Modeling Eye Lens and Its Conversion Coefficients Using MCNP6
Niemisto, Matti Guenter
Benevides, Luis A
Recent studies have found the lens of the human eye to be more radiosensitive than previously thought with a questionable threshold dose for cataractogenesis. Radiation protection protocols and regulations rely on ICRP publications of dose conversion coefficients for various organs including the eye lens. Eye lens conversion coefficients are based on simulated dosimetry experiments with constructed stylized eye models, either alone or embedded in MIRD-5 phantom models. The PIMAL model (Phantom with Moving Arms and Legs) is a relatively new full-body computational phantom featuring adjustable extremities. The eye of the PIMAL phantom is a simple single substance sphere. Monte Carlo N-Particle transport code (MCNP6) was used to construct a new stylized eye model based on the latest anatomical specifications found in published literature. The constructed stylized eye model was embedded into the PIMAL model and Monte Carlo simulated photon dosimetry experiments were conducted at energy levels between 0.005 MeV and 10 MeV using MCNP6 to obtain eye lens conversion coefficients. Our resulting conversion coefficient distributions closely matched with conversion coefficient distributions of other constructed models we simulated and with those found in the literature. The findings provide a basis for further development of PIMAL with a stylized eye model for better accuracy of future computational dosimetry simulations of real-life exposure scenarios to improve eye lens radiation protection recommendations.
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