>>2292645It's typically when scrap metal dealers remove the core from the shielding.
The shielding is obviously lead and thus very valuable, often shielding is taken and the core simply left.
What the core IS is far harder for a scrap metal dealers to work out- if it were steel it would be relatively worthless.
If they knew what it was they wouldn't remove the shielding.
A poor farmer tried to use the core to head his house- not questioning why this large piece of metal perpetually gave off heat. GOD rent his soul.