| 回旋加速器工作场所辐射水平的调查与分析 |
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| 引用本文： | 马永忠,王宏芳,冯泽臣,朱维杰,孙亚茹,娄云,万玲,孟庆华,田青香. 回旋加速器工作场所辐射水平的调查与分析[J]. 国际放射医学核医学杂志, 2015, 39(5): 407-411. DOI: 10.3760/cma.j.issn.1673-4114.2015.05.013 |
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| 作者姓名： | 马永忠 王宏芳 冯泽臣 朱维杰 孙亚茹 娄云 万玲 孟庆华 田青香 |
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| 作者单位： | 100013，北京市疾病预防控制中心放射卫生防护所 |
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| 摘 要： | 目的 调查回旋加速器工作场所辐射剂量水平及其分布状况, 以期更好地指导现场人员的防护并为放射性药物生产场所的屏蔽设计提供技术依据。 方法 以某医院安装的1台HM-20S型回旋加速器及其放射性药物生产场所为研究对象, 使用LiF(Mg, Cu, P)热释光剂量计、CR39中子剂量计、NH-1B中子剂量当量率仪和451B剂量巡测仪测量加速器室内中子和γ射线辐射剂量率, 并对室外关注点的辐射水平进行验证。 结果 在质子能量20 MeV、束流100 μA条件下, 回旋加速器自屏蔽体南侧表面中子最高剂量率为北侧表面的63倍、γ射线最高剂量率为北侧的6. 0倍; 机房南墙内表面中子和γ射线剂量率分别为北墙内表面的11倍和5. 3倍; 机房东墙内表面中子和γ射线剂量率平均值分别为21 μSv/h和45 μSv/h, 西墙内表面中子和γ射线剂量率平均值分别为34 μSv/h和69 μSv/h。 结论 回旋加速器室内辐射水平及其分布状况与束流方向和靶位置等因素密切相关, 其实测值可用于指导场所的屏蔽设计和人员防护。
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| 关 键 词： | 回旋加速器 回旋加速器室 辐射剂量 辐射防护 |
| 收稿时间： | 2015-06-30 |
Investigation and analysis of radiation dose levels in a cyclotron room |
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| Yongzhong Ma,Hongfang Wang,Zechen Feng,Weijie Zhu,Yaru Sun,Yun Lou,Ling Wan,Qinghua Meng,Qingxiang Tian. Investigation and analysis of radiation dose levels in a cyclotron room[J]. International Journal of Radiation Medicine and Nuclear Medicine, 2015, 39(5): 407-411. DOI: 10.3760/cma.j.issn.1673-4114.2015.05.013 |
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| Authors: | Yongzhong Ma Hongfang Wang Zechen Feng Weijie Zhu Yaru Sun Yun Lou Ling Wan Qinghua Meng Qingxiang Tian |
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| Affiliation: | Institute of Radiohygiene Protection, Beijing Center for Disease Control and Prevention, Beijing 100013, China |
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| Abstract: | Objective Levels and distribution of radiation dose in a cyclotron room were investigated to guide protection of personnel against radiation onsite and provide technical basis for the shielding design of workplaces with radioactive drugs. Methods A cyclotron HM-20S and the room in a hospital where it was installed were investigated. Several LiF(Mg, Cu, and P) thermoluminescence dosimeters, CR39 neutron dosimeters, a neutron dose equivalent rate meter NH-1B, and a dose survey meter 451 B were used to measure the neutron and gamma radiation dose rates in the cyclotron room. Radiation dose levels outside the room were also validated. Results When irradiation conditions were 20 MeV of proton energy and 100 μA of beam current, the maximum neutron dose rate from the southern surface of the self-shielding body of the equipment was 63 times higher than that from northern surface of the self-shielding body. Additionally, the maximum gamma-ray dose rate of the southern surface was 6. 0 times higher than that of the northern surface. Neutron and gamma-ray dose rates measured on the inner surface of the southern wall were 11 and 5. 3 times higher than those measured on the inner surface of the northern wall, respectively. In addition, mean values of neutron and gamma-ray radiation dose rates from the inner surface of the eastern wall were 21 and 45 μSv/h, correspondingly, whereas those from the western side were 34 and 69 μSv/h, respectively. Conclusion Levels and distribution of radiation dose in a cyclotron room are closely related to several factors, such as beam direction and target position. Radiation dose values measured onsite can be used to facilitate the shielding design of workplaces and provide radiation safety for personnel. |
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| Keywords: | Cyclotron Cyclotron room Radiation dose Radiation protection |
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