Carbon dating forensic science

6) The useful range for carbon dating is between 100 and 30,000 years. 7) Potassium-40 has a half-life of 1.3 billion years and decays to argon-40. Arneborg, J., J.

Earth is continuously bombarded by high energy protons, neutrons and electrons.

The protons are quickly captured by the electrons to form hydrogen gas.

Once the plant or animal dies the carbon-14 decays to nitrogen-14 at a steady rate.

The longer an organism is dead the lower the carbon-14 content. An archeologist extracts a gram of carbon from an ancient bone and measures the emitted radioactivity at between 15 to 16 beta emissions per minute. A one gram carbon sample was obtained and beta emissions recorded.

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4) How are isotopes of carbon-12 and carbon-14 different? 5) A bone fragment from an ancient burial site was unearthed and analysed.

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