◆ Office of the prime minister of Japan
　(http://www.kantei.go.jp/foreign/index-e.html)
◆ Ministry of Economy, Trade and Industry
　(http://www.meti.go.jp/english/index.html)
◆ Nuclear and Industrial Safety Agency Emergency information page
　(http://kinkyu.nisa.go.jp/) (Japanese only)
◆ Ministry of Education, Culture, Sports, Science and Technology
　(http://www.mext.go.jp/english/)
◆ Ministry of Land, Infrastructure, Transport and Tourism
　(http://www.mlit.go.jp/page/kanbo01_hy_001411.html)
◆ Ministry of Internal Affairs and Communications
　(http://www.soumu.go.jp/menu_kyotsuu/important/kinkyu01_000096.html) (Japanese only)
◆ Ministry of Health, Labour and Welfare
　(http://www.mhlw.go.jp/stf/houdou/2r98520000014j15.html) (Japanese only)

◆ Ministry of Education, Culture, Sports, Science and Technology
　・ Reading of environmental radioactivity level by prefecture
　　（http://www.mext.go.jp/english/radioactivity_level/detail/1303986.htm）
　・（http://www.mext.go.jp/english/radioactivity_level/detail/1303962.htm) Reading of radiation dose rate in air in the vicinity of Fukushima nuclear power plant by monitoring vehicle
◆ Relevant regional authorities
　・Tokyo (http://ftp.jaist.ac.jp/pub/emergency/monitoring.tokyo-eiken.go.jp/monitoring/index-e.html)
　・Ibaraki (http://www.pref.ibaraki.jp/bukyoku/seikan/kokuko/en/)
◆ Atomic Energy Society of Japan
　(http://www.aesj.or.jp/index-e.html)
◆ National Institute of Radiological Sciences
　(http://www.nirs.go.jp/ENG/index.html)
◆ Japan Atomic Energy Agency
　(http://www.jaea.go.jp/english/index.shtml)
◆ KEK/High Energy Accelerator Research Organization
　(http://www.kek.jp/quake/en/index.html)
◆ National Institute of Advanced Industrial Science and Technology
　(http://www.aist.go.jp/aist_e/taisaku/index.html)
◆ RIKEN
　(http://www.riken.go.jp/engn/r-world/topics/110314/monitoring.html)
◆ University of Tokyo Hospital Radiology Division
　(http://www.u-tokyo-rad.jp/data/toudaienglishvol3.pdf)