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2. Hazard symbol - Wikipedia

   en.wikipedia.org/wiki/Hazard_symbol

   Hazard symbols are recognizable symbols designed to warn about hazardous or dangerous materials, locations, or objects, including electromagnetic fields, electric currents; harsh, toxic or unstable chemicals (acids, poisons, explosives); and radioactivity. The use of hazard symbols is often regulated by law and directed by standards organizations.

3. ISO 21482 - Wikipedia

   en.wikipedia.org/wiki/ISO_21482

   ISO 21482 is a technical standard that specifies the design and usage of a "supplemental radiation warning symbol", a warning symbol.It is intended to warn people of the dangers of radiation hazards posed by sealed sources, and encourage the viewer to get away from the source.

4. File:Radiation warning symbol-US.svg - Wikipedia

   en.wikipedia.org/wiki/File:Radiation_warning...

   Description. Radiation warning symbol-US.svg. Correct US radiation warning symbol. Based on specification from [1]. The black-on-yellow (international) symbol can be found at Radiation warning symbol.svg. The black-on-yellow version is acceptable in the US as well. For a version that is black with no background, see Radiation warning symbol2.svg.

5. File:Radiation warning symbol.svg - Wikipedia

   en.wikipedia.org/wiki/File:Radiation_warning...

   File:Radiation warning symbol.svg. Size of this PNG preview of this SVG file: 600 × 600 pixels. Other resolutions: 240 × 240 pixels | 480 × 480 pixels | 768 × 768 pixels | 1,024 × 1,024 pixels | 2,048 × 2,048 pixels. Original file ‎ (SVG file, nominally 600 × 600 pixels, file size: 646 bytes) This is a file from the Wikimedia Commons.

6. Radioactive contamination - Wikipedia

   en.wikipedia.org/wiki/Radioactive_contamination

   The radiation warning symbol (trefoil) Alpha radiation consists of helium-4 nucleus and is readily stopped by a sheet of paper. Beta radiation, consisting of electrons, is halted by an aluminium plate. Gamma radiation is eventually absorbed as it penetrates a dense material. Lead is good at absorbing gamma radiation, due to its density.

7. Long-term nuclear waste warning messages - Wikipedia

   en.wikipedia.org/wiki/Long-term_nuclear_waste...

   Long-term nuclear waste warning messages are communication attempts intended to deter human intrusion at nuclear waste repositories in the far future, within or above the order of magnitude of 10,000 years. Nuclear semiotics is an interdisciplinary field of research, first established by the American Human Interference Task Force in 1981.