Bones are first mechanically cleaned (brushed with water), then ground to a grain size of about 0.2 mm.
The bone-powder is treated with 8% HCl, finally the sample is washed to p H=3 and the collagen extracted by hot water at 90 C during 24 hours at p H=3 by the same procedure as suggested by Longin.
Except for slight isotopic fractionation, which can be corrected, the specific activity of Charcoal, wood, seeds, bone, ivory, horn, humus, peat, leaves, resin, lichen, tissue, hair, secondary carbonate (e.g., travertine and speleothem), mollusc shells, shells, egg, soil and sediment, as well as groundwater and ice can be dated, in the age range of 100 to 40,000 years.
Samples are treated according to the Longin method to extract the collagen fraction of the bone.
1 Bayliss et al 2004)" alt="Figure 1: Pathways of production and distribution of 14C (fig.
1 Bayliss et al 2004)" src=" width="350" height="272" /C) is a naturally occurring isotope of carbon that is formed in the upper atmosphere when cosmic radiation interacts with nitrogen atoms (Figure 1).
Radiocarbon then enters animals as they consume the plants (figure 2).Once produced, it mixes rapidly across each of the hemispheres, quickly entering the terrestrial food chain through photosynthesis, with the result that the C is an unstable (radioactive) isotope, with a half-life of 5730±40 years, the proportion of radiocarbon in the deceased organism decreases over time. It is by measuring the amount of radiocarbon that remains that scientists are able to estimate the amount of time that has passed since the organism’s death. The most well-known of all the radiometric dating methods is radiocarbon dating.Although many people think radiocarbon is used to date rocks, it is limited to dating things that contain carbon and were once alive (fossils).