This is exactly what I'm talking about. Yes, 4000 becquerels of Cesium 137 per kg of mushroom sure does sound scary, especially if you're raised in the German m

This is exactly what I'm talking about. Yes, 4000 becquerels of Cesium 137 per kg of mushroom sure does sound scary, especially if you're raised in the German media environment that constantly plays up the nuclear boogeyman. Cesium 137 is a beta emitter and doesn't bioaccumulate in humans. Potassium in bananas has a similar radiological and chemical properties to cesium. A kilogram of bananas is around 250 Bq of naturally occurring radioactive potassium. I'd be a lot more worried about industrial chemicals that leeched into my wild mushrooms than I would about such low levels of cesium If you ate 80,000 Bq worth of those mushrooms (i.e. you found and ate 20kg worth of the most radioactive mushrooms these people were able to find), you'd get a 1 millisievert radiation dose which is less than half of a normal person's yearly ambient radiation dose. 20kg is a *lot* of mushrooms.