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
One dead, six remain missing as police search for victims of fire in Old Montreal
One person has been confirmed dead and six people remain missing as police continue to search for victims after a fire swept through a building in Old Montreal on Thursday.

Woman suing Tim Hortons for $500K after hot tea spill left her 'disfigured'
An Ontario woman has launched a lawsuit seeking $500,000 from Tim Hortons after she suffered major burns from an alleged ‘superheated’ tea. The company has denied all allegations and said she was ‘the author of her own misfortune.'
5 Connecticut children dead after crash in New York
Five children from Connecticut, ranging in age from 8 to 17, were killed in a fiery early morning crash Sunday on a New York highway, police said.
Poilievre calling for national standardized test to license doctors, nurses trained outside of Canada
Conservative Leader Pierre Poilievre is calling for a national standardized testing process to be created in order to speed up the licensing process for doctors and nurses who are either immigrants or were trained abroad.
Trails of human bacteria from sneezing and coughing preserved on Mount Everest: study
Even at one of the tallest natural peaks on Earth, humans have left their mark in a trail of bacteria as researchers have found germs from coughing and sneezing that have been potentially preserved for centuries on Mount Everest.
Putin's world just got a lot smaller with the ICC's arrest warrant
President Vladimir Putin always relished his global outings, burnishing his image as one of the big guns running the world but with the International Criminal Court's war crimes charges against him, Putin's world just got smaller.
Possibility of Trump's arrest builds sympathy among his supporters
The possibility that Donald Trump may be charged for allegedly covering up hush money payments to a porn star during his 2016 campaign is garnering sympathy for the Republican former president, New Hampshire Governor Chris Sununu said on Sunday.
'Who, if not us, should stop them?': The stories of Ukrainian women on the front lines
A Ukrainian charity tells CTVNews.ca how women on the front lines of the war in Ukraine do not have proper equipment and are struggling with the realities of being in a conflict zone. Here are their stories.
North Korea: Latest missile simulated nuclear counterattack
North Korea said Monday it simulated a nuclear attack on South Korea with a ballistic missile launch over the weekend that was its fifth missile demonstration this month to protest the largest joint military exercises in years between the U.S. and South Korea.