Activity and half-life Flashcards
1
Q
Activity - define it and unit
A
measure in Becquerel and is decay per second.
2
Q
Count rate
A
count per second
proportional to activity
initial count rate/2^n == count rate
(n = half lives)
3
Q
What is half-life
A
Time taken for the count rate to fall by half.
The number of nuclei in a sample to halve
The count rate to halve.
4
Q
Random nature of decay describe it
A
No one can exactly predict when one atom or nuclei will decay
But we can predict how many atom in a given period of time.
