Graduate Thesis Or Dissertation

Human Eye Dosimetry: Air Gap Analysis by Shield Placement and Photon Energy

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  • When the ICRP updated their recommended limits for eye dose, they ignited a renewed interest in eye dosimetry. Especially, how the updated eye dose estimates affect current regulations and what that would mean to a radiation worker. Radiation workers are commonly required to wear leaded eyeglasses to reduce their dose to the eyes, especially the lens. However, it was unknown if additional shield placements in front of the leaded eyeglasses would result in additional protection factors over additive expectation. The goal of this study was to use a comprehensive deterministic eye model to analyze how dose to the lens of the eye would change as shielding placement changes. Stationary shields were designed to mimic a user wearing eyeglasses, and dynamic shields were placed in various positions in front of the stationary shield. With each shield placement iteration, the photon energy and shield thickness were changed from 0.25 MeV through 2.5 MeV with additional iterations with 0.662 MeV, 1.173 MeV and 1.332 MeV. The dose to the unshielded lens is compared to the dose of the lens with both shields, stationary and dynamic, to calculate a protection factor. Another protection factor was calculated but the dose to the eye was compared between the stationary shield and both the stationary and dynamic shield. These two protection factors were then compared to each other to determine the influence of shield positioning in front of the eye.
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