Osamu Tsukimori and Yuka ObayashiReutersJune 19, 2013 High levels of a toxic substance called strontium-90 have been found in groundwater at the devastated Fukushima nuclear power plant in Japan, the utility that operates the facility said on Wednesday. Strontium-90 is a by-product of the fission of uranium and plutonium in nuclear reactors as well as … Continue reading Japan finds highly toxic strontium-90 in Fukushima groundwater