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The chance of heads is 50 percent, no matter what has happened before.

The probability concept aligns with the traditional definition of half-life.

All three laboratories found samples of the shroud contain 92 percent of the Part of the Shroud of Turin, which shows a remarkable negative imprint likeness of Jesus complete with evidence of crucifixion wounds.

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.

Half of what remains **decays** in the next half-life, and half of that in the next, and so on.

This is exponential **decay**, as seen in the graph of the number of nuclei present as a function of time. Radioactive **carbon** has the same chemistry as stable **carbon**, and so it mixes into the biosphere, where it is consumed and becomes part of every living organism.

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.

(a) The **decay** constant shows that 0.0568 percent of the nuclei in a **carbon**-11 sample will **decay** each second.

Another way of considering the **decay** constant is that a given **carbon**-11 nuclei has a 0.0568 percent probability of **decaying** each second.

*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.