An 8mm by 6mm silver capsule, no bigger than a dime, is believed to have been lost along the Great Desert Highway in Australia's largest state. Because of the capsule's small size and great distances, authorities warn that the chances of finding it are slim. "It's like looking for a needle in a haystack."
It is feared that it may have been transported away from the research area, creating a radioactive health hazard for anyone who encounters it for the next 300 years.

State authorities raised the alarm on Friday, warning residents of a radioactive spill in a southern area of the state, including the northeastern suburbs of Perth, the state capital, home to about 2 million people.
Mining company Rio Tinto apologized on Monday, saying it was supporting the state government's efforts to find the capsule, which contains Caesium-137, a highly radioactive substance used in mining equipment.
Rio Tinto said it had checked all routes in and out of the Gudai-Darri mine site in northern Western Australia, where the equipment was located before a contractor took it for the journey south to the state capital, Perth.
Authorities believe the capsule, which emits gamma and beta rays, fell from the back of a truck traveling along a 1,400 kilometer section of the Great Northern Freeway - a distance longer than the California coastline.
According to authorities, the capsule was placed inside a package on January 10 and collected from Rio Tinto's Gudai-Darri mine by a contractor on January 12.
The vehicle spent four days on the road and arrived in Perth on January 16, but was only unloaded for inspection on January 25, when it was discovered missing.
They believe the strong vibrations caused by the bumpy roads damaged the packaging, removing a mounting bolt that held it in place.
Experts have warned that Caesium-137 can create serious health problems for people who come into contact with it such as: skin burns from close exposure, radiation sickness and potentially deadly cancer risks, especially for those unknowingly exposed. long periods of time.
Taking the capsule would cause "serious damage" to your fingers and surrounding tissue, the company said in a statement, while the main concern is the potential health impact of the person who would find the capsule.
The incident is a shock to experts, who said the handling of radioactive materials such as Caesium-137 is highly regulated with strict protocols for their transport, storage and disposal.