No :( Radiation poisoning is serious, and its effects are life long. if anything was wrong with him though, we'd know about it. and so far he seems perfectly fine so its safe to assume he wasn't affected :) and if we was, probably not too much...
Oh guys! No problem! I have a relation, who works with atom( atomphisics etc...) and he said me chernobil was very dangerous, but if somebody now ok we can be sure that he/ she doesn't ill.