When you breath, do you use an oxygen/breathing mask, or do you just fill your lungs with unfiltered air from the atmosphere? If not, please, don't care about radiation that so far not any experts (you that the IAEA has lots of experts on that case, even some from the US) is concerned about. (atleast as far as i seen documents about it) And believe the jJapanese, they are quite good with radiation by now, that live testing area they had for the last 70 years helped lots.
Oh btw. I was born before Chernobyl, still alive!