Ten workers at the crippled Fukushima nuclear power plant in Japan were exposed to radiation from contaminated mist Monday, TEPCO says.

RT reports that exposure levels detected by radiation monitors worn by workers were found to be as much as 10 becquerels per square centimeter - 2.5 higher than the safe radiation exposure level - said Tokyo Electric Power Company (TEPCO), the plant's operator responsible for decommissioning.

The mist is used to cool temperatures near a quake-proof building, TEPCO said, according to Bloomberg.

The radiation was found on workers' faces and hair, The Christian Science Monitor reports. The workers were conducting cleanup activities and were waiting for a bus when they were sprayed.

It was unknown how the mist became contaminated, Tepco said in an e-mailed statement, Bloomberg reports.

The mist was turned off and workers at the building were prohibited from using tap water, which comes from the same source as the mist, located 10 km from the facility.

Earlier Monday, an alarm went off indicating a high radiation dose was detected at the continuous dust monitor installed in front of the main building, TEPCO said.

The workers were instructed to put on full-face masks in areas where the masks were previously not required, RT reports. TEPCO added that no impact has been detected outside of the power station.

This is the latest crisis following a powerful earthquake and tsunami in March 2011, which destroyed power and cooling systems at the plant and released large amounts of radiation. Makeshift equipment is being used to cool the reactors, and the plant has been plagued by blackouts and leaks of contaminated water, The Christian Science Monitor reports.