Also radioactive cesium was detected in deeper groundwater at No.4 unit’s well, as fears grow of a new leak into the ocean.
The level of beta ray-emitting radioactivity in groundwater around the crippled Fukushima reactor No. 2 reactor has been rising since November, NHK reported.
Previous the highest level – 1.8 million becquerels (bq/liter), of beta-ray sources per liter – was registered at reactor No.1 on December 13.
Meanwhile, TEPCO’s latest examination of deeper groundwater beneath the #4 reactor’s well has raised new concerns that there might be another source of radioactive substances leakage into the ocean.
For the first time, the analysis of water samples taken from a layer 25 meters beneath the No. 4 reactor’s well that is facing the ocean has revealed radioactivity in groundwater, RT reported.
TEPCO investigators detected 6.7 bq/liter of Cesium 137 and 89 bq/liter of strontium as well as other beta ray-emitting radioactive substances.