1. ANSI National Standards Institute, ANSI N42.22-1995, Traceability of Radioactive Sources to the National Institute of Standards and Technology (NIST) and Associated Instrument Quality Control.
2. D. D. Hoppes, J. M. R. Hutchinson, Appl. Radiation Isotopes 42(9) (1991) 893.
3. ANSI National Standards Institute, ANSI N42.23-1996, Measurement and Associated Instrumentation Quality Assurance for Radioassay Laboratories.
4. AME NQA-1-1994, Quality Assurance Program Requirements for Nuclear Facilities.
5. ISO/IEC Guide 25: 1990, General Requirements for the Competence of Calibration and Testing Laboratories.