| Li Dawei,Ji Yunlong,Yuan Yong,et al.Experimental study on measurement of short pulsed and high-dose-rate X-ray by therapeutic grade ionization chamber[J].Chinese Journal of Radiological Medicine and Protection,2021,41(8):626-630 |
| Experimental study on measurement of short pulsed and high-dose-rate X-ray by therapeutic grade ionization chamber |
| Received:September 27, 2020 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.08.011 |
| KeyWords:Short pulsed X-ray High dose rate Air Kerma Therapeutic grade ionization chamber dosimeter Thermoluminescence dosimeter |
| FundProject:军队后勤科研重大项目（AWS16J014） |
| Author Name | Affiliation | E-mail | | Li Dawei | Institute of Radiation Medicine, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100850, China | | | Ji Yunlong | Institute of Radiation Medicine, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100850, China | | | Yuan Yong | Institute of Radiation Medicine, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100850, China | | | Zhou Hongmei | Institute of Radiation Medicine, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100850, China | | | Dong Guofu | Institute of Radiation Medicine, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100850, China | | | Wang Qi | Institute of Radiation Medicine, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100850, China | | | Ning Jing | Institute of Radiation Medicine, Academy of Military Medical Sciences, Academy of Military Sciences, Beijing 100850, China | nj75@sohu.com |
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| Abstract:: |
| Objective To investigate the application of therapeutic grade ionization chamber to rapid measurement of short pulsed and high-dose-rate X-ray.Methods The half-value layer of pulsed X-ray caused by an electron accelerator was measured by interpolation method and its equivalent energy was estimated. The cumulative doses from a certain amount of pulsed radiation at different distances in the same direction around the equipment were compared using the therapeutic grade ionization chamber and thermoluminescence measurement method. The relationship between the measurement result by using ionization chamber dosimeter and the distances away from source was analyzed. The cumulative doses from a certain amount of pulsed radiation at the same location at different frequencies were compared.Results In working condition, 100 pulses of radiation were received accumulatively at 1 to 12 meters away from the outer wall of the equipment. The range of air Kerma was 0.08-9.65 mGy measured by using thermoluminescence dometers and 0.08-9.85 mGy using the ionization chamber dosimeters, respectively. The difference between both is within 10%. At different frequencies (1-10 Hz), there was no significant difference in X-ray air Kerma from 100 pulses measured by ionization chamber dosimeter at 2 m away from the front of the equipment (P>0.05).Conclusions The therapeutic grade ionization chamber dosimeter can be used for the rapid measurement of short pulsed X-ray radiation dose in the range of dose rates and pulse frequencies involved in the experimental accelerator device. |
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