| 李大伟,纪云龙,袁勇,等.用治疗级电离室测量短脉冲高剂量率X射线的实验研究[J].中华放射医学与防护杂志,2021,41(8):626-630.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].Chin J Radiol Med Prot,2021,41(8):626-630 |
| 用治疗级电离室测量短脉冲高剂量率X射线的实验研究 |
| Experimental study on measurement of short pulsed and high-dose-rate X-ray by therapeutic grade ionization chamber |
| 投稿时间：2020-09-27 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.08.011 |
| 中文关键词: 短脉冲X射线 高剂量率 空气比释动能 治疗级电离室剂量仪 热释光剂量计 |
| 英文关键词:Short pulsed X-ray High dose rate Air Kerma Therapeutic grade ionization chamber dosimeter Thermoluminescence dosimeter |
| 基金项目:军队后勤科研重大项目（AWS16J014） |
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| 中文摘要: |
| 目的 探索研究治疗级电离室用于短脉冲高剂量率X射线的快速测量。方法 利用内插法测量某电子加速器装置所致脉冲X射线半值层，估算其等效能量；采用治疗级电离室和热释光测量方法，对比设备周围同一方向不同距离处相同数量脉冲辐射的累积剂量；分析电离室剂量仪测量结果与源距离之间的关系，对比不同频率下同一位置相同数量脉冲辐射的累积剂量。结果 工作状态下，距设备外壁1~12 m累计接收100个脉冲辐射，热释光测得空气比释动能范围0.08~9.65 mGy，电离室剂量仪所测范围0.08~9.85 mGy，两者相差在10%以内；距设备正前方2 m处，不同频率（1~10 Hz）下，电离室剂量仪所测100个脉冲所致X射线空气比释动能无明显差异（P>0.05）。结论 在实验所涉加速器装置的剂量率和脉冲频率范围内，治疗级电离室剂量仪可用于短脉冲X射线辐射剂量的快速测量。 |
| 英文摘要: |
| 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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