In the triple-to-double coincidence ratio (TDCR) method of liquid scintillation counting, unaccounted or improperly accounted impurities can result in lower-than-expected or higher-than-expected recovered activities, depending on the counting efficiency of the nuclide of interest, the counting efficiency of the radionuclidic impurity, and the amount of impurity present. We describe these general dependences using a simple model. The trends predicted by the model are tested experimentally using a series of mixed 241Am/3H and 63Ni/3H sources. An impurity surface is derived to facilitate an intuitive grasp of impurity phenomena in TDCR.
Citation: Applied Radiation and Isotopes
Pub Type: Journals
triple-to-double coincidence ratio, TDCR, liquid scintillation, impurities, multilevel