某院PET/CT室护士胸部和手指受照剂量分析

Analysis of radiation dose for PET/CT nurse at a hospital

目的本文通过记录PET/CT室从事注射工作的护士全身和手指辐射剂量,获取对其辐射防护有意义的数据。方法将热释光剂量计(TDL)分别置于两名护士的左右手指、左胸部铅衣外侧和铅衣内侧,通过监测周期内的受照剂量和记录的注射次数,计算护士平均每次注射手指受照剂量和铅衣的屏蔽效果。结果两名护士左手指受照剂量均大于右手指,平均每次注射受照剂量为:5.8~13.0μSv,二者手指的受照剂量当量相差0.4~0.8倍;铅衣内侧剂量值小于铅衣外侧,射线衰减率为2.8%~6.6%。结论PET/CT室从事^18F注射的护士,其手指受照剂量主要取决于其注射次数、注射药物的剂量及注射操作熟练程度;铅衣的防护效果很有限。只有通过提高护士注射操作熟练程度,缩短接触^18F时间才能有效地减少护士的辐射剂量。

Objective In this study,significant data on radiation protection obtained by recordingthe whole-body and the fingerradiation dose of nurses engaged in injection inthe PET/CT room,to implement some techniquesfor the radiation protection of the nurses.Methods Thethermoluminescence dosimeter(TDL)worn on the left and right fingersof two nurses,placed on the outside and inside of the lead-based shielding vestments of the left chest to measure the radiation dose.The average exposure dose of one injection and the protective effect of lead-based shielding vestment can be calculated by the numbers of injects and the dose of the nurses during the monitoring period.Results The exposed dose of the left fingers of the two nurses was largerthan that of the right finger,and the average dose of one injection was 5.8~13.0μSv,the difference was0.4 to 0.8 times;The dose value ofthe inside of the vestment was less than that the outside,and the radiation attenuation rate of the vestment was between 2.8%and 6.6%.Conclusion For nurses engaged in 18F injection in the PET/CT room,the finger dose mainly depends on the number of injections,the dose of injection drugs and the proficiency in the injection.The protective effect of lead-based shielding vestment is very limited.The nurses can be effectively protected only by improving proficiency in injection operation and shortening the exposure time of ^18Fradiation.