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Unfortunately, there’s no obvious solution for the problem at hand...

How about seeding the area with radiation-eating fungi, would that help?

That just redistributes the radiation into the fungi. Then what do you do?

find an animal to eat the fungi, then collect all the dead fungi predators, and place them deep in a mountain where we put nuclear waste?

The huge majority of any fungi tends to be in the ground or within it's host.

Plus the entire problem is quite likely that the wood/leaf eating fungi are radiation sensitive, so...