The article doesn't say, but I expect that the water that they intend to dump has had as much radioactive materials removed as humanly possible.
Quote:
Originally Posted by Tobra
When the concentration achieves equilibrium, the dilution factor described applies. It will be more concentrated in the Pacific until that happens.
What could possibly go wrong in the meantime
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Here's an interesting read.
https://phys.org/news/2016-07-pacific-ocean-fukushima.html
Quote:
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...after analysing data from 20 studies of radioactivity associated with the plant, it found radiation levels in the Pacific were rapidly returning to normal after being tens of millions of times higher than usual following the disaster.
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