Sorry for bringing up a dead topic but apropos Chernobyl, I shot part of a film there recently. We were looking for the exact some thing, a post-apocalyptic type city, and Pripyat certainly works, although Soviet-style towns that were built in the 70s and 80s from scratch are a bit odd in that when they're empty they seem more like full-scale model cities than actual real organic cities. The radiation isn't a big deal as long as long as you don't overdo it. And someone somewhere mentioned something about it affecting film somehow, well, it doesn't. The Russian x-ray machines at the airport in Kiev on the other hand...