PERTH, Australia (AP) — Authorities in Western Australia on Wednesday recovered a tiny but dangerous radioactive capsule that fell off a truck while being transported along a 1,400-kilometer (870-mile) Outback highway last month in what an official said was like finding the needle in the haystack.

Officials said the capsule the size of a pea was found south of the mining town of Newman on the Great Northern Highway. It was detected by a search vehicle travelling at 70 kilometers (43 miles) per hour when specialist equipment picked up radiation emitting from the capsule.

Portable search equipme...