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ratio having remained the same over the preceding few thousand years.
To verify the accuracy of the method, several artefacts that were datable by other techniques were tested; the results of the testing were in reasonable agreement with the true ages of the objects.
Two different trends can be seen in the tree ring series.
This discrepancy, often called the de Vries effect, was resolved by the study of tree rings.However, experiments in which wood samples have been irradiated with neutrons indicate that the effect on concentrations in the neighbourhood of large cities are lower than the atmospheric average.