EN ISO 361:2015
(Main)Basic ionizing radiation symbol (ISO 361:1975)
Basic ionizing radiation symbol (ISO 361:1975)
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.
Grundsymbol für ionisierende Strahlung (ISO 361:1975)
Symbole de base pour les rayonnements ionisants (ISO 361:1975)
Osnovni simbol za ionizirno sevanje (ISO 361:1975)
Določa obliko, razmerja, uporabo in omejitve pri uporabi simbola (tudi v primerih, ko se uporablja ob drugih simbolih ali besedah). Simbol se mora uporabljati za označevanje dejanske ali možne prisotnosti ioniziranega sevanja (vključno z žarki gama in rentgenskimi žarki, elektroni z visoko hitrostjo, nevtroni, protoni in drugimi jedrskimi delci, pri čemer zvočni valovi in druge vrste elektromagnetnih valov niso vključeni). Ne določa stopenj sevanja, pri katerih se mora simbol uporabiti.
General Information
- Status
- Published
- Publication Date
- 13-Oct-2015
- Withdrawal Date
- 13-Apr-2016
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 14-Oct-2015
- Due Date
- 04-Dec-2016
- Completion Date
- 14-Oct-2015
Relations
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Referred By
EN 17449:2022 - Safety of machinery - Safety requirements to finishing lines for metal strip - Effective Date
- 28-Jan-2026
Overview
EN ISO 361:2015 (ISO 361:1975) specifies the basic ionizing radiation symbol used to indicate the actual or potential presence of ionizing radiation. Adopted by CEN from ISO, the standard defines the symbol’s intended use, required prominence, and the types of radiation covered (gamma and X‑rays, alpha and beta particles, high‑speed electrons, neutrons, protons and other nuclear particles). It explicitly excludes non‑ionizing phenomena such as sound waves, radio waves and visible/infra‑red/ultra‑violet light. The standard does not set threshold radiation levels for when the symbol must be used.
Key topics and requirements
- Shape and proportions: The symbol’s design and proportions are specified and must be maintained when reproduced. (Prints for reproduction can be obtained from ISO.)
- Size and prominence: The symbol should be as prominent as practical and sized consistently with the equipment or material so it can be read from a safe distance.
- Scope of application: Used to signify actual or potential presence of ionizing radiation or radioactive materials.
- Accompanying information: The basic symbol may be accompanied by additional symbols or words to indicate the type of source, radiation type, limits of occupancy or other precautions - provided these do not detract from the symbol’s clarity.
- Restrictions on use: The symbol shall be displayed only to indicate ionizing radiation hazards as defined in the standard. Additional markings should preferably be limited to internationally adopted symbols for specific purposes.
- No dose criteria: The standard does not define radiation level thresholds or regulatory dose limits for symbol use.
Applications
- Radiation hazard signage on equipment, containers, doors, storage areas and transport packaging for radioactive materials.
- Labels and plates on medical, industrial and research devices that produce ionizing radiation (e.g., X‑ray machines, accelerators, sealed sources).
- Facility and site marking for nuclear installations, laboratories and storage facilities.
- Safety documentation, manuals and training materials where standard graphical identification of ionizing radiation is required.
Who uses this standard
- Radiation protection officers and safety managers
- Equipment manufacturers and designers
- Signage and labeling suppliers
- Regulatory authorities and compliance auditors
- Facility planners in medical, industrial and research sectors
- Standards developers and technical committees
Related standards
EN ISO 361:2015 is the CEN adoption of ISO 361 and sits alongside other international and national guidance on safety signs, graphical symbols and radiation protection. Users should apply EN ISO 361 in combination with local regulations and any industry‑specific signage requirements to ensure compliant and effective hazard communication.
Keywords: ionizing radiation symbol, EN ISO 361:2015, ISO 361, radiation warning symbol, radiation protection, radioactive materials, signage, labeling, safety symbol.
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Frequently Asked Questions
EN ISO 361:2015 is a standard published by the European Committee for Standardization (CEN). Its full title is "Basic ionizing radiation symbol (ISO 361:1975)". This standard covers: 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.
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.
EN ISO 361:2015 is classified under the following ICS (International Classification for Standards) categories: 01.080.20 - Graphical symbols for use on specific equipment; 13.280 - Radiation protection. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 361:2015 has the following relationships with other standards: It is inter standard links to EN 60601-2-17:1996/A1:1996, EN 62598:2013, EN 60601-2-17:1996, EN 60405:2007, EN 61010-1:2010, EN 17449:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 361:2015 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2015
Osnovni simbol za ionizirno sevanje (ISO 361:1975)
Basic ionizing radiation symbol (ISO 361:1975)
Grundsymbol für ionisierende Strahlung (ISO 361:1975)
Symbole de base pour les rayonnements ionisants (ISO 361:1975)
Ta slovenski standard je istoveten z: EN ISO 361:2015
ICS:
01.080.20 *UDILþQLVLPEROL]DSRVHEQR Graphical symbols for use on
RSUHPR specific equipment
13.280 Varstvo pred sevanjem Radiation protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 361
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2015
EUROPÄISCHE NORM
ICS 01.080.20; 13.280
English Version
Basic ionizing radiation symbol (ISO 361:1975)
Symbole de base pour les rayonnements ionisants (ISO Grundsymbol für ionisierende Strahlung (ISO
361:1975) 361:1975)
This European Standard was approved by CEN on 27 September 2015.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 361:2015 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 361:1975 has been prepared by Technical Committee ISO/TC 85 “Nuclear energy,
nuclear technologies, and radiological protection” of the International Organization for Standardization
(ISO) and has been taken over as EN ISO 361:2015 by Technical Committee CEN/TC 430 “Nuclear
energy, nuclear technologies, and radiological protection” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2016, and conflicting national standards shall be
withdrawn at the latest by April 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 361:1975 has been approved by CEN as EN ISO 361:2015 without any modification.
INTERNATIONAL STANDARD
INTERNATIONAL ORGANIZATION FOR STA
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