Japan : Radiation level unchanged despite choppers dousing reactor

And another also from Kyodo News, note the last paragraph in bold :

" The radiation level remained unchanged at the troubled Fukushima No. 1 nuclear plant Thursday morning even after Self-Defense Force helicopters dropped tons of water onto the hardest-hit reactor there, Tokyo Electric Power Co. said.

Two copters dumped seawater onto the No. 3 reactor four times shortly before 10 a.m., but the radiation level was unchanged past 10 a.m., the utility said.

The level around the plant's quake-proof building at which workers are standing by has risen to about 3,000 microsievert per hour, it said. The level compares to 1,000 microsievert, or 1 millisievert, to which people can be safely exposed in one year."