What did you want to know about what I know of Fukushima? That an incident occurred or something more specific? I actually know a fair bit about the technology and I have extensive training as well as experience in the field.
Now we are talking. Decomissioning a reactor in a "critical" state got me. Those Fukushima exploding roofs had been subcritical state.
Xenon-135 or Krypton-85 measurements are missing, those would hint onto a common reactor (used for energy generation) having produced the fallout.
Iodine-127 is stable (anisotop even), Iodine-131 lasts 8.02070 days (ß- decay, not a blockchain halving) so the incident could be precisely timed IF the sensor's minimal detectable amount is known. Iodine spreads easily, the others might have been detectable but knowledge about not been voiced out.
Until the other common isotopes popup I am leaning onto the assumption that a source of medical origins unlike the Goiânia accident or this crap
http://iaea.org/newscenter/news/2013/mexicoradsource.html happened.
My level of interest equals that of an affected hobbyist. Would not call myself tech weary, everybody of us has some decent daily use of so many techy things we can hardly understand or built ourselfes. Nuclear power plants beeing amongst those, but I would hardly even vote for building such things anymore. This technology getting dumped by electric power industry by now merely because of production/maintenance costs.
Russia is perhaps the country which is operating the maximum number of nuclear power plants in the world. Still, when was the last time you heard about an accident occurring in any of their reactors? And remember that Chernobyl was in Ukraine, and not in Russia.
The US has multiple times the number of nuclear reactors that Russia has. France also has more reactors that Russia. I believe Japan has more as well - though Japan has had a level 7 event as well but that could be considered an act of God. The reactor at Chernobyl was russian designed rbmk-1000 and Ukraine was under the direct control of Moscow ergo Russian.
The japanese imported Westinghouse powerplant designs but the bigger vessels had been Toshiba as source of origins. The scene is spread internationally, not so easy to say those or them doing maintenance work at the plant. Inside some silly heads whole of russia is glowing red from radiation, but quite the opposite is true. When someone is currently (l)using control over this technology it's more likely us.