By Tsuyoshi Inajima | BusinessWeek.com
As much as 45,000 liters (11,870 gallons) of highly radioactive water leaked from Japans crippled Fukushima nuclear station at the weekend and some may have reached the sea, Tokyo Electric Power Co. said.
The leakage shows the company known as Tepco is still struggling to control the disaster nine months after an earthquake and tsunami wrecked the plant. The water contained 1.8 millisieverts per hour of gamma radiation and 110 millisieverts of beta radiation, Tepco said in an e-mailed statement yesterday.
Workers decontaminate the roof of an Okuma town office near the tsunami-crippled Fukushima Daiichi nuclear power plant. Photograph: Kyodo/Reuters Source
The source of the beta radiation in the water is likely to include strontium 90, which if absorbed in the body through eating tainted seaweed or fish, accumulates in bone and can cause cancer, said Tetsuo Ito, the head of Kinki Universitys Atomic Energy Research Institute.
Since the March 11 disaster, the utility has reported several leaks of radiated water into the sea, though its estimates of their size have been disputed. In October, a French nuclear research institute said the Fukushima plant was responsible for the biggest discharge of radioactive material into the ocean in history.
The water leaked from a desalination unit and through a cracked concrete wall into a gutter that drains into the Pacific Ocean, spokeswoman Chie Hosoda said by phone. Radiated water has now been pumped out of the building where it was leaking from.
As much as 300 liters leaked through the crack, Junichi Matsumoto, a general manager at the utility, told reporters in Tokyo today. The utility is still checking how much contaminated water has reached the sea and the effects on the environment, Matsumoto said.
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Radiation in the sea off of Japan? We know where this is going: (link)