Concept & Definition
What is radioactive decay?
The spontaneous process in which an unstable nucleus emits radiation to become more stable
Name one type of radiation emitted during radioactive decay.
Alpha, Beta, or Gamma.
What is half-life?
The time taken for the number of undecayed nuclei (or activity) to reduce to half.
What term describes the nucleus that undergoes radioactive decay?
An unstable nucleus.
Why does the decay rate decrease over time?
Because the number of undecayed nuclei decreases.
Does the half-life change when you have more material?
No, it stays the same.
What is meant by the “activity” of a radioactive sample?
The number of decays occurring per second.
Is radioactive decay predictable or unpredictable?
Unpredictable.
Why is half-life useful in medicine?
It helps doctors choose safe radioactive materials for imaging or treatment.