In order to protect diffusion of radioactive materials around the
buildings of Unit 1-4 of Fukushima Daiichi Nuclear Power Station, we have
implemented a full-scale spray of dust inhibitor using a crawler dump
since April 26. Since May 27, we will start spray of dust inhibitor to the
turbine buildings and reactor buildings of Unit 1-4 using a water spray
vehicle with bending arm and concrete pumping vehicle. 

To effectively spray dust inhibitor to the turbine buildings and reactor
buildings, a water spray vehicle with bending arm and concrete pumping
vehicle are used in accordance with the conditions of buildings and site.
The water spray vehicle with bending arm can be utilized with the full
support of the Tokyo Fire Department.  

Reference: Schedule of Spray of Dust Inhibitor(Image) 
           -Around the Buildings-(PDF 368KB)