Experimental study on measurement of short pulsed and high-dose-rate X-ray by therapeutic grade ionization chamber
10.3760/cma.j.issn.0254-5098.2021.08.011
- VernacularTitle:用治疗级电离室测量短脉冲高剂量率X射线的实验研究
- Author:
Dawei LI
1
;
Yunlong JI
;
Yong YUAN
;
Hongmei ZHOU
;
Guofu DONG
;
Qi WANG
;
Jing NING
Author Information
1. 军事科学院军事医学研究院辐射医学研究所，北京 100850
- Keywords:
Short pulsed X-ray;
High dose rate;
Air Kerma;
Therapeutic grade ionization chamber dosimeter;
Thermoluminescence dosimeter
- From:
Chinese Journal of Radiological Medicine and Protection
2021;41(8):626-630
- CountryChina
- Language:Chinese
-
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.
