Mittwoch, 16. März 2011

Wie groß ist die Strahlengefahr in Tokio?

Es sieht schlimm aus in Fukushima. Die Experten rechnen sogar den Fall durch, dass es bei drei Reaktoren zur Kernschmelze mit anschließender Explosion kommt. Ich habe nun eine Mail mit einer Stellungnahme von britischen Strahlenexperten erhalten. Danach sieht es für die Präfektur Fukushima schlimm aus. Selbst in den und die beiden größten Städte der Region, Koriyama und Fukushima, ist die Gefahr groß. Fukushima liegt ungefähr 70 Kilometer von den Reaktoren entfernt, Koriyama 60 Kilometer. 

Aber einer Mitschrift von einem Briefing von britischen Strahlenschutzexperten (siehe unten) besteht für Tokio keine unmittelbare und nicht einmal mittelbare Gefahr. 

Hier ist die Mitschrift auf Englisch, unkommentiert.
Subject: Making sense of it all

I have just returned from a conference call held at the British Embassy in Tokyo. The call was concerning the nuclear issue inJapan. The chief spokesman was Sir. John Beddington, Chief Scientific Adviser to the UK Government, and he was joined by a number of qualified nuclear experts based in the UK. Their assessment of the current situation in Japan is as follows:
* In case of a 'reasonable worst case scenario' (defined as total meltdown of one reactor with subsequent radioactive explosion) an exclusion zone of 30 miles (50km) would be the maximum required to avoid affecting peoples' health. Even in a worse situation (loss of two or more reactors) it is unlikely that the damage would be significantly more than that caused by the loss of a single reactor.
* The current 20km exclusion zone is appropriate for the levels of radiation/risk currently experienced, and if the pouring of sea water can be maintained to cool the reactors, the likelihood of a major incident should be avoided. A further large quake with tsunami could lead to the suspension of the current cooling operations, leading to the above scenario.
* The bottom line is that these experts do not see there being a possibility of a health problem for residents in Tokyo. The radiation levels would need to be hundreds of times higher than current to cause the possibility for health issues, and that, in their opinion, is not going to happen (they were talking minimum levels affecting pregnant women and children - for normal adults the levels would need to be much higher still).
* The experts do not consider the wind direction to be material. They say Tokyo is too far away to be materially affected.
* If the pouring of water can be maintained the situation should be much improved after ten days, as the reactors' cores cool down.
* Information being provided by Japanese authorities is being independently monitored by a number of organizations and is deemed to be accurate, as far as measures of radioactivity levels are concerned.
* This is a very different situation from Chernobyl, where the reactor went into meltdown and the encasement, which exploded, was left to burn for weeks without any control. Even with Chernobyl, an exclusion zone of 30 miles would have been adequate to protect human health. The problem was that most people became sick from eating contaminated food, crops, milk and water in the region for years afterward, as no attempt was made to measure radioactivity levels in the food supply at that time or warn people of the dangers. The secrecy over the Chernobyl explosion is in contrast to the very public coverage of the Fukushima crisis.
* The Head of the British School asked if the school should remain closed. The answer was there is no need to close the school due to fears of radiation. There may well be other reasons - structural damage or possible new quakes - but the radiation fear is not supported by scientific measures, even for children.

* Regarding Iodine supplementation, the experts said this was only necessary for those who had inhaled quantities of radiation (those in the exclusion zone or workers on the site) or through consumption of contaminated food/water supplies. Long term consumption of iodine is, in any case, not healthy. The discussion was surprisingly frank and to the point. The conclusion of the experts is that the damage caused by the earthquake and tsunami, as well as the subsequent aftershocks, was much more of an issue than the fear of radiation sickness from the nuclear plants. Let's hope the experts are right!"

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Die Rezeption ruft mich aus, ich komme, wenn ich da bin.

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