Given the increases of human suffering and genetic mutation encountered thus far - it’s crushing to think of that 200 year half life - or the thousands of years that Plutonium lasts.
There’s actually evidence that recriticality is still occurring in at least one of the reactors and this is believed to explain why some areas in japan have increased levels of radiation in September compared with readings taking in June. It’s not over yet.
They have a serious problem in Reactor 1. A pipe that normally contains cooling water, was 60 % filled with Hydrogen gas. They pumped Nitrogen Gas into the pipe and removed the Hydrogen, but the Hydrogen reentered the sealed water pipe again. So some where there is Hydrogen gas being created with pressure enough to possibly break the water pipe seals. They do not know where the Hydrogen gas is coming from.