To analyze how the frequency and significance of cranial modification changed over time, skeletal samples were collected from two mortuary sites in the Collagua region and submitted
for radiocarbon measurement.
Not exact matches
Radiocarbon dating of the charcoal samples provided an age
for the shells;
measurements of oxygen isotopes found in the clam fossils gave sea surface temperatures every 2 to 4 weeks during the clam's life.
Continuous series of tree - ring dated wood samples have been obtained
for roughly the past 10,000 years which give the approximate correct
radiocarbon age, demonstrating the general validity of the conventional
radiocarbon dating technique.Several long tree - ring chronologies have been constructed specifically
for use in calibrating the
radiocarbon time scale.Some may have mistaken this to mean that the sample had been dated to 20,000
radiocarbon years.The second characteristic of the
measurement of
radiocarbon is that it is easy to contaminate a sample which contains very little
radiocarbon with enough
radiocarbon from the research environment to give it an apparent
radiocarbon age which is much less than its actual
radiocarbon age.
or you can read the following excerpts and see Sequential
radiocarbon measurement of bulk peat
for high - precision dating of tsunami deposits
Nevertheless, this first attempt to estimate urban - scale CO2ff from atmospheric
radiocarbon measurements shows that CO2ff can be used to verify and improve emission inventories
for many poorly known anthropogenic species, separate biospheric CO2, and indicates the potential to constrain CO2ff emissions if transport uncertainties are reduced.
The red curve on the y - axis is centred on the 14C age derived by
measurement (the
radiocarbon or 14C determination) and shows the likelihood
for that determination as a function of true 14C age.