Traces of xenon detected in S. Korea following N. Korea's nuke test 2017/09/08 20:01 SEOUL, Sept. 8 (Yonhap) -- Traces of xenon gas, a radionuclide, were detected in South Korea, the nuclear safety agency said Friday, five days after North Korea conducted its most powerful nuclear test. The the radioactive material, the xenon-133 isotope, was found in the Nuclear Safety and Security Commission's analysis of ground, air and maritime samplings that were collected locally after the latest nuclear test by the North, according to the agency. Defying international warnings, North Korea conducted its sixth and most powerful yet nuclear test...