What people often don't understand about radioactivity, is that if you have short halflife, like weeks, the radiation is dangerous but doesn't last long. And if you have huge half life, like a million years, then radiation is basically non-existent and not dangerous at all.

This lack of understanding is why people spread FUD about radioactive waste that will poison the planet for million years.

You mean like all the radioactive coal smog?

No, seriously, coal burning released more radiation into the environment than actual nuclear waste. Long-term storage is a problem but it's still a better problem to have to solve than fossil fuel pollution.

It's dangerous for around 10 thousand years, not millions of years.

And we know of places that are stable on a geological time scale (which is in fact million of years).