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I know because I argued with a friend from Bavaria about this, and he pulled the actual radiologic data for me, and the cesium doses are so low that they can be only detected because the modern equipment is very sensitive, and they definitely have no biological effect.
Same story with recent news by EU Greens about "forest fires in Chernobyl released radioactivity". The detected increase was 1 nSv which is 1/1000 of the background radiation anywhere on Earth 🤦♂️