Carbon 14 and carbon dating

Radiocarbon dating uses isotopes of the element carbon. Cosmic rays – high energy particles from beyond the solar system – bombard Earth’s upper atmosphere continually, in the process creating the unstable carbon-14. Because it’s unstable, carbon-14 will eventually decay back to carbon-12 isotopes.

Because the cosmic ray bombardment is fairly constant, there’s a near-constant level of carbon-14 to carbon-12 ratio in Earth’s atmosphere.

Green plants absorb the carbon dioxide, so the population of carbon-14 molecules is continually replenished until the plant dies.

Until this century, relative dating was the only technique for identifying the age of a truly ancient object.

By examining the object's relation to layers of deposits in the area, and by comparing the object to others found at the site, archaeologists can estimate when the object arrived at the site.

is a technique used by scientists to learn the ages of biological specimens – for example, wooden archaeological artifacts or ancient human remains – from the distant past.

It can be used on objects as old as about 62,000 years.


Leave a Reply

  1. Free sex older girls dating 11-Nov-2017 21:33

    “Cressida, she’s a very modern woman, I think,” she described.

  2. Free teen chat webcam vietnam 15-Sep-2017 12:12

    So, the question of the hour is: who is Lewis Hamilton dating currently? When someone takes a look at Lewis Hamilton’s dating history, it would look like a Casanova’s little black book!

  3. Argentina free webcam chat 17-Jan-2018 09:00

    Halloween will be coming a bit early when the Nekromantix orchestrate a dead man's party of psychobilly music Friday night at the Borderline in Thousand Oaks.

  4. Sexchat no joinup 14-Dec-2017 13:08

    Both Ways is the free bisexual dating / community app for bi, bi-curious singles to meet bisexual men, women, couples, LGBT singles and threesome lovers in your local area.

  5. dating usan women 05-Sep-2017 14:34

    "They have been dating under the radar for nearly a year," a source said.

  6. nz dating service 25-Jul-2017 17:46

    Whether a book is in the public domain may vary country to country.