Around the port of Fukushima Daiichi Nuclear Power Station Radioactive cesium concentration March 14, 5:00 which is lower than the national standard
Regarding the concentration of radioactive cesium in seawater inside and outside the harbor of TEPCO's Fukushima Daiichi Nuclear Power Station, which occurred nine years ago, immediately after the accident, there were places in high places exceeding 600,000 becquerels per liter. However, since then, it has fallen significantly, and as of last month, everywhere was below national standards.
TEPCO currently measures and publishes radioactive material concentrations at 17 locations, 9 locations inside the port of Fukushima Daiichi Nuclear Power Plant and 8 locations within 1 km offshore outside the port. Is.
The radioactive cesium-137, which has a relatively long “half-life” of 30 years, in which the amount of radioactive material is reduced by half, shows that immediately after the accident, the high concentration of contaminated water spilled out. Some places exceeded 600,000 becquerels.
However, it has fallen significantly over the next nine years, and as of last month, all measurements inside the port are below the national standard of 90 becquerels per liter.
Outside the harbor, most are below the limits that can be detected by the measuring device, and even if they are detected, they are well below the national standards, at about 1 becquerel per liter.
TEPCO has set up a wall on the sea side of the site in 2015 to prevent contaminated water from flowing into the sea, and it has been said that the concentration has declined since then.