Carbon 14 isotope : One of three naturally occurring isotopes of carbon. The half life of the C14 isotope makes it idea for determining the difference between thermogenic methane (C14 absent) and biogenic gas
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}