The symbol will not be located on building access doors, transportation packages or containers. "The new ionizing radiation warning symbol (ISO 21482) is the latest successful result of long-standing ...

A multi-institutional team of physicists and engineers has developed a laser-based radiation detection system that operates from as far away as 10 meters and perhaps farther. Their research is ...

More information: Silin Fu et al, Steering Laser-Produced THz Radiation in Air with Superluminal Ionization Fronts, Physical Review Letters (2025). DOI: 10.1103/PhysRevLett.134.045001.