PV aren't just sand, if they were my windows would be PV. Small impurities matter over long times and large quantities.
Also wrong on long term plan for nuclear. Long term plan is wait. Radioactivity reduces itself with time.
Yes, we need to recycle the materials. Landfill is not a viable solution for any waste, none of that is unique to solar power.
> Long term plan is wait
Waiting a lifetime is easy. Waiting hundreds of generations after we’re dead is not. Is that an argument against nuclear power? Not in my opinion. There’s still no finalized plan describing how waiting will work in practice though.
90% of nuclear waste is harmless within a year or two. The rest is so dense, that it fits a couple of trucks, and can be stored indefinitely long in a very small storage
Voila what? If you're concerned about people degrading so far down that whatever we leave behind is "tombs of the third millenium", then storing a truckload of nuclear waste isn't really an issue.