Nuclear Decay
Particles
100
Another name for the nuclei of helium (helium- 4)
What is an alpha particle?
100
A nuclear reaction in which a helium nucleus is emitted by the unstable isotope.
What is alpha decay?
200
Electrons emitted from the nucleus.
What are beta particles?
300
A type of radiation that is not a particle, but energy only that can only be stopped by a thick piece of lead or concrete.
What is gamma radiation?
400
The time it takes for half of a radioactive sample to decay.
What is half- life?
500
An unstable isotope that undergoes radioactive decay.
What is a radioisotope?
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