This is the best tl;dr I could make, original reduced by 85%. (I'm a bot)

> Mining giant Rio Tinto has apologised as the search continues for a tiny radioactive capsule that went missing while it was being taken to a storage facility in Perth, triggering a radiation alert in parts of Western Australia.

> The capsule left the site on January 12, and the contractor hired by Rio Tinto told the company it was missing on January 25.

> Before the device left the site, a Geiger counter was used to confirm the presence of the capsule inside the package, Rio Tinto said.

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