They aren't the only ones. Quite a few nuclear sources have been lost.
The Soviet Union used radiodecay thermoelectric generators with breathtaking liberalness. Radio relay links, lighthouses, nav beacons, remote weather sensors. Approximately a thousand nuclear batteries were made and deployed. The budget for their maintenance fell with the USSR. While a lot of them have been collected, there's still hundreds still out there.
In 2001 a group of men in rural Georgia [0] stumbled across one; unaware of the nature of what they found, they took benefit from the warmth of it on a cold night. Three were sickened and one died of radiation poisoning.
The Soviet Union used radiodecay thermoelectric generators with breathtaking liberalness. Radio relay links, lighthouses, nav beacons, remote weather sensors. Approximately a thousand nuclear batteries were made and deployed. The budget for their maintenance fell with the USSR. While a lot of them have been collected, there's still hundreds still out there.
In 2001 a group of men in rural Georgia [0] stumbled across one; unaware of the nature of what they found, they took benefit from the warmth of it on a cold night. Three were sickened and one died of radiation poisoning.
[0] https://en.wikipedia.org/wiki/Lia_radiological_accident