A tiny radioactive capsule is lost on a highway in Western Australia. Here's what you need to know

By Edward Obbard, Senior Lecturer in Nuclear Engineering, UNSW Sydney

On January 12 a truck pulled out of Rio Tinto’s Gudai-Darri iron ore mine in the Pilbara region of Western Australia and drove 1,400km south to Perth, arriving on January 16.

Nine days later, on January 25, it was discovered the truck had lost a rather special piece of cargo somewhere along the way: a tiny capsule containing a highly radioactive substance, used in a radiation gauge on the mine site.

A bolt and screws in the package were also missing, and authorities…

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