Fission Reactors on the Earth
- Discusses the natural nuclear fission reactions that occurred 1.7 billion years ago in uranium deposits at Oklo, Gabon.
- http://www.npp.hu/tortenelem/foldreaktor-e.htm

Radnet
- Information about past releases and dispersion of radionuclides in the biosphere.
- http://www.davistownmuseum.org/cbm/

Radiation Physics and Radiocarbon Research Lab
- Measurement of man-made and natural radionuclides in the environment. Radiochemical lab including radiocarbon dating service from the University College Dublin.
- http://www.ucd.ie/radphys/

Radiocarbon and Low-Level Counting Section Tbilisi State University
- Supports radiational ecology and health physics development in Georgia. Studies of radionuclides in Southern Caucasian environment and technogenic radiational background. Provides information and resources.
- http://radioecology.myweb.ge/

Swedish University of Agricultural Sciences Radioecology
- Provides information on research and studies.
- http://www.mv.slu.se/ma/radio/radio-e.htm

Centre for Ecology and Hydrology Radioecology
- Cthe CEH at Merlewood in the UK study the movement and distribution of man-made radionuclides in the environment. Provides description of projects and laboratory services.
- http://merlewood.ceh.ac.uk/Sections/radio/labs.htm

Journal of Environmental Radioactivity
- Publication of original research or review papers on any aspect of the occurrence of radioactivity in natural systems. Science Direct Elsevier Science on line journal.
- http://www.sciencedirect.com/science?_ob=JournalURL&_cdi=5914&_version=1&_urlVersion=0&_userid=0&md5=55a45f26d8ab0c3c4e77e743a2ee619b

International Union of Radioecology
- Professional association of radioecologists and scientists in related fields. Information about the organization, upcoming meetings, online issues papers and other publications, and links to other websites related to environmental radiation protection.
- http://www.iur-uir.org

Laboratory for Radioecology, Nakaminato, Japan
- Studies environmental behavior of radionuclides and effects of radioactivity on marine organisms.
- http://www.nirs.go.jp/ENG/nakami.htm