Three workers at the stricken Fukushima nuclear plant in Japan have been taken to hospital after being exposed to high radiation.
The Fukushima Daiichi plant was badly damaged after a 9.0-magnitude earthquake triggered a tsunami that devastated the country's north-east coast on 11 March.
Engineers have been battling to cool the reactors and spent fuel ponds to avoid a large-scale release of radiation.
A spokesperson for the nuclear safety agency says workers at the site's No 3 reactor have been exposed to radiation ranging from 170 to 180 millisieverts in a turbine building, ABC reports.
An exposure of 100 millisieverts per year is considered the lowest level at which any increase in cancer risk is evident.
On Thursday emergency crews again aimed jets of water at one of the plant's reactors, a day after a plume of dark smoke forced workers to evacuate.
Fire crews are trying to top up a spent fuel unit in the reactor causing most concern.
White steam was seen rising from four of the six reactors earlier in the day.
Engineers have connected electricity to all the reactors and are running tests in a bid to restart the cooling systems soon.
