P7.5 Activity and half life Flashcards
1
Q
What is the activity?
A
Number of unstable atoms in the source that decay per second
2
Q
What is the unit of activity?
A
Is the Becquerel which 1 decay per second
3
Q
What is the count rate?
A
The number of counts per second produced by the Geiger counter
4
Q
What is the half-life?
A
The average time taken for the count rate to fall by half is always the same
5
Q
What is the count rate after n half lives?
A
The initial count rate / 2^n
