# How do you calculate the half life of carbon 14?

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Michael Share
Nov 22, 2014

A quick way to calculate Half-Life is to use the expression:

${t}_{\frac{1}{2}}$ = $\frac{0.693}{\lambda}$

Where $\lambda$ is the decay constant and has the value of

1.21 x ${10}^{- 4} y {r}^{- 1}$

So t_((1)/(2))=(0.693)/((1 .21).(10^(-4))

${t}_{\frac{1}{2}}$ = 5.73 x ${10}^{3} y r$

Let me know if you would like the derivation of this.

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