ISO 31-9 gives name, symbol and definition for 51 quantities and units of atomic and
nuclear physics
Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions, in addition to the study of other forms of nuclear matter.
Nuclear physics should not be confused with atomic physics, which studies the ...
. 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
A nuclide (or nucleide, from nucleus, also known as nuclear species) is a class of atoms characterized by their number of protons, ''Z'', their number of neutrons, ''N'', and their nuclear energy state.
The word ''nuclide'' was coined by Truman ...
, Annex C the original names and symbols for nuclides of
radioactive
Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is consi ...
series, Annex D examples of relations in different systems of equations using different systems of units.
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