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It is limited by constraints mentioned, and by itself gives only a fuzzy approximation.Also note, you cannot Carbon date glass, metal, or pottery. You could perhaps find a bit of leftover plant material from the crock, wine residue from the bottle, or blood on the knife. An isotope is an element with the same “atomic number” (number of protons) , but a different “atomic weight” ( protons neutrons electrons.) Some isotopes are stable, which means they don't change over time ( well… Regular Carbon, C-12 is the most common isotope of Carbon.relatively long times, as in millions or billions of years)Most common Isotopes of Carbon Carbon- C-126- Neutrons6- Protons Natural abundance- 98.93%Half life- Stable Mass- 12u Carbon- C-137- Neutrons6- Protons Natural abundance- 1.109%Half life- Stable Mass- 13.003355 u Radiocarbon, C-148- Neutrons6- Protons Natural abundance- 1 part per trillion Half life- 5,730 ± 40 years Mass- 14.00324u____________________OK. We take Carbon from a sample of biological material, and measure the ratio of stable Carbon to unstable Radiocarbon, essentially C-12 to C-14.So maybe that is more information than you wanted, but it's important to be aware of. Since C-14 has a half life of about 5,700 years, and we know the normal ratio in fresh biological material, we have a “clock” to measure the age of the sample. This is where it gets a bit fuzzy…Yes, it's reliable, within certain constraints.The method is widely used by Pleistocene geologists, anthropologists, archaeologists, and investigators in related fields.

how carbon dating works-82

BP, in strata known by other methods to be only 10,000 yrs.The resulting radiocarbon combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire in a sample from a dead plant or animal such as a piece of wood or a fragment of bone provides information that can be used to calculate when the animal or plant died.The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.The actual measurement of the ratio is quite accurate. If someone told you that they have Carbon dated a sample to October 13, 1492, your BS detector should immediately start flashing.Carbon dating is an excellent tool, along with many others, to determine age and chronology.

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