Graduate Thesis Or Dissertation

Design and analysis of radiation shielding eyewear

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  • The recent reductions to the international dose limit recommendations for the lens of the eye have renewed interest in radiation protection strategies in interventional fluoroscopy, where eye-lens radiation exposure occurs frequently. Radiationshielding eyewear can significantly reduce lens dose in these scenarios, but accurate protection factors are elusive because they depend on a variety of factors. This work aims to investigate variables that affect eye shield performance in fluoroscopy rooms, test several shield designs, and rate the shield designs based on shielding performance. Eight separate shields were modeled in MCNP5 using detailed head and eye geometry, and the shields were evaluated at eight individual source positions. Results showed that shields of different thicknesses and shapes can provide similar protection to the operator. A total protection factor of about 5 is the most protection a 0.10 mm lead equivalent material can reasonably provide, and small shields constructed of this material can provide protection factors of about 3. Shield performance can vary greatly depending on the irradiation angle, and this could cause an overestimation of the dose reduction provided by the shield if vulnerable angles are exploited. With increasing evidence of cataract risk at low lens doses, fluoroscopy operators need radiation protection equipment that can provide well characterized protection, and radiation-shielding eyewear can provide excellent dose reduction if they are designed well and used correctly.
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