Radiation was also detected on a Japanese merchant vessel that berthed in the southeastern Chinese port city of Xiamen on Monday, the Chinese watchdog said.
The list of contaminated foodstuffs grew Friday when the health ministry said radiation above the legal limit had been detected in Japanese mustard spinach grown in Tokyo.
At the Fukushima plant, workers kept spraying seawater onto overheating reactors and fuel rod pools as a stop-gap measure to prevent a larger meltdown, while trying to restore the original cooling systems.
The pair hospitalized Thursday were installing cables in the basement of the third reactor's turbine building when they stepped into water containing iodine, caesium and cobalt 10,000 times the normal level, TEPCO said.
The men, aged in their 20s and 30s, were wearing radiation suits but had on ill-fitting shoes, and they had ignored a warning alarm from their dosimeters, "assuming a problem with the device", a TEPCO official said.
A total of 17 workers have been exposed to more than 100 millisieverts, the level at which the risk of developing cancer rises, the company says.