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2. ISO, 2005. ISO 13528: Statistical Methods for Use in Proficiency Testing by Interlaboratory Comparisons, ISO, Geneva.
3. ISO, 2005. ISO 17025: General Requirements for the Competence of Testing and Calibration Laboratories, ISO, Geneva.
4. ISO, 2008. ISO Guide98-3: Uncertainty of measurement – Part 3: Guide to the Expression of Uncertainty in Measurement (GUM:1995), ISO, Geneva.
5. MEXT, 1992. Method of Radioactivity Measurement No.7: Gamma Ray Spectrometry by HPGe Detector, Ministry of Education, Culture, Sports, Science and Technology in Japan.