The activity of a sample of a radioactive isotope is 1800Bq. If this isotope has a half-life of 16 days, what is the activity after 16 days?, 24 days?, and 60 days?
Radioactivity is half as much (900 Bq) after 16 days. For other times t (in days), use the equation
Activity = 1800 * (1/2)^(t/16)
t/16 is an exponent.