Radioactivity
A radioactivity is the spontaneous emission of matter or energy from the nucleus of an unstable atom (the emitted matter or energy is usually in the form of alpha or beta particles, gamma rays, or neutrons).
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| Radionuclides | ■■■■ |
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| Atom | ■■■ |
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| Empty planchet | ■■■ |
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| Background (radiation) | ■■■ |
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