If people want to learn more about Marine Debris from Japan, visit the following weblink where you can see what major ocean modelers are basing their predictions for debris land fall on - based on known debris (about 25 tons according to Japanese government estimates) combined with historical weather and ocean current patterns. Also learn about what Federal agencies including NOAA are doing and hear a podcast interview with one of NOAA's top marine debris specialists. As for chance of teh debris being radioactive - very little - the debris field was already at sea when the nuclear melt-down accident occurred. Check the Japan Tsunami Debris FAQs button on the right hand side of the above web link for more.
Johnnyguitar