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What is radioactivity?
Some forms of matter, called radionuclides, are inherently unstable at the nuclear level. They are said to be radioactive because they lose energy in the form of radiation as they gradually become more stable.
Some forms of matter, called radionuclides, are inherently unstable at the nuclear level. They are said to be radioactive because they lose energy in the form of radiation as they gradually become more stable.