[1]宋婷婷,汪洋,盛晓芳,等. 医用质子加速器扩展束流与笔形束流的感生放射性辐射剂量[J].中国医学物理学杂志,2018,35(2):161-165.[doi:DOI:10.3969/j.issn.1005-202X.2018.02.008]
 SONG Tingting,WANG Yang,SHENG Xiaofang,et al. Induced radioactivity dose of extended beam and pencil beam delivered by medical proton accelerator[J].Chinese Journal of Medical Physics,2018,35(2):161-165.[doi:DOI:10.3969/j.issn.1005-202X.2018.02.008]
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 医用质子加速器扩展束流与笔形束流的感生放射性辐射剂量()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
35卷
期数:
2018年第2期
页码:
161-165
栏目:
医学放射物理
出版日期:
2018-02-08

文章信息/Info

Title:
 Induced radioactivity dose of extended beam and pencil beam delivered by medical proton accelerator
文章编号:
1005-202X(2018)02-0161-05
作者:
 宋婷婷1汪洋1盛晓芳1陈庆2李家敏2
 1.上海伽玛医院放疗科, 上海 200235; 2.淄博万杰肿瘤医院质子治疗中心, 山东 淄博 255000
Author(s):
 SONG Tingting1 WANG Yang1 SHENG Xiaofang1 CHEN Qing2 LI Jiamin2
 1. Department of Radiotherapy, Shanghai Gamma Hospital, Shanghai 200235, China; 2. Proton Therapy Center, Zibo Wanjie Cancer Hospital, Zibo 255000, China
关键词:
 医用质子加速器辐射防护感生放射性辐射剂量扩展束流笔形束流
Keywords:
 Keywords: medical proton accelerator radiation protection induced radioactivity dose extended beam pencil beam
分类号:
R144.1;R815
DOI:
DOI:10.3969/j.issn.1005-202X.2018.02.008
文献标志码:
A
摘要:
 目的:通过比较医用质子加速器两种不同束流引出方式的X/γ射线感生放射性辐射剂量差异,从而采取相应措施降低治疗室的环境辐射水平,减少医用质子加速器工作人员的累积辐射剂量。 方法:模拟患者治疗的肿瘤辐射野,分别在质子加速器扩展束流治疗室和笔形束流治疗室进行15 CGE的质子射线照射,射线停止60 s后,进入治疗室利用两台NeutronRAE II检测仪同时对射线输出窗口和治疗床等中心这两个位置进行X/γ射线感生放射性辐射剂量测量,并记录数据。按以上出束条件和测量步骤,重复测量3次,每次间隔30 min。 结果:扩展束流射线输出窗的3次测量值依次为32.3、63.2、70.1 μSv/h,在治疗床等中心的3次测量值依次为4.5、5.6、7.7 μSv/h,两个测量点的感生放射性辐射剂量率均随着测量次序依次增加。笔形束流射线输出窗的3次测量值依次为3.2、2.3、2.1 μSv/h,在治疗床等中心的3次测量值依次为0.21、0.18、0.18 μSv/h,两个测量点的感生放射性辐射剂量率均与测量次序无关。在输出窗位置,扩展束流的测量平均值是笔形束流测量平均值的21.8倍;在治疗床等中心位置,扩展束流的测量平均值是笔形束流测量平均值的31.2倍。 结论:在出束剂量和时间相同的情况下,笔形束流的感生辐射剂量较小,其机房环境辐射水平远远低于扩展束流机房,对工作人员有更好的保护作用。
Abstract:
 Objective To compare the difference of X/γ ray induced radioactivity doses between extended beam and pencil beam delivered by medical proton accelerator, and explore some countermeasures for decreasing the irradiation level in the therapy room and reducing the annual accumulated irradiation doses of related staff. Methods After the tumor radiation field was simulated, 15 CGE dose was separately delivered by medical proton accelerator in extended beam therapy room and pencil beam therapy room. Sixty seconds after beam-off, two neutron radiation detectors (Neutron RAE II detectors) wereused to simultaneously measure the induced radioactivity dose at the output window center and therapy couch isocenter. We recorded the measurements and repeated the measurement three times at a 30-minute interval. Results The three measurements of induced radioactivity dose rates of extended beam at the beam output window were 32.3, 63.2, 70.1 μSv/h; the measurements at the center of the treatment couch were 4.5, 5.6 and 7.7 μSv/h, which indicated that the induced radioactivity dose rates at both measurement points increased with the measuring sequence. The three measurements of pencil beam at the beam output window were 3.2, 2.3, 2.1 μSv/h, and those at the center of the treatment couch were 0.21, 0.18, 0.18 μSv/h, which revealed that the induced radioactivity dose rates at the two measuring points did not increase with the measuring sequence. In the output window, the mean value of measurements of extended beam was 21.8 times larger than that of the pencil beam; at the center of the couch, the average value of measurements of extended beam was 31.2 times larger than that of pencil beam. Conclusion With the same deliver dose and beam-on time, the induced radioactivity dose of pencil beam was less than that of extended beam, and the environmental radiation level was far lower in pencil beam therapy room than extended beam therapy room, which provides a better protection to the related staff.

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备注/Memo

备注/Memo:
 【收稿日期】2017-08-28
【作者简介】宋婷婷,物理师,研究方向:肿瘤精确放疗和放射防护,E-mail: gnitlp@163.com
【通信作者】陈庆,物理师,研究方向:质子治疗医学放射物理及放射防护,E-mail: Dawsonchen@126.com
更新日期/Last Update: 2018-01-29