TS EN ISO 361

TS EN ISO 361 defines the basic symbol used to indicate the actual or potential presence of ionizing radiation. It establishes a common graphic sign for identifying objects, devices, materials, or combinations of materials that emit ionizing radiation.

What the symbol is meant to communicate

Ionizing radiation is a form of radiation with enough energy to remove electrons from atoms as it passes through matter, which is why it requires clear marking and controlled handling. In general technical use, a standardized symbol helps people recognize at a glance that a device, enclosure, container, surface, or material set may involve a radiation source. Such symbols support language-independent warning and consistent visual communication across equipment and installations.

Where this standard applies

• The symbol to be used for the actual or potential presence of ionizing radiation.
• Identification of objects, devices, materials, or combinations of materials that emit ionizing radiation.
• A basic definition for the graphic sign itself, rather than a full set of installation or operational safety rules.

In practice, symbols of this kind are used on radiation-related equipment, access points to controlled areas, source enclosures, and technical products that require clear hazard identification. The standard itself is focused on selecting the correct symbol, not on prescribing exposure limits, system design, or protective procedures. For that reason, TS EN ISO 361 is a foundational reference for consistent radiation-warning marking in technical documentation and product identification.