Quick summary: They are putting a little over 50mL of a weakly radioactive, fast decaying isotope into the ocean. It will be undetectable within a few years.

Quick summary: They are putting a little over 50mL of a weakly radioactive, fast decaying isotope into the ocean. It will be undetectable within a few years. Natural tritium production (from cosmic rays) occurs at at a rate 3 orders of magnitude higher [0] than is occurring at Fukushima [1]. [0] https://en.wikipedia.org/wiki/Tritium#Cosmic_rays https://en.wikipedia.org/wiki/Tritium#Cosmic_rays [1] https://en.wikipedia.org/wiki/Tritium#Fukushima_Daiichi https://en.wikipedia.org/wiki/Tritium#Fukushima_Daiichi