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Chemistry
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 living plant contains approximately isotopic abundance 14C  atmospheric carbon dioxide. observed rate decay  14C from a living plant 15.3 disintegrations per minute

Jan 15th, 2015

15300 years is 2.67 times the half-life. 

The observed decay rate from a gram of living plant (sample is zero years old) is 15.3 disintegrations per minute. The observed rate from an older specimen will be less, because some of the carbon-14 will have decayed. 

The amount of C-14 remaining after 15300 years will be 1/2 raised to the power of 2.67 times the amount in a fresh sample. 
(1/2) ^ 2.67 = 15.3 * 0.157 = 2.40 disintegrations per minute.


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