Carbon 12 and 14 dating site

The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate.Organisms capture a certain amount of carbon-14 from the atmosphere when they are alive.

But that assumes that the amount of carbon-14 in the atmosphere was constant — any variation would speed up or slow down the clock.However, the principle of carbon-14 dating applies to other isotopes as well.Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years.Preserved leaves in the cores — “they look fresh as if they’ve fallen very recently”, Bronk Ramsey says — yielded 651 carbon dates that could be compared to the calendar dates of the sediment they were found in.The recalibrated clock won’t force archaeologists to abandon old measurements wholesale, says Bronk Ramsey, but it could help to narrow the window of key events in human history.

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  1. Karen I got one also from craigs list- He wants to rent my rental for a honeymoon- Says wifes company will pay all with certified check curier delivery asap- He gives a chicago address that does not seem to be real and this seattle phone number This is a complete phone scam- Message left with computer voice "Kevin Harper" claiming there were charges pending against me and that I would be served with papers for court if I did not call and rectify the situation by giving my debit card number over the phone- When you try to reach them you are directed to a residential number in Atlanta Georgia, where a "Laura Little" proceeds with the same threats asking for your debit card number to avoid going to court- She claims to work for a law firm that DOES NOT EXIST- This is a SCAM- Do NOT give this person any of your personal information- My attorney is looking into this situation at this time They call me everyday and I don't answer numbers that I don't know They can leave a message and if I want to talk I will call them back But they don't leave a message I'm tired of getting these calls from differnt numbers from all over the place How do i stop them????