Experts: Forget the scale. Fukushima isn’t as bad as Chernobyl.

Fukushima was not as bad as Chernobyl. If Fukushima is a level 7 accident, maybe we need to go back and recalibrate the scale and add a level 8 or 9.
University of Southern California Prof. Najmedin Meshkati • Expressing frustration that Fukushima was rated on the same level as Chernobyl, a 7 on the nuclear accident scale. Japan’s own Nuclear and Industrial Safety Agency says it’s only 10 percent as bad as Chernobyl. On top of that, nobody has died from the post-quakeaccident and 21 workers have gotten minor illnesses from radiation. At Chernobyl, a number of people died — dozens immediately and many more from cancer years later. If we’re somehow putting Chernobyl on the same level as Fukushima, something’s wrong about the levels. source

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11.9 the current peak radiation count, in milli-sieverts per hour
400 the peak radiation count in milli-sieverts per hour – which was hit last night
300k the peak mSv/hour count at Chernobyl – to keep things in check source

» It’s no longer at its peak, and that’s a good thing: The International Atomic Energy Agency says that the decrease happened over a six-hour period. And the IAEA makes a good point that you should keep in mind. “This is a high dose-level value, but it is a local value at a single location and at a certain point in time,” they say. In other words, even if you’re within the 20-mile radius where radiation is likely to hit, the level will most assuredly be far lower than these peak levels. It’s still high, though – one milli-sievert per hour is equal to the yearly legal limit of radiation you’re supposed to get. (see our earlier posts about this topic here and here)

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400 the amount of radiation in the air, in milli-sieverts per hour, according to the given estimate
40 the amount of radiation that is, in roentgen per hour – which, don’t get us wrong, is very high
30k the amount of radiation in Chernnobyl had – which Fukushima doesn’t touch source

» This is an extremely large jump: One milli-sievert per hour is the legal annual limit for radiation in a year. Our earlier estimate showed a level of 8,217 micro-sieverts. 1,000 micro-sieverts equals 1 milli-sievert. So we went from 8,000 to 400,000 in a couple of hours. This is still no Chernobyl, but this is a huge jump. If it jumps to 1,000,000 micro-sieverts, it leads to radiation sickness – and then we’re in trouble.

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8,217 the just-reported peak of the radiation at the Fukushima plant per hour, in micro-sievert
300M the peak of Chernobyl’s radiation output per hour – at its damaged core – in micro-sievert source

» To explain: This number comparison is to emphasize the difference between an actual going-to-kill-us-all meltdown and what’s happening in Fukushima. While things could get worse from here, right now, the worst of what’s happening in Fukushima is 0.002739 percent as bad as the worst of the Chernobyl disaster. 400 rontgen is enough radiation to kill you. 10,000 micro-sievert equals 1 rontgen. Chernobyl was pushing out 30,000 rontgen per hour at its core – enough to kill someone in 48 seconds. This is an important point to make – while levels are higher than normal, this is extremely minor on the scale of a real disaster. Oh, and one more thing – Fukushima only hit its 8,217 micro-sievert peak for a very short period. Chernobyl’s level was sustained.

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12 Apr 2011 20:52