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The normal activity of living carbon - c...

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 know 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.

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