Plus Tokyo's only 149 miles from Fukushima.
Nothing to worry about with that....
Erm you do know that Tokyo has recorded levels of Radiation lower than that of New York, Paris, Berlin, London, Singapore, Beijing and Seoul to name a few?....
That said, I'd watch where your food and water are coming from - although if you're only in Tokyo for 2 weeks I find it highly unlikely you'd take in enough radiation through low level radioactive food to cause any serious long term impacts.