The operator of the stricken Fukushima Daiichi nuclear power plant says 7.5 million times the legal limit of radioactive iodine 131 has been detected from samples of seawater near the plant.

Tokyo Electric Power Company, or TEPCO, found on Saturday that contaminated water was leaking from a cracked concrete pit near the No. 2 reactor.

Experts say this makes it clear that highly radioactive substances from the reactor are flowing into the sea, and that the leak must be stopped as soon as possible.

The utility firm said samples of water taken near the water intake of the No. 2 reactor at 11:50 AM Saturday contained 300,000 becquerels of iodine 131 per cubic centimeter, or 7.5 million times the legal limit.
TEPCO said the figure had dropped to 200,000 becquerels per cubic centimeter, or 5 million times the legal limit, in samples taken at 9:00 AM Monday.

300 Mbq per Kg

or  300 Gbq per m cubed

Any idiot can face a crisis - it's day to day living that wears you out.