High-energy radiation refers to electromagnetic waves or particles with very high energy levels, typically in the range of X-rays, gamma rays, or subatomic particles like protons and neutrons. This type of radiation is characterized by its ability to penetrate through materials and cause ionization, making it potentially harmful to living organisms. Researchers in this area study the properties and effects of high-energy radiation on various materials, as well as its applications in fields such as medical imaging, cancer therapy, and materials testing. They also investigate ways to protect against and mitigate the harmful effects of exposure to high-energy radiation.