# Radioactive decay dating game

Therefore, the number of radioactive nuclei decreases from A more precise definition of half-life is that each nucleus has a 50 percent chance of surviving for a time equal to one half-life.

If an individual nucleus survives through that time, it still has a 50 percent chance of surviving through another half-life.

That is smaller amount than at the beginning of the hour, when This dates the material in the shroud to 1988–690 = 1300.

Our calculation is only accurate to two digits, so that the year is rounded to 1300.

(credit: Butko, Wikimedia Commons) Carbon-11 has a half-life of 20.334 min. If 1 kg of carbon-11 sample exists at the beginning of an hour, (b) how much material will remain at the end of the hour and (c) what will be the decay activity at that time?

Carbon-14 dating was not performed on the shroud until 1988, when the process had been refined to the point where only a small amount of material needed to be destroyed.

Samples were tested at three independent laboratories, each being given four pieces of cloth, with only one unidentified piece from the shroud, to avoid prejudice.

One of the most famous cases of carbon-14 dating involves the Shroud of Turin, a long piece of fabric purported to be the burial shroud of Jesus (see Figure 22.28).

This relic was first displayed in Turin in 1354 and was denounced as a fraud at that time by a French bishop.