Definitions: Radioactivity Flashcards
1
Q
Radioactivity
A
Spontaneous decay of an unstable nucleus by the release of alpha,beta and gamma particles
2
Q
Alpha particle
A
A high speed, positively charged helium nucleus
3
Q
Beta particle
A
A high speed electron
4
Q
Gamma ray
A
High energy electromagnetic radiation with no charge and high penetrating power
5
Q
Radio-isotopes
A
Isotopes which are unstable and give out radiation
6
Q
Half-life
A
The time taken for half of the nuclei in any given sample to decay
7
Q
Nuclear reaction
A
A reaction which occurs within the nucleus of an atom
