Initial and residual radiation up to now might be able to be computed for the atmospheric and underwater detonations, and we could actually darken the entire map, as the timeline is being brushed from left to right. On the right end of the brushed part (the last year being highlighted), there would have to be a little indicator since that is the year whose radioactivity corresponds with the map. And this feature could be turned on and off by the user if the map's darkness is too distracting.
Initial and residual radiation up to now might be able to be computed for the atmospheric and underwater detonations, and we could actually darken the entire map, as the timeline is being brushed from left to right. On the right end of the brushed part (the last year being highlighted), there would have to be a little indicator since that is the year whose radioactivity corresponds with the map. And this feature could be turned on and off by the user if the map's darkness is too distracting.
Ionizing radiation—5% of total energy (more in a neutron bomb) or Residual radiation—5–10% of total energy - http://en.wikipedia.org/wiki/Effects_of_nuclear_explosions
We could scare people by linking them with the lethality vs dose graph here http://www.fas.org/nuke/intro/nuke/radiation.htm