1. European Communities. 96/29/EURATOM Directive, 13th May 1996, Laying down basic safety standards for the protection of the health of workers and the general public against the dangers arising from ionising radiation. (1996).
2. Lopez-Ponte, M. A., Castellani, C. M., Currivan, L., Falk, R., Olko, P. and Wernli, C. Individual monitoring for internal exposure in Europe and the integration of dosimetric data. Radiat. Prot. Dosim.112(1), 69–119 (2004).
3. G. Etherington, C. Cossonet, D. Franck, J.I. Genicot, C. Hurteen, J-R. Jourdain, B. le Guen, T. Rahola, J. Sovijärvi, E.N. Stradling, E. Ansoborlo and P. Bérard. Optimisation of Monitoring for Internal Exposure (OMINEX). Report: NRPB - W60. (2004).
4. Werner, E., Oeh, U., Höllriegl, V., Roth, P. and Regulla, D. Monitoring of workers and members of the general public for the incorporation of thorium and uranium in the EU and selected countries outside the EU. GSF-Bericht 09/03. Final Report of EC Project, Contract 98-ET-03. GSF - Forschungszentrum 2003 ISSN 0721–1694.
5. International Atomic Energy Agency. Assessment of occupational exposures due to intakes of radionuclides. Safety Guide, No. RS-G-1.2 (Vienna: IAEA) (1999).