# Equation for carbon dating

By looking at the ratio of **carbon**-12 to **carbon**-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely. So, if you had a fossil that had 10 percent **carbon**-14 compared to a living sample, then that fossil would be: t = [ ln (0.10) / (-0.693) ] x 5,700 years t = [ (-2.303) / (-0.693) ] x 5,700 years t = [ 3.323 ] x 5,700 years Because the half-life of **carbon**-14 is 5,700 years, it is only reliable for **dating** objects up to about 60,000 years old.However, the principle of *carbon*-14 *dating* applies to other isotopes as well.Thereafter, the concentration (fraction) of 14C declines at a fixed exponential rate due to the radioactive decay of 14C. ) Comparing the remaining 14C fraction of a sample to that expected from atmospheric 14C allows us to estimate the age of the sample.Raw (i.e., uncalibrated) radiocarbon ages are usually reported in radiocarbon years "Before Present" (BP), with "present" defined as CE 1950.Now, take the logarithm of both sides to get $$ -0.693 = -5700k, $$ from which we can derive $$ k \approx 1.22 \cdot 10^.$$ So either the answer is that ridiculously big number (9.17e7) or 30,476 years, being calculated with the **equation** I provided and the first **equation** in your answer, respectively. Anything that dies after the 1940s, when Nuclear bombs, nuclear reactors and open-air nuclear tests started changing things, will be harder to date precisely.

After 5600 years, if we start with a gram, we end up with half a gram. Libby invented **carbon** **dating** for which he received the Nobel Prize in chemistry in 1960.The halflife of **carbon** 14 is 5730 ± 30 years, and the method of **dating** lies in trying to determine how much **carbon** 14 (the radioactive isotope of **carbon**) is present in the artifact and comparing it to levels currently present in the atmosphere.This rather complex formula shows you how to solve this puzzle using accepted scientific methods. As soon as a living organism dies, it stops taking in new **carbon**.