Following up this article ..Tokyo is contaminated as the worst place in Chernobyl
On 2/21~23/2012, a Twitter user measured radiation level at Tokyo station and it turned out to be 2.94~6.5 microSv/h.(Only gamma ray)
↓ Aisle from Yaesuguchi underground parking lot to underground mall of Tokyo Station
↓On the platform of Tokaido Shinkansen
The picture above is one of the 6 measurements.
The results are like this below
1m height from the ground : 6.5~4.8 microSv/h
1.8m height from the ground : 3.0~4.2 microSv/h
6.5 microSv/h is converted to 57 mSv/y.
It’s higher than 50 mSv/y in mandatory evacuating zone in Fukushima.
The reason of this high level of contamination is assumed to be because hot particles are brought from Fukushima or North Japan by the shoes of passengers.