Sievert

According to Japan Times, a containment vessel at the destroyed Fukushima No. 1 power plant has reached off-the-chart radiation levels.

The reading of 530 sieverts per hour represents the highest level of radiation the reactor site has seen since March 2011 almost six years ago.

Radiation levels inside a stricken reactor at Japan's Fukushima nuclear plant have hit a record high capable of shutting down robots, in the latest challenge to efforts aimed at dismantling the disaster-hit facility.