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Radiocarbon Dating

Living things...

Question

Living things contain carbon in two forms, $c a r b o n - 12$ which is stable and $c a r b o n - 13$ that decays and declines in proportionate quantity. The technique that uses this principle for determining the age of fossils, skeletons, old trees and dinosaurs is known as:

A

Fossil carbon

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B

Radio-carbon dating

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C

C a r b o n - 12

dating

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D

The Carbon Age

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Solution

The correct option is B Radio-carbon dating
Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material (materials that originated from living organisms e.g. skeletons, old trees, dinosaurs, etc.) by using the properties of radiocarbon, a radioactive isotope of carbon.

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Q. What is principle or method used in carbon dating method to find the age of fossils?

Q. The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. This activity arises from the small proportion of radioactive

_{6}^{14} C

present with the stable carbon isotope

_{6}^{12} C

. When the organism is dead, its interaction with the atmosphere (which maintains the above equilibrium activity) ceases and its activity begins to drop. From the known half-life ( 5730 years) of

_{6}^{14} C

, and the measured activity, the age of the specimen can be approximately estimated. This is the principle of

_{6}^{14} C

dating used in archaeology. Suppose a specimen from Mohenjodaro gives an activity of 9 decays per minute per gram of carbon. Estimate the approximate age of the Indus-Valley civilisation.

Carbon dating is used to determine the age of fossils. It is estimated by:

Q. Carbon dating is best suited for determining the age of fossils if their age in years is of the order of:

Q. The normal activity of living carbon-containing matter is found tobe about 15 decays per minute for every gram of carbon. This activityarises from the small proportion of radioactive 146 C present with thestable carbon isotope 126 C . When the organism is dead, its interactionwith the atmosphere (which maintains the above equilibrium activity)ceases and its activity begins to drop. From the known half-life (5730years) of 146 C , and the measured activity, the age of the specimencan be approximately estimated. This is the principle of 146C dating used in archaeology. Suppose a specimen from Mohenjodaro givesan activity of 9 decays per minute per gram of carbon. Estimate theapproximate age of the Indus-Valley civilisation.

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