Abstract
In 2011, the International Commission on Radiological Protection reduced the occupational eye lens dose limit from 150 mSv to 20 mSv per annum, averaged over a defined period of 5 years. Transposition into Irish legislation by February 2018 of Council Directive 2013/59/Euratom on Basic Safety Standards will see this become the revised legal occupational eye lens dose limit. This has significant implications for Interventional Radiology and Cardiology where staff doses can be particularly high. The aim of the study is to investigate the dose distribution across the eyes of operators performing fluoroscopy guided procedures in a dedicated IR room, equipped with a Siemens Axiom Artis dTa C-arm system with flat-panel detector. There is a ceiling-suspended lead glass shield, which is typically interposed between the detector and the operator. Measurements will be carried out with the CIRS ATOM model 702 adult female. This phantom is sectioned and drilled to accept TLDs, and there are two TLD holes in each eye. The dose will be measured during simulation using calibrated Harshaw TLD-100H dosimeters placed within the cavities and on the lens of each eye of the phantom, and on the inner and outer surface of the lens and frame of lead glasses worn by the phantom. Eye-D dosimeters (Landauer Nordic, Sweden) will also be used, to allow comparison with Hp(3). The study will evaluate several models of lead glasses, inform the optimum position of an eye dosimeter, and establish the relationship between the dose measured at that point and the eye lens dose.
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