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Question

An old sample of wood from an archaeological excavation was found to have a radioactivity of about 140.8 counts per minute due to 14C (t1/2=5730 years) as against 281.6 counts per minute for that of a freshly cut piece of wood. What is the age of the old sample of wood (in millennia, 1 millennium= 1000 years)?

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Solution

Age of the wood sample = t=1λlninitial activityfinal activity=t1/2ln 2ln281.6140.8 =5730ln 2ln2 = 5730=5730 years


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