As authorities scour the desert for the missing source, here’s what we know about how it works and what threat it poses to humans
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Authorities are continuing the search for a tiny radioactive capsule lost along a 1,400km stretch of Western Australian desert highway.
The 8mm by 6mm capsule fell from a secure device on a truck that was travelling from a Rio Tinto mine site, north of Newman in the Pilbara region, to Perth, where it was being sent for repair.
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