Dating iron artefacts
We know of certain suspect artefacts found in the Giza pyramids that, had they survived, could have been used for Carbon 14 dating.For example, it is reported by Abu Szalt, a medieval Arab chronicler from Spain, that when the Caliph Ma'amoun entered the Great Pyramid for the first time in the 9th century and made his way to sarcophagus in the King's Chamber, 'the lid was forced opened, but nothing was discovered excepting some bones completely decayed by time.'.
The reason for this has to do with the concentration of C-14 in living materials as well as the half-life of the C-14 isotope.
They were mailed to Piazzi Smyth who recorded them in his diary, then returned to John Dixon who eventually arranged for the publications of articles and drawings of the relics for the science journal Nature and the popular London paper The Graphic . Astonishingly, although the discovery of the shafts of the Queen's Chamber by Waynman Dixon was reported by Flinders-Petrie in 1881 and by Dr. Here is, in fact, what actually happened to the relics after December 1872: exactly a century later, in 1972, a certain Mrs. Also at this 'corner' could be seen what appeared to be a long piece of wood whose shape and general appearance seemed to be the same as that of the shorter piece found by the Dixons in 1872 at the bottom of this shaft.
Elizabeth Porteous living in Hounslow near London, was reminded (apparently by the excitement generated by the Tutankhamun Exhibition at the time) that her great grandfather, John Dixon, had left in the family a cigar box with relics inside them found in the Great Pyramid which she had inherited in 1970, after the death of her father. Porteous then took the relics, still in the original cigar box, to the British Museum. It seems almost certain that this longer piece of wood (if wood it is) is contemporaneous with the construction of the Great Pyramid.
A 1 gram sample of carbon from living material shows an activity of about 14 disintegrations per minute. If an excavated sample of plant or animal origin from an archaeological site had a measured activity of 7 disintegrations per minute (dpm), the age of the sample could be fixed at about 5,730 years ± 40 years.
At 3.5 dpm, the age would be about 11,640 years and so on.
The University of Waikato's radiocarbon dating laboratory helped to identify the remains of a woman found in New South Wales 45 years after she went missing.