@Pacific:
An atom bomb strike also affects the sea or land space that it’s dropped in for a period of time.Â
Over the years, I’ve gradually upgraded (as various games have appeared on the market to provide new pieces) the sculpts I use to represent nukes in board games. For the bombs themselves, I use the eight white missile sculpts from Superpowers:
http://www.boardgamegeek.com/image/495090/superpowers?size=large
The sculpts look more bomb-like when they’re horizontal rather than vertical, so as an added refinement I mount them on the eight black plastic slotted boss card holders from Risk: Metal Gear Solid.
For detonated bombs, I use the black plastic mushroom cloud sculpts from The Sushi-Jalapeno War by Xeno Games:
http://www.boardgamegeek.com/image/108844/sushi-jalapeno-war?size=large
As post-explosion markers, I originally used the cardboard nuclear tokens from East & West…
http://www.boardgamegeek.com/image/99821/east-west-global-war-in-1948?size=large
…but I later switched to the plastic nuclear hazard tokens produced by Litko Game Accessories:
http://www.litko.net/products/Nuclear-Hazard-Token-Set.html
The Litko tokens are rather big, however, so I’m thinking of getting the radiation markers produced by HBG…
http://www.historicalboardgaming.com/HBG-Radiation-Marker-_p_734.html
…which are better sized but which (unlike most of HBG’s battle markers) are made of cardboard rather than acrylic. (If HBG has any plans to produce an acrylic version of its radiation marker, that would be great news.)