How did a radioactive capsule go missing in Australia and how dangerous is it?
Australian authorities are mounting an extensive search for a tiny radioactive capsule believed to have fallen out of a road train - a truck with multiple trailers - that travelled 1,400 km in Western Australia. Here's what you need to know:
WHAT IS IT?
The silver capsule is just 6 mm in diameter and 8 mm long and was part of a gauge used to measure the density of iron ore feed at Rio Tinto's RIO.AX remote Gudai-Darri mine.
HOW DID IT GO MISSING?
The gauge, packaged by a specialist contractor, was picked up from the mine on Jan. 12, by a separate logistics company. When it was unpacked on Jan. 25, it was found broken apart, with one of its four mounting bolts as well as screws and the capsule missing.
Authorities suspect vibrations from the road train caused the gauge to break apart and the capsule fell out.
HOW DANGEROUS IS THE CAPSULE?
Filled with Caesium-137, it emits radiation equal to 10 X-rays an hour. Authorities have issued a radiation alert for large parts of Western Australia and if it is spotted, recommend that people stay at least five metres (16.5 feet) away as exposure could cause radiation burns or sickness.
But just driving past it is believed to be of relatively low risk.
WHAT DOES THE SEARCH INVOLVE?
The road train travelled from the mine in the state's remote Kimberley region and arrived at a storage facility in the suburbs of Perth on Jan. 16.
Search crews are traveling north and south along the state's Great Northern Highway as well as other sections of the road train's journey with specialized radiation detection equipment. The Department of Fire and Emergency Services said on Monday it will take five days to cover the road train's route. It said on Tuesday that more than 660 km had been searched so far.
The search involves at least five other government agencies including the Department of Defence, the police, the Australian Nuclear and Science Technology Organisation and the Australian Radiation Protection and Nuclear Safety Agency.
(Reporting by Melanie Burton and Lewis Jackson; Editing by Edwina Gibbs)
CTVNews.ca Top Stories
Opposition parties affirm call for interference inquiry, amid questions over MP Han Dong
Amid renewed questions over the pervasiveness of alleged interference by China in Canadian elections and affairs broadly, opposition MPs voted Thursday afternoon to affirm a parliamentary committee's call for the federal government to strike a public inquiry.

'Scream as loud as you can': 5 boys rescued from NYC tunnel
Five mischievous boys had to be rescued after they crawled through a storm drain tunnel in New York City and got lost, authorities said.
Asteroid to hurtle past Earth closer than the moon this weekend
An asteroid discovered just last week will pass closer to the Earth than the orbit of the moon this weekend, an occurrence so rare it happens only once in a decade, according to NASA.
Number of Canadians receiving EI at record lows, down 44 per cent from last year: StatCan
The number of Canadians receiving employment insurance benefits are at record lows and down 44 per cent from last year, new figures from Statistics Canada show.
Indigenous sisters developing video games to revitalize Mohawk language
Two Kanien'keha:ka (Mohawk) sisters from Montreal are on a mission that is close to their hearts: to save their ancestors' first language by developing video games young and old can play.
Here are the locations of the first 12 new Zellers stores
Zellers has opened the first of 25 new locations within Hudson's Bay stores across the country. The Canadian retail chain launched 12 stores in Ontario and Alberta Thursday, along with a new e-commerce website.
South Carolina's top accountant to resign after US$3.5-billion error
Embattled South Carolina Comptroller General Richard Eckstrom will resign next month after a US$3.5 billion accounting error in the year-end financial report he oversaw.
Via Rail revisiting inclusion policies after Muslim man told not to pray at Ottawa station
Via Rail says it is working to improve its diversity and inclusion policies after a Muslim man was told not to pray at the Ottawa train station.
RCMP arrest suspect in Montreal on terrorism allegations after tip from FBI
The Royal Canadian Mounted Police (RCMP) arrested an 18-year-old man from the Saint-Laurent borough of Montreal on Thursday morning in connection with allegations of terrorism.