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Radioactive radiation originates from both natural and artificial sources. Natural sources include cosmic radiation from the sun and other celestial bodies, as well as terrestrial radiation from naturally occurring radioactive materials such as radon, uranium, and thorium in the Earth's crust. Additionally, human activities such as mining, industrial operations, and even the use of ___ ______ _______ ______ _____ _______ _____ __________ ___ ________.
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