The device is part of a density gauge, which is common in the mining industry. It was being used at Rio Tinto's Gudai-Darri mine in the remote Kimberley region.The gauge was being transported by a subcontracted company, which picked it up from the mine site on 12 January to move it to a storage facility in the north-east suburbs of Perth.When it was unpacked for inspection on 25 January the gauge was found broken apart and the radioactive capsule was gone. One of four mounting bolts and screws were also missing.Authorities said vibrations during transit may have caused the bolts to become loose, allowing the capsule to fall through gaps in the casing and truck.

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