The Tokyo Electric Power Co. says reactor No. 2 released the most radioactive materials following the disaster at the Fukushima No. 1 nuclear power plant. In its release, Tepco said 900 quadrillion becquerels of radioactive materials were released from three of the four reactors at the Fukushima power plant, The Asahi Shimbun reported. The amount of radioactive materials released as calculated by Tepco is 1.2 times the estimate of 770 quadrillion becquerels made last June by the Nuclear and Industrial Safety Agency. Tepco said most of radioactive materials, in the form of iodine and cesium, were released from the No. 2 reactor between March 12 and March 31, 2011. Reactor No. 2 released 360 quadrillion becquerels of radioactive materials, about 40 percent of radioactive material inside the reactor. The No. 1 reactor released 130 quadrillion becquerels of radioactive materials and No. 3 released 320 quadrillion becquerels. Tepco said it is unsure of the source of 110 quadrillion becquerels of radioactive materials, but it does not believe the No. 4 reactor building emitted radiation.