(a) ¹³¹I deposition concentration and (b) inhalation thyroid dose (spatially) averaged over the model domain and integrated to 24 h after the start of the release, for varying numbers of simulations using a Monte Carlo sampling method. Ensemble mean = dashed line. Ensemble median = solid line. Region of lightest shading = 0th to 100th percentile range. Region of darker shading = 20th to 80th percentile range. Region of darkest shading = 40th to 60th percentile range.