Considering the decay activity of I-131 from March 11, that leaves about 7500 tera Bq of activity that is still out there either wafting around in the atmosphere or settling into the ecosystems. That is 7.5 quadrillion Becquerel."Tokyo Electric Power Company estimates that about one percent of the radioactive iodine at the Fukushima Daiichi nuclear power plant has been released since the March 11th earthquake and tsunami damaged the facility.
The company on Tuesday announced the estimated radioactivity levels of all substances at the plant's 6 reactors and fuel storage pools at the time of the disaster.
The estimates are classified under radioactive noble gases, iodine or other materials.
81 million tera-becquerels of iodine-131 are believed to have existed at the plant.
The utility says the amount of iodine-131 released outside the plant is about one percent of the total with a margin of error included.
The Nuclear and Industrial Safety Agency said earlier in the day that 130,000 tera-becquerels of iodine-131 have been released so far."