This is really weird. FTA: "These gauges are designed to be robust and to be used in industrial settings where they may be exposed to weather and vibration,” Dr. Robertson said at a news conference on Saturday, “so it is unusual for a gauge to come apart like this one has."

See also this [1] article with a picture of an example gauge. Again making the point that this is really weird: "Radiation Services WA general manager Lauren Steen said it was a “highly unlikely” scenario, due to the safety measures typically in place for the transit of radioactive materials."

New material for a future Plainly Difficult episode once the investigation is complete.

[1] https://www.abc.net.au/news/2023-01-28/radioactive-capsule-s...