Topic Four Flashcards
1
Q
What is radioactive decay
A
When an unstable nucleus changes to become more stable and give out radiation
2
Q
What is activity
A
The rate at which decay occurs measured in becquerels
3
Q
What is count rate
A
Number of decays recorded each second by a Geiger muller tube
4
Q
What is half life
A
The time it takes for the number of nuclei of the isotope in a sample to halve
