ISO 361:1975
Subscribe to updates

Basic ionizing radiation symbol

This standard was last reviewed and confirmed* in 2015.

*Therefore this version remains current


Specifies shape, proportions, application, restrictions on the use of the symbol (possibly accompanied by additional symbols or words). Shall be used to signify the actual or potential presence of ionizing radiation (including gamma and X-rays. alpha and beta particles, high-speed electrons, neutrons, protons and other nuclear particles, but not sound waves and other types of electromagnetic waves). Does not specify the radiation levels at which it is to be used.


  • Document published on: 1975-10-01
    Edition: 1 (Monolingual) ICS: 01.080.20; 13.280
    Status: Published Stage: 90.93 (2015-03-19)
    TC/SC: ISO/TC 85 Number of Pages: 1
  • This standard has not been revised

  • No corrigenda or amendments available

Related standards

  • PDF

    This format preserves the paper layout, and is watermarked

  • EPUB

    This format allows documents to be read on tablets and smartphones


    Enhanced user-friendly colour PDF format


    See any updates made from previous versions at a glance


    Normally A4 size documents. Shipping costs apply


Swiss francs CHF 38

Add to basket

Got a question?

Check out our FAQs

Email customer services
or call us on +41 22 749 08 88
09:00 – 12:30, 14:00 – 17:00 (UTC+1).