1. Bulgarian Ordinance, 2005. N 30 from 31.10.2005, Ordinance for the conditions and order for patients radiation protection in the case of medical exposure. Sofia, Bulgaria.
2. Chisté, V., Bé, M.-M., 2007. Table de Radionucléides (Table of Radionuclides). Atomic and nuclear data, Recommended data tables. LNE-LNHB, CEA Saclay, Gif-sur-Yvette, France 〈http://www.nucleide.org/DDEP_WG/DDEPdata.htm〉.
3. IEC 61145, 1992. International standard: calibration and usage of ionisation chamber systems for assay of radionuclides. Geneva, Switzerland.
4. IEC 61303, 1994. International standard: medical electrical equipment-radionuclide calibrators-particular methods for describing performance. Geneva, Switzerland.
5. IEC TR 61948-4, 2006. Nuclear medicine instrumentation—routine tests—part 4: radionuclide calibrators. Geneva, Switzerland.