La radioactivité est le phénomène physique par lequel des noyaux atomiques instables se transforment spontanément en d'autres atomes en émettant simultanément des particules de matière et de l'énergie.
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FR
La radioactivité est le phénomène physique par lequel des noyaux atomiques instables se transforment spontanément en d'autres atomes en émettant simultanément des particules de matière et de l'énergie.
Wikipedia
Phénomène par lequel un noyau atomique instable émet du rayonnement
Wikidata
Propriété qu'ont certains noyaux atomiques de se désintégrer spontanément, avec une perte d'énergie par l'émission d'une particule chargée et/ou de rayonnement gamma.
OmegaWiki
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