There are also trace amounts of the unstable radioisotope carbon-14 (14C) on Earth.
Libby and coworkers and has provided age determinations in archeology, geology, geophysics, and other branches of science.They find that the present activity of the artifact is 9.25 decays/s and that the mass of carbon in the artifact is 0.100 kg. I know the equation is ln((activity/lambda)/((mass of Carbon x r)/(m_a)).To find the age of the artifact, they will need to use the following constants: * r = 1.2 x 10^, * m_a = 2.32 x 10^ kg, * lambda = 1.21 x 10^ year^. When I plug in the #'s I don't get the right answer. I am a retired Nuclear Engineer and I don't recognize some of the values you mention.Suppose a bone from an ancient human contains 16.5% of the...The carbon-14 in a living organism is constant until the organism dies, after which carbon-14 decays with first-order kinetics and a half-life of 5730 years. This is a totally wild guess, but just using logic. If the half life is 5730 years then the full life is 11460 years. If 16.5% is left then 83.5% has gone, then my guess is 11.46 x 835 = 9569.4 years old. I am assuming that it breaks down at a constant rate over the total life.