Question

How old is a bottle of wine if the tritium (3H) content is 25% that of a new wine? The half -life of tritium is 12.5 years?

Answer 1

$A = Ao×2^{-n}$

where Ao = initial content

A = Content after n half lives

$0.25Ao = Ao×2^{-n}$

n = 2 half lifes

so the umber of years = 2×12.5 = 25 years

so the wine bottel is 25 years old