Wine can be dated by the amount of radioactive carbon from nuclear activity they contain
More here: How atom bomb tests could help detect wine fraud | Science | The Guardian
Harmless amounts of radioactive carbon have been found in wines made from grapes harvested since the last atmospheric atomic bomb tests were carried out in the 1960s.
But the "bomb pulse" of radioactive carbon lingering in the alcohol of wines produced since could be a good thing for wine dealers and collectors.
Scientists have been able to pinpoint a wine's vintage to within a year by analysing the levels of radioactive carbon in the wine, a technique they say could help detect fraudulent attempts to repackage cheap plonk as a high-end tipple.