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. (December 2009)
ISO 31-9 gives name, symbol and definition for 51 quantities and units of atomic and "nuclear physics. Where appropriate, conversion factors are also given. Annex A includes names of symbols of the "chemical elements, Annex B the notation of symbols for chemical elements and "nuclides, Annex C the original names and symbols for nuclides of "radioactive series, Annex D examples of relations in different systems of equations using different systems of units.