Tokyo Electric Power Corporation (TEPCO) has said that radioactive strontium up to 240 times the legal concentration limit has been detected in seawater samples collected near the earthquake-cum-tsunami hit Fukushima Daiichi nuclear plant.
The Kyodo news agency quoted TEPCO as saying that the substance was also found in groundwater near the plant''s Nos. 1 and 2 reactors.
Meanwhile, the government''s Nuclear and Industrial Safety Agency has raised its concerns saying that it is the first time that the substance has been found in groundwater.
It also said there is a need to carefully monitor the possible effects of the strontium on fishery products near the plant.