Trompetter, W.J.; Melhuish, W.H. 1993 Radiocarbon gas flow shield counters. Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 93/08 16 p.
Abstract: Shield counters are used to enable the cancellation of background radiation from sample counters. Six gas flow counters were built and tested for the gas counting system. The gas flow design was chosen as it offers a number of advantages over geiger tubes. They were found to be much more stable than the geiger tubes and just as sensitive. (auth)