AdvertisementChallenges Loom Large, 25 Years After ChernobylApril 26, 2011Christopher JoycefacebookEmailA technician checks a spot with a Geiger counter in a forest that burned in 1992. The wildfire released radioactive particles into the air that were deposited there during the 1986 nuclear accident at Chernobyl. Experts worry nearby forest, which is becoming overgrown, could again be ripe for a blaze. (Getty Images)