Click on the links to access the sites:
Professional societies
Society of Toxicology (SOT)
Americal Society for Cancer Research (AACR)
American Chemical Society (ACS)
American Public Health Association (APHA)
American Association for the Advancement of Science (AAAS)
Environmental Mutagen Society (EMS)
Toxicological databases
Agency of Toxic Substances and Disease Registry (ATSDR)
Integrated Risk Information System (EPA/IRIS)
National Toxicology Program (NTP)
Registry of Toxic Effects of Chemical Substances (RTECS)
Toxicology Data Network (TOXNET)
Literature search
Chemical Abstracts Service (CAS)
PubMed literature search (PubMed)
Data resources
World Resources Institute (WRI)
U.S. Geological Survey (USGS)
The Risk Assessment Information System (RAIS)
International links
The United Nations Environmental Program (UNEP)
The International Program on Chemical Safety (IPCS)
Various other links
National Center for Computational Toxicology (NCCT)
National Academy Press (NAP)
Radiation links:
University of Minnesota – Radon
UNSCEAR reports (free to download) (UNCEAR)
NCRP online (NCRP)
Because
the NRC site can be hard to navigate, here is a direct link for Title
10 (Energy) of the Code of Federal Regulations, Part 20 (Standards for Protection Against Radiation)
Nuclear Regulatory Commission (NRC)
Nuclear and Radiation Studies Board (NRSB)
Idaho State University - tritium
NRC - tritium in groundwater
International Atomic Energy Agency (IAEA)
International Commission on Radiological Protection (ICRP)