title: Digital coincidence counting (DCC) and its use in the corrections for out-of-channel gamma events in 4pi beta-gamma coincidence counting.
abstract: The digital coincidence counting system developed by NPL and ANSTO is briefly described along with its benefits in the data collection and processing for the 4pi beta-gamma coincidence counting technique of radionuclide standardization. One of these benefits is the automatic detection of and correction for out-of-channel coincidences in the Computer Discrimination method. Where the criteria for the use of the Cox-Isham/Smith correction formulae for dead times and resolving times are not met, a generalized approximation based on the work of Campion is suggested.
authors.affiliation: Centre for Ionising Radiation Metrology, National Physical Laboratory, Teddington, Middlesex, UK. john.keightley@npl.co.uk
authors.forename: J D
authors.initials: JD
authors.lastname: Keightle
authors.forename: G C
authors.initials: GC
authors.lastname: Watt