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by the gas proportional counter (GPC) technique. In order to improve the capability of low-level 14C measurement in our laboratory, we recently obtained a new liquid scintillation counter (LSC), Quan-tulus ™, which is placed in the same ground-floor room with the GPC system, where we can control environmental parameters. Active shielding in the Quantulus is in the form of a liquid scintillation anticoincidence guard, which completely surrounds the sample phototubes, within the lead shield. This active guard has an additional pair of 'guard' PMTs ('G' in Fig 1), which normally operate in anticoincidence with the sample PMTs, thus rejecting cosmic induced pulses. AbstractRadiocarbon dating laboratories using the liquid scintillation counting technique synthesise benzene by trimerization of acetylene over commercially ava Please note that Internet Explorer version 8.x will not be supported as of January 1,