How did a radioactive capsule go missing in Australia and how dangerous is it?
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:
The silver capsule is just 6 mm in diameter and 8 mm long and was part of a gauge used to measure the density of iron ore feed at Rio Tinto's (RIO.AX) remote Gudai-Darri mine.
The gauge, packaged by a specialist contractor, was picked up from the mine on...