In 2001, three woodcutters in Lia, Georgia, found two hot metal objects in the forest & used them for warmth during the night.

The objects turned out to be recklessly discarded 250W radioisotope thermoelectric generators from an old dam construction project.

Orphan sources are a lot commoner than you might suppose. By 2006, as many as 300 orphan sources had been discovered in Georgia alone.