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They call them “orphan sources,” like when a tiny radioactive capsule smaller than a 10-cent piece goes missing in remote Western Australia.

Western australiaTony irwinAndrew robertsonPradip debAustralian national universityAustralian nuclear scienceRio tintoNuclear safety agencyTechnology organisationCurtin university associate professor nigel marksHealth officer andrew robertsonAssociate professor nigel marksMonday rio tintoAustralian radiation protectionSafe transportRadioactive material