1. laying down requirements for the protection of the health of the general public with regard to radioactive substances in water intended for human consumption;Council Directive 2013/51/Euratom of 22 October;Off. J. Eur. Union L,2013
2. Environmental Radioactivity Proficiency Test Exercise, 2008. National Physical Laboratory, Middlesex.
3. Guidelines for Drinking Water Quality, Fourth Edition. World Health Organisation, Geneva.
4. ISO 13528 Statisitical Methods for use in Proficiency Testing by Interlaboratory Comparisons. International Organization for Standardization, Geneva.
5. ISO 17025 General Requirements for the Competence of Testing and Calibration Laboratories. International Organization for Standardization, Geneva.