• A Beta Test Comparison Between the New Packard 2260 XL and the LKB Quantulus and 1219 SM: Low-Level Radiocarbon and Tritium Determinations

      Kalin, Robert M. (Department of Geosciences, The University of Arizona, 1989-01-01)
      A Packard 2260 XL liquid scintillation counter was placed in an underground counting chamber to test performance under immense physical shielding. Results from the Packard 2260 XL are compared with two other counters under the same conditions, the LKB Quantulus, which has operated for two years in this laboratory, and the LKB 1219 SM, in use since January 1988.
    • An Inexpensive Upgrade of Older Liquid Scintillation Equipment for Radiocarbon Dating

      Steinke, David C.; Kalin, Robert M. (Department of Geosciences, The University of Arizona, 1989-01-01)
      We have replaced the original control electronics and added remote computer control to our Packard Instrument Tri-Carb 460C LSC. The total cost of materials to achieve this was <$1200; ca 200 hr were spent on design and programming, and installation was complete in 30 min. Our system has spectral analysis in 112 Key resolution utilizing the existing 4096 channel multi-channel analyzer, and user-friendly error checking for the mechanical systems. The computer collects spectral information, saves two channels of raw data, plots spectral information and produces data files of the standards, backgrounds and samples used in LOTUS to calculate the age of the sample.
    • Radiocarbon Dating with the Quantulus in an Underground Counting Laboratory: Performance and Background Sources

      Kalin, Robert M.; Long, Austin (Department of Geosciences, The University of Arizona, 1989-01-01)
      The University of Arizona Radiocarbon Laboratory purchased a state-of-the-art LKB Quantulus LSC and placed it into a new underground counting chamber. We have investigated the performance of the Quantulus in this setting comparing different vial types, checking background sources and experimenting with sample size.