Radioactive Material Sign

Radioactive Material Sign – ISO 7010 Warning Symbol HS0007

This Radioactive Material sign warns crew and visitors that ionising radiation sources are stored, transported or in use in the marked area. It follows the internationally recognised ISO 7010 warning pictogram format, presenting the trefoil radiation symbol on the standard photoluminescent yellow triangle so the hazard reads instantly regardless of the reader’s first language. As SKU HS0007 in the Hazard Signs range, it is built for continuous marine exposure and suits gauging equipment rooms, radiographic testing bays, sealed-source storage lockers and cargo holds carrying radioactive material under the IMDG Code.

The pictogram is the internationally standardised trefoil, three black blades radiating from a central circle inside the black-bordered warning triangle, a symbol recognised on every continent and in every maritime jurisdiction without needing a word of translation. That universality matters because radioactive material cannot be detected by sight, smell or touch, so the sign is often the only warning a crew member, contractor or visiting surveyor will get before entering a controlled area. The photoluminescent base coat keeps the radioactive material warning visible for a period after lighting fails, which matters given how often radiation sources are stowed in below-deck compartments with limited natural light.

Why Radioactive Material Marking Matters

Because radioactive material gives no immediate physical warning of its presence, signage is the primary control that prevents accidental exposure, and a missing or unclear radioactive material sign can mean the difference between a controlled area being respected or wandered into by mistake. Clear marking also supports the ship’s radiation protection programme by defining exclusion zones for sealed sources, gauges and testing equipment, and it gives emergency responders an immediate, unambiguous indication of what they are dealing with in the event of a fire, collision or cargo incident involving a marked hold or locker.

Compliance and Certification

This sign is produced to align with IMO shipboard safety signage guidance and the ISO 7010 graphical symbol set, and it supports the segregation, stowage and hazard communication requirements set out in the IMDG Code for Class 7 radioactive material carried aboard vessels. A visible, standard-format radiation warning at the point of hazard is a documented control that flag-state inspectors, classification surveyors and ISM auditors specifically check for, and it forms part of the paper trail that demonstrates a vessel’s radiation safety arrangements are being actively managed rather than assumed. This is especially relevant where sealed sources are used intermittently for non-destructive testing, since the marked area may otherwise appear identical to any other compartment between inspections.

Installation Recommendations

Mount the sign at eye level directly on or beside the door, hatch or cabinet enclosing the radioactive material source, ensuring it is visible to anyone approaching from the main access route rather than only from one angle. Use the pre-drilled fixing holes with marine-grade fasteners for exterior bulkheads and high-vibration compartments, and the self-adhesive backing for interior cabinets and equipment housings. Recheck the sign during routine radiation safety audits and general rounds to confirm it has not been obscured by stowed equipment, since a hidden radioactive material sign provides no protection at all, and stowed equipment or cargo can accumulate around a marked locker between inspections without anyone noticing.

• 425 x 425mm rigid or self-adhesive format for steel, aluminium or GRP surfaces
• Photoluminescent base for visibility during power loss or blackout drills
• UV-stable, saltwater-resistant construction for long-term exterior exposure
• Self-adhesive or pre-drilled fixing options for fast, secure installation
• ISO 7010 compliant trefoil pictogram, language-independent and instantly recognisable

Order the HS0007 Radioactive Material sign today to keep controlled areas clearly marked ahead of your next flag-state inspection or ISM audit. Safety Sign Hub stocks the complete IMPA/ISSA-coded hazard sign range and ships marine-grade signage across Australia and to vessels in port, with bulk pricing for fleet orders.

See the full Hazard Signs range for related ISO 7010 warning pictograms, or browse our Fire Fighting Signs for IMO A.654(16) fire control signage to complete your vessel’s safety signage plan.

This radioactive material is an essential IMO-compliant maritime hazard sign for clearly marking radioactive materials or radiation sources aboard vessels, ensuring crew and visitor awareness in compliance with international shipping safety regulations. Browse our full range of hazard signs for more IMO-compliant maritime safety signage.