We've seen already a small UAV flying around the nuclear reactor and providing hires imagery. Would it be possible to use drones to measure radiation?
http://allegedlyapparent.wordpress.com/2011/04/13/build-your-own-rdiation-monitoring-drones/
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May be you could do it. You do not need to put the sensor open because the radiotion can easly pass through the objects around. In the incident at Fukushima they could even sense the radiation from 20 Km away from the source in ground level. If you use an UAV for the same purpase the range will be more.
https://www.youtube.com/watch?v=yp9iJ3pPuL8&feature=share