Radioactive materials are substances that emit radiation due to the decay of their atomic nuclei. This radiation can take the form of alpha particles, beta particles, or gamma rays. Common examples of radioactive materials include isotopes like uranium, radium, and cesium. These materials are used in various applications, including medical treatments, energy production, and scientific research. The presence of radioactive materials requires careful handling and regulation to protect human health and the environment. Organizations such as the Nuclear Regulatory Commission (NRC) oversee the use and disposal of these materials to ensure safety. Proper storage and containment are essential to prevent exposure to harmful radiation.