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Carbon dating confirms Keezhadi Excavation is from sangam era..

TNPSC Current Affairs July 2017

 The 2 samples sent by Archaeological survey of India for Carbon dating from Keezhadi site has confirmed by USA’s Beta Analitc Inc ,that it belongs to Sangam era which is more than 2,200 years old.
Carbon Dating has confirmed that 2 samples are belonging to 3rd Century BC and now it will help to reconstruct the ancient Tamil society.

About Carbon Dating: (source:NCERT)
  • Radiocarbon or carbon 14(C14) is a radioactive isotope of carbon which is present in all living objects. It decays like all radio-active substancs, at a uniform rate.
  • When an object is living, the process of the decay of C14 is neutralized by absorption of C14 through air and food.
  • However when an object ceases to be alive, its C14 content continues to decay at uniform rate but it ceases to absorb from C14 air and food.
  • By measuring the loss of C14 content in an ancient object, its age can be determined.
  • The decay of C14 takes place at a uniform rate. It is known that the half-life C14 of is 5568 years.

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