Indoor concentrations of radioactive aerosols from nuclear accidents.

This article focuses on a theoretical model developed to estimate indoor concentrations of radioactive aerosols resulting from nuclear accidents, with particular application to the 2011 Fukushima-Daiichi nuclear power plant incident in Japan. Using computational fluid dynamics (CFD) approaches, the model incorporates key parameters such as aerosol deposition velocities, deposition rates, and penetration factors through building cracks to predict indoor aerosol levels based on outdoor concentrations. Applying the model to radionuclides iodine-131, cesium-134, and cesium-137 from Fukushima, it estimates indoor concentrations to be approximately 96–97% of outdoor levels under typical ventilation and room conditions. The study highlights the model’s practicality for rough estimations while acknowledging variability due to factors like accident magnitude, location, and time since release.