Australian authorities on Wednesday found a radioactive capsule smaller than a coin that was lost in the vast Outback after nearly a week-long search involving around 100 people along a 1,400 kilometres (870 miles) stretch of highway, officials said.

The Caesium-137 capsule lost in transit more than two weeks ago was discovered when a vehicle travelling at 70 kms per hour equipped with specialist detection equipment picked up the radiation, according to officials from the state of Western Australia.