I was imaginging insane nuclear laser drills, but...
> The capsule, part of a gauge used to measure the density of iron ore...
https://www.aljazeera.com/news/2023/1/31/australian-nuclear-...
More info:
https://en.wikipedia.org/wiki/Western_Australian_radioactive...
Terrifying Wikipedia rabbit hole:
https://en.wikipedia.org/wiki/List_of_orphan_source_incident...