Radon-222 has a half-life of 92.hours. How long would it take for the activity of a sample of the gas to be reduced to about 3% of its initial value?
1 Answer
Oct 17, 2016
It would take 19. days for the radon to decay.
Explanation:
The formula for the half-life of a first-order process is
#color(blue)(bar(ul(|color(white)(a/a) t_½ = (ln2)/kcolor(white)(a/a)|)))" "#
∴
The integrated formula for a first-order process is
#color(blue)(bar(ul(|color(white)(a/a) ln("A"_0/"A") = ktcolor(white)(a/a)|)))" "#