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Radioactive radiation, also known as ionizing radiation, originates from unstable atomic nuclei that release energy in the form of particles or electromagnetic waves. The sources of radioactive radiation can be broadly classified into natural and artificial origins. Natural sources include cosmic radiation from outer space, terrestrial radiation from naturally occurring radioactive materials in the earth’s crust, and internal radiation from radioactive isotopes present in the human body. Cosmic radiation mainly consists of high-energy particles from the sun and other celestial bodies. Terrestrial radiation arises from elements such as uranium, thorium, and radon, which are present in rocks, soil, and water. Radon, a colorless and odorless gas, is one of the most significant contributors to natural radiation exposure and tends to accumulate in enclosed spaces like homes and mines. Internal radiation is received when radioactive isotopes such as potassium-40 or carbon-14 are ingested through food, water, or air, becoming part of the body’s tissues and organs. Artificial sources of radioactive radiation are primarily linked to ____ ________ _________ ______ ____ ______ ________ ____ _______.
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