Radiocarbon has been central to the construction of chronologies (back to 50.000 years ago) for over 50 years. The small amount of natural 14C can be measured by two methods - conventional (radio-metry) and AMS (mass spectrometry). Dates can now be calibrated into calendar years back to 26.000 years. This article provides an overview of the method. One special application, wiggle match dating, for a peat bog from The Netherlands is discussed