Mining giant Rio Tinto has apologised for losing a tiny radioactive capsule that went missing as it was being transported across Western Australia. An emergency hunt for the device, which is about the size of a pea, is under way along the 1,400km (870 mile) route.
The capsule contains a small quantity of radioactive Caesium-137, which could cause serious illness to anyone who comes into contact with it. That could include skin damage, burns or radiation sickness.