Environmental radioactivity refers to the presence of radioactive materials in the environment, which can come from natural sources or human activities. Natural sources include cosmic rays, radon gas from the ground, and uranium in rocks. These materials emit radiation, which can be measured in various locations, such as soil, water, and air. Human activities, such as nuclear power generation and medical procedures, can also contribute to environmental radioactivity. This can lead to increased levels of radiation in certain areas, necessitating monitoring to ensure safety. Understanding environmental radioactivity is essential for assessing potential health risks and protecting ecosystems.