Members of the Incident Management Team coordinate the search for a radioactive capsule that was lost in transit by a contractor hired by Rio Tinto, at the Emergency Services Complex in Cockburn, Australia, in this undated handout photo. Department of Fire and Emergency Services/Handout via REUTERS
Australian authorities are mounting an extensive search for a tiny radioactive capsule believed to have fallen out of a road train - a truck with multiple trailers - that travelled 1,400 km (870 miles) in Western Australia. Here's what you need to know:
WHAT IS IT?
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