Use of Chlorofluorocarbons in Hydrology

Development of the chlorofluorocarbon (CFC) technique as a tool for dating groundwater has occurred over the past 20 years, and a number of research publications have documented its use in specific aquifers. This publication is intended to facilitate a comparative analysis of CFC and isotope techniques and a wider use of the CFC technique under appropriate conditions, by providing a description of its scientific basis, sampling and measurement methods, interpretation and limitations of data, and a variety of case studies.