Authorities believe it fell through a hole where a bolt had been dislodged after a container collapsed inside the truck.
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.
“Typically they’re transported in highly protected casing that are subject to a certification verification stage. The housing is subjected to rigorous testing for vibrations, heat, high impact.
“If the source is certified and the packaging and the transport requirements … basically make it a very unlikely occurrence.”
So, I think there's some berkeleyery afoot here. I've worked with the type of packaging standards and tests that she's talking about in the news article. In the US the standard is Performance Oriented Packaging, or P.O.P. testing. Europe has a similar standard, I would bet whatever money you want to name that Australia has a similar standard with similar rules.
Basically the standard tests that when dropped, vibrated, or otherwise manhandled or damaged the packaging can withstand the possible damage without allowing the potentially hazardous material within to escape. More hazardous, the more stringent the packaging. There are standards for everything from laundry detergent up to explosive material (which is where I learned about it.) These tests are pretty rigorous, and depending on what the actual material is that's being transported you can get a pretty hefty fine if everything isn't hunky dory.
So, with all of that in mind, all I have to say about this is: This capsule wasn't packaged properly, or someone removed it. For something to escape one of these packages you have to open it up, cut it apart, or do some other such thing to get it out. Someone did this. Either they berkeleyed up the packaging portion of it, or took it out.
No one is going to find this on the walk of shame pictured above.