Japanese nuclear plant just recorded an astronomical radiation level. Should we be worried?

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TOKYO — The utility company that operated the Fukushima Daiichi nuclear plant in Japan — the one that went into triple meltdown after the enormous 2011 earthquake and tsunami — has released some jaw-dropping figures.

The radiation level in the containment vessel of reactor 2 has reached as high as 530 sieverts per hour, Tokyo Electric Power Co. — or Tepco, as it’s known — said last week. This far exceeds the previous high of 73 sieverts per hour recorded at the reactor following the March 2011 disaster.

That was the world’s worst nuclear disaster since the one at Chernobyl, in Ukraine, in 1986. Almost 16,000 people were killed along Japan’s northeastern coast in the tsunami, and 160,000 more lost their homes and livelihoods. The cleanup is taking much longer than expected.

At this level of radioactivity, a person could die from the briefest of exposures.

Tepco recorded the radiation near the reactor core, suggesting that some melted fuel had escaped, using a long, remote-controlled camera and radiation measurement device. It was the first time this kind of device has been able to get into this part of the reactor. There it found a three-foot-wide hole in a metal grate in the reactor’s primary containment vessel.

So, how dangerous is this?

At this level of radiation, a robot would be able to operate for less than two hours before it was destroyed, Tepco said.

And Japan’s National Institute of Radiological Sciences said medical professionals had never even thought about encountering this level of radiation in their work.

According to the Kyodo news agency, the institute estimates that exposure to one sievert of radiation could lead to infertility, loss of hair and cataracts, while four sieverts would kill half the people exposed to it.

This measuring device hasn’t even gone into reactors 1 and 3 yet — that’s still in the works. (Click to Article)

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