1. ICRU 52, 1994. Particle Counting in Radioactivity Measurements, ICRU 52, 1994-11-1.
2. ISO, 1988. Reference Sources for the Calibration of Surface Contamination Monitors—Beta-Emitters (Maximum Beta Energy Greater than 0.15 MeV) and Alpha-Emitters, International Organization for Standardization (ISO) 8769 1st Edition, 1988-06-15.
3. ISO/TAG4/WG3, 1995. Guide to the Expression of Uncertainty in Measurement.
4. ISO/IEC Guide, 1997. Proficiency Testing Interlaboratory Comparisons—Part 1. Development and Operation of Proficiency Testing Schemes, ISO/IEC Guide 43-1, 2nd Edition, 1997.