A Scotch-Drinking Physicist Suspects That the 50-Year-Old Scotch S/he Purchased

A Scotch-drinking physicist suspects that the 50-year-old Scotch s/he purchased was misrepresented.Reasoning that water must contain tritium because this isotope is produced in the atmosphere by cosmic rays, s/he uses the 3H concentration in the Scotch to determine when it was bottled.S/he finds that the 3H concentration in the Scotch was 64% that of the 3H concentration in the water on the Isle of Islay, where the Scotch was bottled.Approximately how old is this "50-year-old" Scotch? (The half-life of tritium is 12.3 years.)

A) 6 years
B) 8 years
C) 12 years
D) 24 years
E) It really was 50 years old.