1. Asikainen, M. Natural radioactivity of ground water and drinking water in Finland. Report STL-A39 (Helsinki: Institute of Radiation Protection) (1982).
2. Salonen, L. 238U series radionuclides as a source of increased radioactivity in groundwater originating from Finnish bedrock, future groundwater resources at risk. IAHS Publ. No. 222, (Oxford: IAHS Press) pp. 71–84 (1994).
3. Mäkeläinen, I., Huikuri, P., Salonen, L., Markkanen, M. and Arvela, H. Radioactivity of drinking water in Finland—basis for quality requirements. STUK-A182 (Helsinki: STUK) (2001) (in Finnish).
4. Mäkeläinen, I., Salonen, L., Huikuri, P. and Arvela, H. Dose received and cancer risk from natural radionuclides in drinking water in Finland. In: Proceedings of the 5th International Conference on High Levels of Natural Radiation and Radon Areas held in Munich, Germany on 4–7 September 2000. BfS Schriften. Strahlenhygiene. High Levels of Natural Radiation and Radon Areas: Radiation Dose and Health Effects. Vol. II: 24, pp. 28–30 (2002).
5. Lahermo, P., Tarvainen, T., Hatakka, T., Huikuri, P., Ilmasti, M., Juntunen, R., Karhu, J., Kortelainen, N., Nikkarinen, M. and Väisänen, U. Chemical composition of well water in Finland—main results of the ‘One thousand wells’ project. Geological Survey of Finland, Current Research 1999–2000, Special paper 31, pp. 57–76 (2001).