The Report which Tepco made for press conference on 6/6/2011 was updated on the internet.
According to the report, Tepco already announced that Plutonium 238, 239, 240, 241 was released to the air in the first 100 hours after the earthquake.
It reads the amount is 1.2 Trillion Becquerels.
When it comes to Np-239, it is 76 trillion Becquerels.
It is possible to assume a certain amount of them have flown to around Tokyo.
Knowing the fact, Media kept quiet about the risk for 7 months and kept people exposed.