| 252Cf中子后装治疗机步进精度测量及其剂量偏差研究 |
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| 引用本文： | 李明生,姜庆寰,刘雅,程金生.252Cf中子后装治疗机步进精度测量及其剂量偏差研究[J].中华放射医学与防护杂志,2017,37(8):626-629. |
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| 作者姓名： | 李明生 姜庆寰 刘雅 程金生 |
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| 作者单位： | 100088 北京, 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室,100088 北京, 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室,100088 北京, 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室,100088 北京, 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室 |
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| 摘 要： | 目的 研究252Cf中子后装治疗机步进精度以及步进偏差引起的剂量偏差。方法 利用EBT3胶片测量252Cf中子源的步进，然后通过Image J软件测量光密度值找到每步252Cf中子源的中心，计算出每步之间的间隔；利用双电离室法测量252Cf中子源位置偏差引起的剂量偏差。结果 EBT3胶片测量252Cf中子源步进精度可达0.01 mm；252Cf中子源位置偏差<3 mm时，剂量偏差<2.5%。结论 对252Cf中子源步进精度以及位置偏差的研究可为制订252Cf中子后装治疗机质量控制标准提供参考。
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| 关 键 词： | EBT3胶片 双电离室法 252Cf中子源 |
| 收稿时间： | 2017/1/18 0:00:00 |
Study on step accuracy measurement and dose deviation of 252Cf neutron afterloading radiotherapy machine |
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| Li Mingsheng,Jiang Qinghuan,Liu Ya and Cheng Jinsheng.Study on step accuracy measurement and dose deviation of 252Cf neutron afterloading radiotherapy machine[J].Chinese Journal of Radiological Medicine and Protection,2017,37(8):626-629. |
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| Authors: | Li Mingsheng Jiang Qinghuan Liu Ya and Cheng Jinsheng |
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| Affiliation: | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevetion, Bejing 100088, China,Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevetion, Bejing 100088, China,Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevetion, Bejing 100088, China and Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevetion, Bejing 100088, China |
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| Abstract: | Objective To study the step accuracy of 252Cf neutron afterloading radiotherapy machine and the dose deviation caused by step deviation. Methods EBT3 film was used to measure the steps of the 252Cf neutron source, and then the center of each 252Cf neutron source was identified by measuring the optical density value by using the ImageJ software. Double ion chambersmethod was used to measure the dose deviation due to the 252Cf neutron source position shift. Results 252Cf neutron source step accuracy may amount to 0.01 mm using EBT3 film measurement, when 252Cf neutron source position deviation is less than 3 mm, the dose deviation is less than 2.5%. Conclusions The study on the step accuracy and position deviation of the 252Cf neutron source can provide a reference for the quality control standard of the 252Cf neutron afterloading radiotherapy machine. |
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| Keywords: | EBT3 film Double ion chamber method 252Cf neutron source |
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