介入放射工作者眼晶状体受照剂量测量方法的研究
Study on Measurement Methods for Radiation Exposure Dose in Human Lens of Interventional Radiologists
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摘要:
目的 探讨肝动脉栓塞化疗术中放射工作者眼晶状体累积受照剂量的测量方法。
方法 用仿真人体模型模拟肝动脉栓塞化疗术常用投照体位及投照条件，用眼晶状体剂量计
H p（3）测量模体眼晶状体部位（内测法）的累积受照剂量，用热释光（TLD）元件测量模体眼睑部位（外测法）的累积受照剂量，比较两种方法所测结果的差异。结果 无铅眼镜防护状态下，内测法累积受照剂量当量为左眼（54.1±2.3）μSv，右眼（18.9±0.8）μSv，右眼累积受照剂量低于左眼（
t =-63.31，P <0.05）；外测法累积受照剂量当量为左眼（67.1±1.2）μSv，右眼为（62.3±1.4）μSv，右眼累积受照剂量低于左眼（t =-11.71，P <0.05）；两种测量方法中佩戴铅眼镜后左眼晶状体累积受照剂量当量可减少约30%~70%，但铅眼镜对右眼晶状体的防护效果不如左眼（t =0.11，t =0.03，P >0.05）。结论 两种测量方法中左眼晶状体受照剂量的结果相近，测量右眼晶状体受照剂量时，外测法结果明显高于内测法，此法可能高估右眼晶状体受照剂量，最大误差为65%。
Abstract:Objective To study the methods for estimating cumulative exposure dose in human lens of the medical radiation workers in hepatic arterial chemoembolization.
Methods Alderson Radiation Therapy (ART) phantom was used to simulate the scenario commonly used in hepatic arterial chemoembolization according to the position and projection conditions.Human lens dosimetry
H p (3)was used to estimate the cumulative exposure dose of the human lens in the ART phantom (internal measurement method),and at the same time thermoluminescence (TLD) elements on eyelids were used to estimate the dose (external measurement method).Then the difference of two kinds of measurement results was calculated.Results When lead glasses were off,for internal measurement method,the cumulative exposure dose to right lens(18.9±0.8)μSvwas lower than that to left lens(54.1±2.3)μSv(
t =-63.31,P <0.05).For external measurement method,the cumulative exposure to right lens(62.3±1.4)μSvwas also lower than that to left lens(67.1±1.2)μSv(t =-11.71,P <0.05).The cumulative radiation exposure doses to left eye lens were attenuated by 30%-70% when lead glasses were on;however,the protection effect of lead glasses to right lens was not as good as that to left lens (t =0.11,t =0.03,P >0.05).Conclusion The results of the two measurement methods are similar for left human lens,but for right lens the cumulative dose equivalent detected by external measurement method is significantly higher than that by internal measurement method.Therefore,
H p (3) may overestimate the cumulative exposure dose to right human lens with a maximum error of 65%.
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