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The half-lives of radioactive isotopes vary between a tiny fraction of a second, and more than 1015 years.

(see related link to a list of half-lifes) The following formula can be used to calculate half-life (t1/2): t1/2 = (t ln 1/2)/(ln mf / mi) t = time that has passed mf = the final or remaining mass of undecayed sample mi = the initial or original mass of undecayed sample (The fraction mf / mi is of course equivalent to the fraction of undecayed sample remaining, in case you are given the fraction remaining rather than specific masses.) Note: You can also use base-10 logarithms instead of natural logarithms.   Carbon14 with 6 protons and 8 neutrons, is unstable and decays by releasing a beta particle from its nucleus to become a stable isotope, Nitrogen14. That refers to an isotope that is unstable - the atoms will decay after a while.

Archaeologists use the exponential, radioactive decay of carbon 14 to estimate the death dates of organic material.

The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles.

Most people think that radioactive dating has proven the earth is billions of years old.

After all, textbooks, media, and museums glibly present ages of millions of years as fact.

Radiometric dating utilizes the decay rates of certain radioactive atoms to date rocks or artifacts.

Uniformitarian geologists consider this form of dating strong evidence that the Earth is billions of years old.

A related article on the age of the earth and geologic ages presented the current best known values for these dates: Ages.Yet few people know how radiometric dating works or bother to ask what assumptions drive the conclusions. This figure wasn’t established by radiometric dating of the earth itself. Radiohalos shouldn’t exist, according to conventional wisdom!Though they are very tiny, polonium radiohalos have a huge message that cannot be ignored.Uranium-thorium dating, for instance, can be used to date specimens up to about 500,000 years old (since the half-life of the U-Th decay is 75,000 years), but Rubidium-Strontium dating can be used to date specimens billions of years old (since the half-life of the Rb-Sr decay is 48.8 billion years).The following is a brief technical description of how scientists determine dates with radiometric schemes.

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