Over ten thousand years, erosion or earthquakes can expose the entrance, contaminating the site. People could dig a well or prospect for minerals. The suggestion of underground activity could suggest to them that it is a good place to mine, or even that there’s a tomb or other interesting artifacts
Any civilization advanced enough to dig deep enough will quickly understand that the material is dangerous.
Well look, there’s only really one civilisation we can look at to see if this is true, and that’s our current civilisation. It turns out, though, that this civilisation learned to dig through clay and boulders to any depth a few centuries before it understood what radioactive nuclei do to the human body. It’s fair to say a new civilisation would probably learn quickly why all of the people mining near the glowing rocks were dying in pain, but progress in that area would probably be measurable in agonising deaths, which is presumably what people are happy to spend money on these signs to avoid.
These are a waste of money.
Dig a deep hole into the bedrock, put waste into the hole, backfill with clay and boulders.
Any civilization advanced enough to dig deep enough will quickly understand that the material is dangerous.
And if for some reason a primitive civilization does manage to get at the material they will notice that the material is harmful and avoid it.
Over ten thousand years, erosion or earthquakes can expose the entrance, contaminating the site. People could dig a well or prospect for minerals. The suggestion of underground activity could suggest to them that it is a good place to mine, or even that there’s a tomb or other interesting artifacts
Well look, there’s only really one civilisation we can look at to see if this is true, and that’s our current civilisation. It turns out, though, that this civilisation learned to dig through clay and boulders to any depth a few centuries before it understood what radioactive nuclei do to the human body. It’s fair to say a new civilisation would probably learn quickly why all of the people mining near the glowing rocks were dying in pain, but progress in that area would probably be measurable in agonising deaths, which is presumably what people are happy to spend money on these signs to avoid.