1. Agency for Toxic Substances and Disease Registry (ATSDR) (1990) Toxicological profile for thorium. U.S. Department of Health and Human Services, Public Health Service, Atlanta, GA
2. http://www.epa.gov/radiation/radionuclides/thorium.html . Accessed 26 Aug 2009
3. Wrenn ME, Singh NP, Cohen N, Ibrahim SA, Saccomanno G (1981) Thorium in human tissues. NUREG/CR-1227
4. Glover SE, Traub RJ, Grimm CA, Filby RH (2001) Radiat Prot Dosim 97:153
5. Smith H (1995), Age-dependent doses to members of the public from intake of radionuclides. Part 3: ingestion dose coefficients, vol 25. ICRP Publication 69, Pergamon Press, Oxford, p 39