We need to watch the radiation levels coming from Japan. The radiation will follow the jet stream and if it's high enough it will cover half the Western U.S. 100- 200 rad causes death in 5-6 weeks and it goes up from there. Get supplies-- it takes about 2 weeks for the radiation fallout to dissipate it would only be safe inside and sealed for 2 weeks! Then I'm not sure when we could garden again. Be Prepared-- maybe it won't be that high-- let's watch it!
There's a chart at the bottom of this page of what happens at different radiation levels:
http://www.hss.energy.gov/HealthSafety/ohre/roadmap/achre/chap8_2.html
Here's a map of a possible scenario of radiation following the jet stream: