Dating wine tritium

A radioisotope can be depicted by its atomic number or chemical symbol and by its mass number that indicates the total number of protons and neutrons in the nucleus of the radioisotope. Together with two other stable isotopes of hydrogen (hydrogen-1 and hydrogen-2), and with isotopes of carbon, nitrogen, oxygen, phosphorous and sulfur, tritium provides a powerful tool for understanding chemical, biological and geochemical transformations.

Tritium has also found widespread uses as a tracer in medicine, agriculture and industry.

The discovery of tritium in 1932 involved the work of several very eminent scientists that included Lord Rutherford, Sir John Cockroft, Ernest Lawrence, Luis Alvarez, Willard Libby--just to name a few.

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The flourishing grape-vines are in equilibrium with their environment and take the material, which they need to grow and to form fruit, from their environment.

Tritium is produced naturally in the upper atmosphere by interaction of nitrogen, and, to a lesser extent, oxygen with cosmic rays.

The glass on the left has sixty-four times fewer tritium counts than the glass on the right. What is the age of the wine in the glass on the left, and the glass on the right? What assumption(s) do you have to make in order to compare their tritium counts? Is this an accurate assumption in light of the events of the post- World War II world?

So far, I've figured out the rate to be k= 0.005621 but I'm lost on what to do after that a.