its your fault you live 2 hours away fromt he airport, not theirs, so this shouldn't form any basis of being unable to work. If people are exposed to radiation at the airport i find that really worrying! WHAT ABOUT GROUND STAFF WHO WORK THERE EVERYDAY OF THEIR WORKING LIFE?
Anyway, it sounds like your employers have made reasonable adjustments to your job for you, and you can garuntee they have been in this situation befoore even if you haven't, so why has this "unable to work as ground staff" never come up before i wonder?