What a bullshit. Please provide an official source for this claims.
Mushrooms in the Central Europe were contaminated, but only for a first few months after the disaster.
It is Ceseium-137 which still contaminates mushrooms and all animals regularly eating those. Occasional consumption is possible but not recommended. And that is 30 years after Chernobyl.
I remember one particularly scary item: Wild mushrooms from Eastern Europe, e.g. Poland.
Only, you didn't have to go that far to have real risk. At that time, some measurements had mushrooms concentrating relevant radioactive isotopes by circa 400 times, IIRC.
Weather patterns and geography created particular hot spots in the more immediate area. For some reason, the Tirol sticks in my mind, for one.
and this: http://qz.com/258731/radioactive-wild-boars-still-run-wild-i...
Both say the contamination comes from mushrooms.
As a physicist, I am certainly not afraid of "nuclear" and "radiation" in the abstract. But seeing the country you live in to be contaminated for so long just because a single operator error is quite sobering. Solar has its challenges on the technical level, as the power output depends on the daytime and weather, but that is not killing anyone. "And who say that batteries can't explode?" - well even if they would, you would have a ruined battery, perhaps a building. That can be rebuild. The damage done by Chernobyl cannot be fixed for centuries.
The good news in all of this is: by now solar has become cheaper than building new, safe and modern nuclear reactors. And as a lot of the grid load in California comes from air conditioning, I fail to see how solar would not be the perfect solution for these kind of loads.