Feasibility of diamond detector on Flash radiation dosimetry online
10.3760/cma.j.cn112271-20230216-00036
- VernacularTitle:金刚石探测器在Flash照射实时剂量测量中的应用
- Author:
Wanyi ZHOU
1
;
Hui GONG
;
Rui QIU
;
Ankang HU
;
Junli LI
;
Hui ZHANG
;
Lang YU
;
Weiping WANG
Author Information
1. 清华大学工程物理系 粒子技术与辐射成像教育部重点实验室，北京 100084
- Keywords:
Diamond detector;
Flash radiation;
Dose measurement
- From:
Chinese Journal of Radiological Medicine and Protection
2023;43(9):729-735
- CountryChina
- Language:Chinese
-
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 CIVIDEC? 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.
