18 days
After one half-life (6 days), the radioactivity would be 50% of the starting amount. After two half-lives (12 days), it would be 25% of the starting amount. And after three half-lives (18 days), it would be 12.5% of the starting amount.
Manganese-52 has a half-life of 6 days. How many days would a scientist have to wait for the radioactivity to be 12.5% the starting amount?
6
12
18
24
1 answer
1 answer