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Estimation of the absorbed dose in radiation-processed food--1. Test of the EPR response function by a linear
M F Desrosiers1, G L Wilson, C R Hunter
1Center for Radiation Research, National Institute for Standards and Technology, Gaithersburg, MD 20899.
Abstract:
Free radicals produced in chicken bone tissue by 137Cs gamma-rays were measured using electron paramagnetic resonance spectroscopy. The yield of radicals was found to be proportional to the absorbed dose. Additive re-irradiation of previously irradiated bones is the basis of a method to estimate the absorbed dose in radiation-processed foods. The ability of the method to provide accurate dose assessments for a range of doses (0.5-7.4 kGy) is tested here. A linear fit to the data yields reasonable dose estimates for bone irradiated less than 2 kGy, but fails at the higher doses using a linear approximation to the dose response. These data and their implications are discussed.