Effectiveness of radiation shielding design for ProBeam proton therapy system(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2022年第11期
- Page:
- 1349-1354
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Effectiveness of radiation shielding design for ProBeam proton therapy system
- Author(s):
- GAO Nan1; WANG Yuxiang2; LIU Zhipeng2; WANG Yuanyuan2
- 1. Department of Medical Engineering, Ion Medical Center of the First Affiliated Hospital of University of Science and Technology of China (Hefei Ion Medical Center), Hefei 230088, China 2. Department of Clinical Physics and Technique, Ion Medical Center of the First Affiliated Hospital of University of Science and Technology of China (Hefei Ion Medical Center), Hefei 230088, China
- Keywords:
- Keywords: radiation shielding proton therapy system radiation field environment impact
- PACS:
- R144.1；R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2022.11.006
- Abstract:
- Abstract: Objective To measure and analyze the effectiveness of radiation shielding design for medical proton therapy system for providing a reference for relevant institutes and departments to carry out radiation protection measurements in proton radiation workplace and related researches. Methods Taking Varian ProBeam proton therapy system as the research object, a number of concerned measurement positions were selected according to the layouts of the cyclotron, treatment rooms and proton beam transmission path. Furthermore, the worst-case scenarios were chosen at each concerned position during the measurements. X/γ detectors and neutron detectors were used to measure the ambient radiation levels (X/γ dose rate and neutron dose rate) at each concerned position in different case scenarios of the proton system, and a theoretical analysis was carried out on the measurement results. Results The dose rates of X/γ and neutron at each concerned position were all below the limit of radiation protection standard, and most of the measurements were close to the background level. Particularly, the maximal dose rate which measured at the U1 position in the power room upon the energy degrader was 2.28 μSv/h, lower than the dose rate limit (10 μSv/h) applicable to this point that was required by the radiation protection standard. Conclusion The radiation shielding design for proton therapy system meets the requirements of radiation protection standard. All the measured dose rates at concerned positions in worst-case scenarios are within the tolerance of radiation protection standard. The idea of concerned position selection, setting up the worst-case scenarios and onsite radiation measurement in this research provides a reference for similar researches.
Last Update: 2022-11-25