...By 27 January, search parties were in full force looking for the tiny capsule. But they were not scouting for it using their eyes - they were using portable radiation survey meters.
The survey meters are designed to detect radioactivity within a 20m radius.
"We are not trying to find the small capsule by eyesight. The radiation equipment will hopefully lead us to it," a police spokesperson said the following day.
Police focused their efforts on the GPS route the truck had taken, and on sites close to Perth's metropolitan and high-density areas.
One site along the Great Northern Highway was prioritised by police on 28 January after unusual activity on a Geiger counter - a device used for measuring radioactivity - was reported by a member of public.
But that search did not uncover the capsule.
The next day, additional resources requested from Australia's federal government had been approved and those overseeing the search began planning its next phase.
With the new equipment in Western Australia and ready for use by 30 January, the search ramped up.
An incident controller at the state's emergency services department, Darryl Ray, described the new tools provided by the government only as "specialised radiation detection equipment".
Local media reported that radiation portal monitors and a gamma-ray spectrometer were among the new items being used by search crews.
Radiation portal monitors detect gamma radiation and are typically used at airports to scan individuals to ensure they do not have radioactive substances on them. Gamma spectrometers measure the intensity of the radiation.
Mr Ray said the new detection equipment could be attached to vehicles so searches could be done from moving vehicles at about 50km/h.
"It will take approximately five days to travel the original route, an estimated 1400km, with crews travelling north and south along Great Northern Highway," he said.
But by the end of 31 January, the capsule continued to evade search crews.
"More than 660km has been searched so far - thank you to all agencies for their support," the Department of Fire and Emergency Services said....
The capsule was found.