German: Radioaktivität
Japanese: 放射能

Nuclear Physics. The property of unstable nuclei in certain atoms to spontaneously emit ionizing radiation in the form of alpha or beta particles and sometimes gamma rays. Becquerel (Bq) is the unit of radioactivity, equal to 1 nuclear disintegration per second. The radioactive half-life is the time required to reduce the amount of a radionuclide to one-half the amount originally present.

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