TS 2416

TS 2416 defines the basic symbol used to indicate ionizing radiation. It serves as a quickly recognisable visual marker in radiation-related equipment, signage, and warning arrangements. The standard is focused on what the symbol signifies and which radiation types it relates to, helping keep marking practice consistent across different applications.

Radiation types covered by the symbol

The standard covers gamma and X-rays, as well as alpha and beta particles, high-speed electrons, protons, and nuclear particles. This distinction matters because ionizing radiation refers to particle or wave forms capable of producing ionisation as they pass through matter. In practice, the symbol is used in nuclear facilities, radiation sources, laboratories, and other technical areas where clear marking is required.

What is outside the scope

Sound and radio waves, visible light, infrared radiation, and ultraviolet radiation are outside the scope of the standard. That boundary is important because it separates ionizing radiation from non-ionizing electromagnetic energy. In general technical use, the basic ionizing radiation symbol belongs to a wider family of graphic signs that communicate hazard type in a concise and widely understood way.

This TS edition is published as equivalent to ISO 361:1975, aligning the symbol’s meaning with internationally recognised marking practice.