Georadiological Barrier Gamma Attenuation Model for Waste Containment. Il: Model Implementation

摘要

Herein, the Georadiological Barrier Gamma Attenuation Model that is developed in Part 1 of this paper, is utilized to estimate the attenuation of gamma (__) rays by earthen barriers of various thicknesses and material composition. Activities of radioactive isotopes are calculated and coupled with an exponential absorption equation, to estimate y exit intensities from these georad barriers. The results indicate that __ attenuation by georad barriers is more significantly affected by barrier thickness than by barrier density. A 33% increase in thickness from 15 to 20 cm produces a 50% reduction in emitted __ intensity, while a 33% increase in density from 1.5 to 2.0 g/cm3 produces a 19% reduction for a barrier comprising 45% sand, 25% clay, and 30% water (by weight). This model can be used to optimize barrier material mix composition, density, and thickness to increase __ attenuation in emergency response at existing radiologically contaminated sites and during response scenarios.