TS 1507 ISO 31-9

TS 1507 ISO 31-9 is a terminology standard within the International System of Units that sets out names and symbols for quantities and units used in atomic and nuclear physics. Its focus is on consistent notation for the measurement language of this field, and it also provides conversion factors where appropriate.

Why terminology matters in atomic and nuclear physics

Atomic and nuclear physics works at scales where quantities are highly specialized and context-sensitive. Energy, mass, cross section, half-life, activity, and dose may all appear in the same technical environment, but their correct symbols and names help keep calculations, reports, and reference data unambiguous. The standard’s value lies in harmonising how these quantities are named and written, so the same concept is not presented in conflicting forms across documents.

What this part covers in practical terms

• Names and symbols for quantities related to atomic and nuclear physics.
• Names and symbols for the corresponding units.
• Conversion factors where they are appropriate to provide.
• Consistent SI-based terminology for technical communication.
• A common notation framework for experimental, computational, and reference use.

This record represents a TS 1507 edition based on ISO 31-9:1992 with Amendment 1, so its subject is the terminology of atomic and nuclear physics rather than the underlying physics itself. It addresses how the subject area is named and expressed, not laboratory methods or physical laws. That makes it especially useful wherever measurement terms must be read, compared, and reported consistently.