Isotope dating problems
In the case of radiocarbon dating, the half-life of carbon 14 is 5,730 years.
This half life is a relatively small number, which means that carbon 14 dating is not particularly helpful for very recent deaths and deaths more than 50,000 years ago.
The multidisciplinary scope of many radiocarbon dating problems has required involvement of expertise from several fields of research and the problems can be grouped into a few broad categories: secular variations of radiocarbon, laboratory techniques, reference standards, sample contamination, calibration and data reporting, radiocarbon in oceans, fresh water, and soils, correction and evaluation of radiocarbon dates, dating of various materials, .
This abundance of problems has led to some negative criticism of either the whole or certain aspects of the method.
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.
The discovery of natural Willard Libby of the United States began with his recognition that a process that had produced radiocarbon in the laboratory was also going on in Earth’s upper atmosphere—namely, the bombardment of nitrogen by free neutrons.
Current active research on many problems by different laboratories, and especially the concerted efforts directed towards solving specific problems by groups of laboratories clearly indicate the healthy condition of the radiocarbon dating field.Invasion is probably not the proper word for a component that Libby calculated should be present only to the extent of about one atom in a trillion stable carbon atoms.So low is such a carbon-14 level that no one had detected natural carbon-14 until Libby, guided by his own predictions, set out specifically to measure it.His success initiated a series of measurements designed to answer two questions: Is the concentration of carbon-14 uniform throughout the plant and animal kingdoms?