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Radiation near a tank holding highly contaminated water at Japan’s crippled Fukushima nuclear plant has spiked 18-fold, the plant’s operator said on Sunday, highlighting the struggle to bring the crisis under control after more than two years.

Radiation of 1,800 millisieverts per hour – enough to kill an exposed person in four hours – was detected near the bottom of one storage tank on Saturday, Tokyo Electric Power Co , also known as Tepco, said.

An Aug. 22 readings measured radiation of 100 millisieverts per hour at the same tank. Japanese law has set an annual radiation exposure safety threshold of 50 millisieverts for nuclear plant workers during normal hours.

Last month, Tepco revealed that water from the tank was leaking. Japan’s nuclear regulator later raised the severity of the leak from a level 1 “anomaly” to a level 3 “serious incident” on an international scale for radiation releases.

via Reuters

Apparently, it seems the earlier the device that was used had upper limit of 100 millisieverts, which incidentally was reported. This is a clever way to control contamination. So you set your goal and make a device which an only show up to that range, and that is it. No matter how many times you take the readings it is going to be the same. Perhaps in future we would also like to ask what devices were used to detect radiation.