Radiocarbon dating cremated bone
There is no charge for the pre-screening, however please see our for dating at guidelines for selecting bones We remove the mineral component of the bones because it is not reliable for dating.We then purify the remaining material to concentrate the collagen and remove as much soil contamination as possible following the procedure given in Brown et al.
If the % carbon is unknown then please contact us about conducting testing a sample first.We pre-screen bones for nitrogen content which allows us to predict whether a bone has sufficient collagen preservation about 85% of the time based on research by Oxford Radiocarbon Accelerator Unit.Bones with low nitrogen content will not be processed to collagen.In the late 1990s, it was demonstrated that reliable radiocarbon dates could be obtained directly from cremated bone.Many 14C laboratories have since used a protocol for pretreating cremated (calcined) bones that consists of consecutive treatments with bleach and acetic acid to remove organic matter and extraneous or diagenetic carbonate, respectively.In most instances, the bleach used is sodium hypochlorite, although in recent years the Oxford Radiocarbon Accelerator Unit (ORAU) has used acidified sodium chlorite instead.
However, properly calcined (white) bones should not contain any organic material; hence, the bleach treatment is potentially unnecessary.
Bone, antler, and teeth Our ability to radiocarbon date bone and other collagen containing samples such as antler, horn, and teeth (dentine) depends upon the preservation of the protein component of the bones (mostly collagen).
The preservation depends largely on the burial conditions (soil acidity, temperature, moisture etc.).
The large number of burials made in this time showed that the cemetery was a collective one, probably used by the inhabitats of the numerous farms that were dotted around the surrounding landscape.
Since the excavation was published, the site has also become an important reference point for archaeologists dating other sites.
File=The dates on cremations I gained were interesting in various aspects – the range of the dates, the sites, and, the area of interest which has only rarely been the subject of radiocarbon dating.