TOKYO: Two workers from Japan’s stricken Fukushima nuclear plant have been contaminated by high levels of radioactive iodine, the operator said Monday, prompting fears over their long-term health.

The workers, reportedly men in their 30s and 40s, may have already been exposed to radiation levels higher than the recently boosted official annual limit, Japanese media suggested.

Tokyo Electric Power Company (TEPCO) said it had been measuring the internal exposure to radiation of all employees involved in emergency work at the Fukushima Daiichi plant crippled by the March 11 earthquake and tsunami.