Scope
Names, symbols, definitions, and units for quantities used in atomic and nuclear physics — particle energies, cross sections, decay rates, radiation dosimetry, and nuclear reaction parameters.
What You'll Find
Numerical values of fundamental constants sourced from CODATA recommended values — users advised to check for updates
Defines the electronvolt (eV) as the energy gained by an electron crossing a 1 V potential difference in vacuum
Discusses the important distinction between stochastic quantities (following probability distributions) and non-stochastic quantities (based on expected values)
Second edition aligns definitions with ICRU Report 85a and makes remarks more physically precise
Obtain the Standard
Published by the International Organization for Standardization (ISO). Edition 2019 (2nd). Developed by ISO/TC 12 — Quantities and units.
Browse Entries
125 quantities defined in Part 10