![]() That is why those living in Denver, Colorado (altitude of 5,280 feet) receive a higher annual radiation dose from cosmic radiation than someone living at sea level (altitude of 0 feet). The higher the altitude, the higher the dose. ![]() Radiation levels increase as you get closer to the source, so the amount of cosmic radiation generally increases with elevation. Some particles make it to the ground, while others interact with the atmosphere to create different types of radiation. Cosmic RadiationĬosmic radiation comes from extremely energetic particles from the sun and stars that enter Earth’s atmosphere. There can be large variances in natural background radiation levels from place to place, as well as changes in the same location over time. Cosmic radiation from space also contributes to the background radiation around us. The human body even contains some of these naturally-occurring radioactive minerals. Naturally occurring radioactive minerals in the ground, soil, and water produce background radiation. is present on Earth at all times. The majority of background radiation occurs naturally from minerals and a small fraction comes from man-made elements. The majority of background radiation occurs naturally and a small fraction comes from man-made elements. Background radiation Background radiationRadiation that is always in the environment.
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