Based on the calculations of Michio Aoyama (Meteorological Research Institute, Japan) 60 GBq of cesium 137 and strontium 90 have leaked out of Fukushima Daiichi to the Pacific ocean on a daily basis since the initial disaster.
Some additional calculation of his numbers shows that in the last two years 43.8 Tbq of the two isotopes has leaked out. We used two years since most of the initial release estimates were created using time frames from weeks up to 6 months to show the big releases from the plant. So after those big releases another 43.8 Tbq leaked to the sea. This does not include what continues to leak out of the plant to the air. It also does not include other isotopes such as cesium 134, tritium, radioactive silver, cobalt 60, ruthenium, plutonium or the many other substances known to have been leaking out of the plant. These daily leaks to the sea may explain why contamination in fish has not gone down.
60 GBq of Cs137 & Sr90 directly go out to ocean outside of the Fukushima Daiichi port daily
GBq (gigabecquerel, 10 to 9th Bq)
Times 2 years = 43,800,000,000,000
TBq (terabecquerel, 10 to the 12th Bq)
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