References
- United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), Sources and Effects of Ionizing Radiation, Annex B Exposures from natural radiation sources, 2000.
- Environmental Protection Department, Control of Radon Concentration in New Buildings (Practice Note PN 1/99), 1999.
- Radiation Health Unit, Department of Health, Leaflet on Radiation Health, Series No. 6: Ionizing Radiation,2005.