目标:2018年初,欧盟实施了每年20mSv职业暴露于电离辐射的新眼睛晶状体剂量限制。荷兰指南指出,监测是强制性的,高于15mSv/年的预期眼晶状体剂量。在这项研究中,我们提出了一种方法来研究介入医生的眼晶状体剂量是否会超过15mSv/年,并确定眼晶状体剂量是否可以从常规的个人剂量计测量中得出。
方法:眼睛晶状体剂量,HP(3),介入放射科医生(n=2),Máxima医疗中心的心脏病专家(n=2)和血管外科医生(n=3),荷兰,在六个月内测量,在额头上使用热释光剂量计。同时,表面剂量,Hp(0,07),和全身剂量,Hp(10),在胸部水平的铅裙外使用常规剂量计进行测量。剂量计每四周同时刷新一次。将眼晶状体剂量与两个身体佩戴的剂量计值进行比较。在血管造影套件中进行测量,导管实验室和混合或。
结果:在两个剂量计之间观察到明显的关系:Hp(3)≈0.25Hp(0,07)。对于任何干预医生,眼晶状体的外推年度剂量均不超过15mSv(平均3至10项研究/月)。
结论:可以通过常规剂量计在胸部水平间接监测眼晶状体剂量。此外,根据测量结果,我们得出的结论是,所有被监测的干预医生仍低于眼晶状体剂量的剂量限值和强制监测限值。
OBJECTIVE: Early 2018, the new eye lens dose limit of 20 mSv per year for occupational exposure to ionising radiation was implemented in the European Union. Dutch guidelines state that monitoring is compulsory above an expected eye lens dose of 15 mSv/year. In this study we propose a method to investigate whether the eye lens dose of interventionalists would exceed 15 mSv/year and to determine if the eye lens dose can be derived from the regular personal dosimeter measurements.
METHODS: The eye lens dose, Hp(3), of interventional radiologists (n = 2), cardiologists (n = 2) and vascular surgeons (n = 3) in the Máxima Medical Centre, The Netherlands, was measured during six months, using thermoluminescence dosimeters on the forehead. Simultaneously, the surface dose, Hp(0,07), and whole body dose, Hp(10), were measured using regular dosimeters outside the lead skirt at chest level. The dosimeters were simultaneously refreshed every four weeks. The eye lens dose was compared to both the body-worn dosimeter values. Measurements were performed in the angiography suite, Cath lab and hybrid OR.
RESULTS: A clear relation was observed between the two dosimeters: Hp(3) ≈ 0,25 Hp(0,07). The extrapolated year dose for the eye lens did not exceed 15 mSv for any of the interventionalists (average 3 to 10 studies/month).
CONCLUSIONS: The eye lens dose can be monitored indirectly through the regular dosimeter at chest level. Additionally, based on the measurements we conclude that all monitored interventionalists remain below the dose limit and compulsory monitoring limit for the eye lens dose.