Probe into Dounreay contamination scare
The alert was sounded at the site as some 14 workers were preparing to leave a building in the complex, which has been scheduled for demolition.
The area around the building was sealed off after the alert on Wednesday night.
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Hide AdFurther checks confirmed the contamination had been confined to a small area within the nuclear plant.
A spokeswoman for Dounreay Site Restoration said: “Traces of contamination were found on the shoes of a number of operators who were preparing a building for demolition.
“The contamination was detected when the operators prepared to leave the building.”