S. Korea checks radiation on arrivals from Japan 17 Mar 2011 South Korea on Thursday started checking radiation levels for people arriving from quake-hit Japan as part of its efforts to better protect public health, the government said. The science ministry and the state-run Korea Institute of Nuclear Safety (KINS) said residual radiation detection gates have been set up at Incheon and Gimpo international airports that have direct flights to Japan. Both Incheon and Gimpo airports, located near Seoul, currently have two gates each that are able to detect even the minutest traces of radiation.