Actually if you look at the static timeline, it does not line up exact. The Czech Republic has reported the measurable radioactive iodine since the end of October. That means it arrived there 11-14 days ago. Basically approximately 2 weeks. That really however does not matter due to the fact that we do not know when the high xenon levels began at Fukushima. The first daily measurement was undetectable with detection levels occurring on day two and three. There are however some complaints about TEPCO playing games with detection levels. This has been countered by TEPCO defenders claiming that the detection levels always vary based on each technique utilized to take such measurments.
That is all fine and dandy but TEPCO needs to always release the detection limits whenever they release measurements. Otherwise people might actually get an incorrect conclusion and we would never want that to happen. Right TEPCO ?
Later.
IAEA searching for source of mysterious iodine-131 radiation detected across Europe
Right now the source is approximated to be from southeast Europe. Apparently there are many possibilities.