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Australian nuclear body joins search for missing radioactive capsule

MELBOURNE — Australia’s nuclear safety agency said on Tuesday it had joined the hunt for a tiny radioactive capsule missing somewhere in the outback, sending a team with specialized car-mounted and portable detection equipment. 

Authorities have now been on a week-long search for the capsule which is believed to have fallen from a truck that had traveled some 1,400 kilometers (870 miles) in Western Australia. The loss triggered a radiation alert for large parts of the vast state. 

The capsule, part of a gauge used to measure the density of iron ore feed, had been entrusted by Rio Tinto Ltd to a specialist contractor to transport. Rio apologized on Monday for the loss, which happened sometime in the past two weeks. 

The Australian Radiation Protection and Nuclear Safety Agency said it was working with the Western Australian government to locate the capsule. It added that the Australian Nuclear Science and Technology Organisation has also sent radiation services specialists as well as detection and imaging equipment. 

The truck traveled from north of Newman, a small town in the remote Kimberley region, to a storage facility in the northeast suburbs of Perth — a distance longer than the length of Great Britain. 

State emergency officials on Tuesday issued a fresh alert to motorists along Australia’s longest highway to take care when approaching the search parties, as vehicles carrying the radiation detectors are traveling at slow speeds. 

“It will take approximately five days to travel the original route, an estimated 1400kms, with crews travelling north and south along Great Northern Highway,” Department of Fire and Emergency Services Incident Controller Darryl Ray said in a statement late on Monday. 

The gauge was picked up from Rio Tinto’s Gudai-Darri mine site on Jan. 12. When it was unpacked for inspection on Jan. 25, the gauge was found broken apart, with one of four mounting bolts missing and screws from the gauge also gone. 

Authorities suspect vibrations from the truck caused the screws and the bolt to come loose, and the capsule fell out of the package and then out of a gap in the truck. 

The silver capsule, 6 millimeters (mm) in diameter and 8 mm long, contains Cesium-137 which emits radiation equal to 10 X-rays per hour. 

People have been told to stay at least five meters (16.5 feet) away as exposure could cause radiation burns or radiation sickness, though experts have said driving past the capsule would be relatively low risk, akin to taking an X-ray. — Reuters

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