half life is the only criteria used
to determine the age of a radioactive sample , when a radioactive sample decays
the half life is time taken for the ½ of the mass of the sample to disappear.
After every half , 50 % of the original mass of the sample disappeared while 50% of the sample
remained.
Normally
in any given substance slated for radioactive dating, there are atoms that are not decaying. The proportion
of the decaying isotopes to that of the
non –decaying isotopes is what is used
to determine the age of the sample.
The ratio of the mass of the
remaining isotopes to that of the original mass
is measured, and from here the number of time the sample decayed is
noted and then multiplied by the half-life of the radioactive isotope.
This give the approximate age of the age of
the sample, therefore it is from the size of the halflife that we predict the
age of the sample.
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