Japan is set to begin pumping out more than a million tonnes of treated water from the destroyed Fukushima Daiichi nuclear power plant this summer, a process that will take decades to complete.
The water was distilled after being contaminated from contact with fuel rods at the reactor, destroyed in a 2011 earthquake. Tanks on the site now hold about 1.3 million tonnes of radioactive water - enough to fill 500 Olympic-sized swimming pools. Here is how Tokyo Electric Power CompanyTepco has been filtering the contaminated water to remove isotopes, leaving only tritium, a radioactive isotope of hydrogen that is hard to separate from water.
Tritium is considered to be relatively harmless because it does not emit enough energy to penetrate human skin. But when ingested it can raise cancer risks, a Scientific American article said in 2014.
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