To determine the age of a sample, the SCAR technique uses a highly stable infrared laser to excite carbon dioxide molecules in a mirrored cavity.

When the laser is turned off, trapped light dies away in the cavity (or “rin... To determine the age of a sample, the SCAR technique uses a highly stable infrared laser to excite carbon dioxide molecules in a mirrored cavity.

You might remember that it was mentioned earlier that the amount of carbon-14 in living things is the same as the atmosphere.

Then the radiocarbon dating measures remaining radioactivity.

By knowing how much carbon-14 is left in a sample, the age of the organism and when it died can be worked out.

Carbon dating was used routinely from the 1950s onward, and it confirmed the age of these historical remains.

Radiocarbon dating is a method used to date materials that once exchanged carbon dioxide with the atmosphere; in other words, things that were living.

Ever wondered how scientists know the age of old bones in an ancient site or how old a scrap of linen is?

The technique used is called carbon dating and in this lesson we will learn what this is and how it is used. Carbon dating, or radiocarbon dating, is a method used to date materials that once exchanged carbon dioxide with the atmosphere. In the late 1940s, an American physical chemist named Willard Libby first developed a method to measure radioactivity of carbon-14, a radioactive isotope.However, once the organism dies, the amount of carbon-14 steadily decreases.By measuring the amount of carbon-14 left in the organism, it's possible to work out how old it is.Once the organism dies, the amount of carbon-14 reduces by the fixed half-life - or the time required for half of the original sample of radioactive nuclei to decay - of 5,730 years, and can be measured by scientists for up to 10 half-lives.Measuring the amount of radioactive carbon-14 remaining makes it possible to work out how old the artifact is, whether it's a fossilized skeleton or a magnificent piece of artwork. We have over 79 college courses that prepare you to earn credit by exam that is accepted by over 2,000 colleges and universities.Carbon-14 is a radioactive isotope and is present in all living things in a constant amount.