摘要
目的研究车载设备中水模散射对周围剂量分布的贡献,并对辐射防护提出优化建议,控制放射工作人员职业病风险。方法结合实际测量与蒙特卡罗方法,在X射线体检台后增加剩余X射线吸收装置,研究车载DR机房水模体对辐射剂量的影响,提出屏蔽优化意见并评估其效果。结果使用水模时计数点辐射剂量均大于无水模时的情况,最大可达15.7倍;剩余X线吸收装置可有效降低计数点辐射剂量,无水模时最大降低77%,放置水模时最大降低27%;计数点辐射剂量70%以上来自水模散射;车箱顶部与底部铅当量从0增加到2 mm时,对应的周围剂量当量可降低70%以上。结论车载DR车厢周围的辐射剂量主要来自水模散射,增加车厢顶部与底部铅屏蔽可以有效降低周围剂量,提高屏蔽能力。
Objective To study the contribution of water phantom scattering to the ambient dose distribution in vehicle mounted equipment,and to put forward the optimization suggestions for radiation protection,so as to control the occupational disease risk of radiation workers.Methods Combined with the actual measurement and Monte Carlo method,the residual X-ray absorption device was added behind the X-ray examination table to study the influence of the water phantom in the vehicle DR room on the radiation dose,put forward the shielding optimization suggestions and evaluate the effect.Results The radiation dose of counting points when usedwater phantom was 15.7 times higher than that withoutwater phantom;the residual X-ray absorption device couldeffectively reduce the radiation dose of counting points,the maximum reduction was 77% when there was no water phantom,and the maximum reduction was 27% when the water phantomwas placed;more than 70% of the radiation dose of counting points scattered from water phantom;the lead equivalent at the top and bottom of carriage increased from 0 to 2 mm,The corresponding ambient dose equivalent couldbe reduced by more than 70%.Conclusion The radiation dose around the vehicle DR mainly comes from water phantom scattering.Increasing the lead shielding at the top and bottom of the carriage can effectively reduce the surrounding dose and improve the shielding ability.
作者
陈龙
高韩
李想
高宇楠
汤薇
涂彧
闫聪冲
孙亮
CHEN Long;GAO Han;LI Xiang;GAO Yu-nan;TANG Wei;TU Yu;YAN Cong-chong;SUN Liang(State Key Laboratory of Radiation Medicine and Protection,School of Radiation Medicine and Protection,Soochow University,Suzhou 215123,China)
出处
《工业卫生与职业病》
CAS
2021年第4期278-281,共4页
Industrial Health and Occupational Diseases
基金
国家自然科学基金(11575124)
国家核能开发项目资助(2016-1295)。
关键词
车载DR
水模散射
蒙特卡罗方法
辐射防护
Vehicle DR
Water phantom scattering
Monte Carlo method
Radiation protection
