The highest radiation levels ever measured at Chernobyl were 300 sieverts per hour … an incomprehensibly high dose which can kill a man almost instantly.
To put this in perspective, radiation is usually measured in thousandths of a sievert, called millisieverts. For example, most people receive around 2.4 millisieverts per year from background radiation, or only 0.0002739726 per hour.
But a radiation level of 530 sieverts per hour has just been measured at Fukushima’s number 2 reactor.
This new record at Fukushima is 70% higher than that of Chernobyl. (The highest level previously measured at Fukushima was 73 sieverts per hour, in March 2012.)