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could you please tell me if this is the correct formula for radiometric date

t=1/constant 1n (1+d/p)

many thanks
ps this is a fantastic website

I think that you are after

t = age of the sample
D = number of atoms of the daughter isotope in the sample
P = number of atoms of the parent isotope in the sample
ë = decay constant of the parent isotope
ln = natural logarithm

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