LKB-Wallace RackBeta 1217 liquid scintillation counter serial no. 170982, adapted with more shielding and selected photomultiplier for low-level counting, manufactured by Wallace Oy, 20101 Turku, Finland, 1984, with specimens of sample racks, code plugs and sample bottles, used at the British Museum, Department of Scientific Research, for carbon-14 dating of organic materials (radioactive source removed). LKB-Wallace RackBeta 1217 liquid scintillation counter serial no. 170982 1984