[en] The massive tsunami hit the Fukushima-Daiichi nuclear power plant after the Tohoku earthquake on March 11^th, 2011. Emergency electric systems of diesel electric machines stopped and during several days later the hydrogen exploded due to over-heated reactors at units 1, 3 and 4. In addition, serious damage was caused in a fuel nuclear storage of unit 2. As a result of these accidents, an extremely large amount of radioisotopes were spread in air, soil, tap water, seawater and food around large areas in East Japan.First, this presentation reports about radiation measurements with the silicon detector Liulin at the J-village, a base of emergency workers, located 20 km from Fukushima Daiichi from March 23^rd, 2011 to August 5^th, 2011. Comparison of measurements with the same device at some other locations (Chiba city, Moscow, board of aircraft) before and after the accident will be presented. Second, the presentation describes our efforts to develop a new portable gamma camera based on Medipix to locate radiation hotspots at Fukushima prefecture. (authors)