Radiation levels inside a damaged reactor at the Fukushima Daiichi nuclear power station are at their highest since the plant suffered a triple meltdown almost six years ago. Tokyo Electric Power [Tepco], the plant’s operator, said atmospheric readings of up to 530 sieverts an hour had been recorded inside the containment vessel of reactor No.2, one of three that experienced a meltdown when the plant was crippled by a tsunami that struck north—east Japan in March 2011. The readings highlight the scale of the task confronting thousands of workers, as pressure builds on Tepco to start decommissioning the plant, a process expected to take about four decades.’ (More likely ten decades — Ed.). The readings, described by some experts as “unimaginable”, are far higher than the previous record of 73 sieverts an hour in that part of the reactor. A single dose of 1 sievert is enough to cause radiation sickness and nausea, 5 sieverts would kill half ofthose exposed to it within a month, and a single dose of 10 sieverts would prove fatal within weeks.
from The Guardian 4th February 2017