6.5 Radioactive half life? Flashcards
1
Q
How do you measure the radioactivity of a sample of radioactive material ?
A
By measuring the count rate.
2
Q
What is the half life of a radioactive isotope
A
The average time it take for the number of nuclei of the isotope in a sample to halve
3
Q
What happens to the original count rate of a radioactive sample after two half lives have passed?
A
It has decreased to one quarter of its original value
