| Zhou Wanyi,Gong Hui,Qiu Rui,Hu Ankang,Li Junli,Zhang Hui,Yu Lang,Wang Weiping.Feasibility of diamond detector on Flash radiation dosimetry online[J].Chinese Journal of Radiological Medicine and Protection,2023,43(9):729-735 |
| Feasibility of diamond detector on Flash radiation dosimetry online |
| Received:February 16, 2023 |
| DOI：10.3760/cma.j.cn112271-20230216-00036 |
| KeyWords:Diamond detector Flash radiation Dose measurement |
| FundProject:国家重点研发计划项目（2021YFF0603600）；国家自然科学基金（12175114） |
| Author Name | Affiliation | E-mail | | Zhou Wanyi | Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China | | | Gong Hui | Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China | | | Qiu Rui | Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China | qiurui@tsinghua.edu.cn | | Hu Ankang | Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China | | | Li Junli | Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China | | | Zhang Hui | Key Laboratory of Particle & Radiation Imaging, Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China | | | Yu Lang | Department of Peking Union Medical College Hospital, Beijing 100730, China | | | Wang Weiping | Department of Peking Union Medical College Hospital, Beijing 100730, China | |
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| Abstract:: |
| Objective To explore the feasibility of synthetic diamond detector in use for Flash radiation dosimetry by designing a diamond dosimeter and conducting a series of dosimetric characteristic tests.Methods A diamond detector system prototype with real-time current output was developed using a CIVIDECTM B1HV diamond sensor and designing a large dynamic range current measurement circuit based on the pre-integration method. The dose (dose-rate) response linearity was tested under irradiation from both electron beam and X ray ultra-high dose rate. Dose (dose-rate) calibration was performed against a medical accelerator to gain the charge-dose transfer coefficient.Results Good linear correlation (R2=0.99) between detector output charge and reference dose per pulse was shown under electron beam irradiation of 0.08-0.50 Gy/pulse. Good linearity (R2=0.99) is also shown under irradiation from electron beam with ultra-high dose rate (400 Gy/s) and conventional dose rate (0.5 Gy/s). Strictly linear correlation (R2=1) was shown between detector output integrated charge and reference dose under X ray irradiation at ultra-high average dose rate (75.5 Gy/s) and conventional average dose rate (0.5 Gy/s). The charge-dose and current-dose rate conversion factors for practical use were 0.751 7 μC/Gy and 0.753 5 μA·Gy·s-1, respectively.Conclusions Considerable linearity of the diamond detector dose responses were shown under irradiation both from electron beam and X-ray beam, which could provide a relatively rapid and accurate dosimetry for Flash preclinical experiments. Furthermore, diamond detectors have great potential in the quality assurance for Flash radiotherapy. |
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