Radiation in Tokyo is the same level as "normal" since 16th March.
It went up much higher than usual still the level was max. 0.5 micro Sv/h.
(And it lasted only for a few hours.)
If one stands outside and is exposed to it (0.5 micro Sv) for a whole day (24h), one gets only 12 micro Sv of radiation.
I said "only" because if I get my chest x-rayed, I'll get 50 micro Sv.
In case of stomach, 600 micro Sv.
If I fly to New York from Tokyo, then fly back to Tokyo, I'll get 200 micro Sv.
Since 16th March up to now, the radiation in Tokyo is less than 0.1 micro Sv, which within the "normal" level in the past.
Today milk from Fukushima and spinach from
Ibaraki (both beyond 30km radius area) were tested and radioactive material above the safety standard was detected.
They immediately stopped at the farms, and farms were also advised not to consume the produce themselves.
Also it was decided that they'll screen more produce from these area.
Yet it was confirmed that it is the level that even if one consume them everyday for one year, it does not affect one's health.
That's said, people who are worried about it very much should get the iodine tablet "just in case", because constant worrying does affect one's mental health. If having some tablets ready makes one feel better, then he/she should get them - though one should be very careful about actually taking them.