Industrial revolution radiocarbon dating
This isotope has a long half-life, something over 5500 years.By the application of some very well thought-out techniques, Libby and his colleagues have actually not only identified the radiocarbon in nature, but have also made quantitative estimates thereof. Clearly, though, it is our ability to produce CO2 faster than the ocean and biosphere can absorb that it is the fundamental cause of the observed increase since pre-industrial times. Science 256 (1992), 74-79 ————————— Notes *How much they can be expected to absorb in the long run is an interesting and important scientific question, discussed in some detail in Chapter 3 of the IPCC report.The lab needs between 1-4 mg of charcoal or 2- 5 mg of uncharred wood or plant post-cleaning and pretreatment and complete removal of the lime mortar by acid digestion. You only need to include the confirmation code in the package.
Note: This is an update to an earlier post, which many found to be too technical.
If wood or charcoal found in the mortar was from “old” trees, then there will be “X” years bias in the result based on how old was the carbon in the trees.2 – Date the lime mortar directly It’s also possible to date lime mortar directly but not usually from items exposed to the elements because the mortar will react with rain or groundwater to uptake carbon in the form of dissolved inorganic carbonates.
Dating of lime mortar or plaster is very problematic and yields highly variable results even when the material has not been exposed to groundwater or rain water.
This, of course, covers the apparent periods of Biblical history, as well as more recent dates, and so bears directly upon the question of the Flood and other related events. Describing the Carbon 14 dating method which has resulted, Korff says: Cosmic ray neutrons, produced as secondary particles in the atmosphere by the original radiation, are captured by nitrogen nuclei to form the radioactive isotope of carbon, the isotope of mass 14.
Since that time, literally thousands of such measurements have been made, by workers in many different laboratories, and a great variety of archaeological and Recent geological datings have been obtained.