Traces of radiation found on Dounreay workers' shoes
Traces of radioactive contamination have been detected on shoes worn by workers preparing to leave a condemned building at the Dounreay nuclear site.
It was understood 14 workers were involved.
They had been working in a building on the Caithness site which is due to be demolished and where there was a known possibility of contamination.
Dounreay Site Restoration Limited said the workers and environment outside the building had not been harmed.
Regulators the Office of Nuclear Regulation (ONR) and Scottish Environment Protection Agency (Sepa) have been informed.
DSRL said: "The building is in a 'controlled' area, where contamination is possible, and controls are in place to manage it.
"The area was isolated and follow-up surveys confirmed that the contamination was confined to a small area. An investigation is under way.
"There was no harm to staff or the environment."