Electromagnetic radiation with a wavelength greater than X-rays is known as "gamma radiation." Gamma rays have even shorter wavelengths and higher frequencies than X-rays. While X-rays have wavelengths ranging from about 0.01 to 10 nanometers (nm), gamma rays have wavelengths less than 0.01 nm, making them the most energetic and highest frequency form of electromagnetic radiation.
Gamma rays are typically emitted during nuclear processes, such as radioactive decay or nuclear reactions. They have significant penetrating power and are often used in medical imaging, cancer treatment, and industrial applications. In comparison to X-rays, gamma rays carry even more energy and can cause ionization in matter more readily. Due to their extremely high energy, gamma rays require specialized equipment and precautions for handling and shielding to protect against their potentially harmful effects.