Natural radiation refers to the ionizing radiation that occurs naturally in the environment. It comes from various sources, including cosmic rays from outer space, radon gas from the ground, and radioactive materials in soil and rocks. This type of radiation is present everywhere and contributes to the background radiation levels that we experience daily. The main types of natural radiation include alpha particles, beta particles, and gamma rays. While exposure to low levels of natural radiation is generally considered safe, prolonged exposure to higher levels can pose health risks, such as an increased chance of cancer. Understanding natural radiation helps us assess its impact on human health and the environment.