This video illustrates the radioactive contamination from Fukushima. It's very interesting to see the general public make their own measurements and draw their own conclusions and make those conclusions publicly available. For example, the person in the video concludes that it's "dangerous to be ingesting that". Is it?:
It's hard to say. Seaweed contains a lot of natural potassium, which includes natural, radioactive K-40. But, it also concentrates iodine, which is a fission product released from Fukushima. It may have also concentrated other isotopes.
A spectroscopic analysis is needed.
I totally agree with you on this one.
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