Changes

In order to calibrate radiometric dating methods, the methods need to be checked for accuracy against items with independently-known dates.

In order to calibrate radiometric dating methods, the methods need to be checked for accuracy against items with independently-known dates.

Carbon dating, with its much lower maximum theoretical range, is often used for dating items only hundreds and thousands of years old, so can be calibrated in its lower ranges by comparing results with artifacts who's ages are known from historical records.

Carbon dating, with its much lower maximum theoretical range, is often used for dating items only hundreds and thousands of years old, so can be calibrated in its lower ranges by comparing results with artifacts whose ages are known from historical records.

Scientists have also attempted to extend the calibration range by comparing results to timber which has its age calculated by [[dendrochronology]], but this has also been questioned because carbon dating is used to assist with working out dendrochronological ages.

Scientists have also attempted to extend the calibration range by comparing results to timber which has its age calculated by [[dendrochronology]], but this has also been questioned because carbon dating is used to assist with working out dendrochronological ages.