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The wood in these rings once laid down remains unchanged during the life of the tree.This is very useful as a record of the radiocarbon concentration in the past.It is calculated on the assumption that the atmospheric radiocarbon concentration has always been the same as it was in 1950 and that the half-life of radiocarbon is 5568 years.For this purpose `present' refers to 1950 so you do not have to know the year in which the measurement was made.

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Using very old trees (such as the Bristlecone Pines in the western U. A.), it is possible to make measurements back to a few thousand years ago.Mobile revenue rose 82% to .1 million year-over-year.Mobile represented more than 92% of Meet Me’s total revenue in the second quarter.features, search, payment options and informational pages on Taylor & Francis Online will be unavailable during this scheduled release.Articles will remain available for view or download, where access rights already apply.