Tepco uses the RISER quadcopter drone to visually map gamma radiation in the unit 3 turbine building. The RISER quadcopter drone is equipped with GPS, HD cameras and the N-Visage 3D gamma radiation detector which produces color images of radiation. It has a small size 3d gamma camera.
The N-Visage 3D gamma radiation detector technology has been used previously to examine the refueling floor of unit 2 and some other areas of the reactor buildings.
The RISER quadcopter drone has a maximum radiation resistance of 10 mSv/hr so it won’t be used into the more dangerous areas of the site.