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Australia has issued an 
 over a missing radioactive capsule. State 
 in Western Australia warned residents of a "radioactive 
 risk" in regions including the state 
 Perth. The search is now on for the 8mm x 6mm capsule. It contains the 
 and radioactive substance Caesium-137. It has 
 of the radioactive material to "cause serious 
 consequences". The capsule went 
 while it was being transported from a mining town to a 
 of Perth. Officials think it fell through a 
 in the truck transporting it.