1. ISO, 1995. Guide to the Expression of Uncertainty in Measurement, 2nd Edition, ISO, Geneva.
2. ISO, 1996. X and Gamma Reference Radiation for Calibrating Dosemeters and Doserate Meters and for Determining their Response as a Function of Photon Energy, ISO 4037-1. ISO, Geneva.
3. ISO, 1997. X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy, ISO 4037-2. ISO, Geneva.
4. IAEA, 2000. Calibration of radiation protection monitoring instruments. Safety Report Series No 16.
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