Dear All Does someone could tell us how we can measure tritium as tracer in hidrologycal applications (non environmental), using a Camberra-Packard Tri-Carb 1500 Liquid Scintillation Analyzer. Besides, how we can know the minimum detectable limit in this kind of tests. Thanks in advance Wilmer Guevara [log in to unmask] Stable Isotope Laboratory and Radiotracer CEL/El Salvador _________________________________________________________ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com