的剂量当量限值，证实了西门子IONTRIS设备在临床环境中的安全性。
