via NHK / January 10, 2014 /
Nuclear regulators will discuss measures to prevent the increase of radiation levels around the crippled Fukushima Daiichi plant.
The level of radiation at the plant’s border rose to more than 8 milisieverts in annualized figures in December, from less than 1 milisievert in March in the same year.
The regulators say that’s due to the increasing number of storage tanks for radioactive water at the plant. There are now about 1,000 tanks at the site.
They explained that the water basically emits beta-rays, which are too weak to penetrate the steel tanks. But they say, when beta-rays hit metals, stronger X-rays come out of the tanks, affecting the environment.