The Institute for Radiological Protection and Nuclear Safety (IRSN) reported that from March 21st to mid-July, 27.1 peta becquerels (a unit used to measure radioactivity) of caesium 137 had entered into the ocean. One “peta” becquerel is equivalent to a million billion becquerels, or 10^15.
The IRSN stated in a press release that this is the biggest single outflow of man-made radioactive materials introduced to the marine environment ever seen or recorded. It will take 30 years for the caesium to lose ½ of its radioactivity, as it is a slow decaying element. IRSN also found large quantities of iodine 131, though it does not pose any threat due its very low 8-day half-life.
The caesium, however, is a major concern to environmentalists. The problem with this hypothesis is that scientists have simply not seen such a large quantity of caesium introduced to the ocean before, and it can’t be fully known the long-term effects on the marine ecosystem. The group said that deep water fish, fish at the top of the food chain, mollusks, and other filtrating sea life are most sensitive to caesium contamination.
The IRNS will maintain to monitor marine life off of Fukushima’s coastal waters due to significant pollution of the nearby seawater that could persistently see more pollution as radioactively contaminated runoff rainwater will enter the ocean.
- France’s IRSN New Estimate on Amount of Cesium-137 into the Pacific Ocean: 27,100 Terabequerels, or 20 Times TEPCO’s Estimate (ex-skf.blogspot.com)
- *JUST IN* Top scientists refute Japan gov’t: “Copious quantities” of radioactivity leaked from Spent Fuel Pool No. 4 – A “significant part” of overall cesium release (enenews.com)
- Half of elementary and junior high school students in Minami-Soma who underwent radiation checks since late September were found with radioactive cesium-137 (enformable.com)
- Who Fears A Radioactive Graveyard If It’s In the Ocean? – Japanese Officials & Experts Late Decision to Expand Testing Around Fukushima Daiichi (enformable.com)
- Fukushima Prefecture Inhabited By New Long-Term Resident – High cesium levels detected in nearly half of Japans largest prefecture (enformable.com)