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Performance of the Packard Tri-Carb® 2770TR/SL Liquid Scintillation Analyzer for 14C Dating

  • C. J. Passo (a1), Robert Anderson (a2), David Roberts (a1) and G. T. Cook (a2)

Abstract

We present results that demonstrate the potential of the Packard Tri-Carb® Model 2770TR/SL for radiocarbon dating. For 2 g of sample benzene, a stable background count rate of 0.307 cpm and a stable counting efficiency of 64.78% were determined using a 13–75 keV counting window. Changes to the mathematical routines for t-SIE (quench indicating parameter) calculation and a reduction in the activity of the external standard have enabled stability of the t-SIE to be achieved, and combined with the use of a suitable balance point counting window; all of these factors give the stability of performance required for 14C dating. Calculations based on the above parameters indicate that the limit of detection for 2 g samples, counted for 5000 min, is >48,900 yr bp. The great advantage of this system is that these data were acquired using inexpensive standard 7-mL low potassium borosilicate glass vials. Vial holders manufactured from BGO reduced the background to 0.15 cpm with a minimum effect on efficiency (64.46% for 13–75 keV). A similar calculation of the limit of detection gave >51,700 bp. The use of the BGO vial holders in other instruments employing time-resolved liquid scintillation counting (TR-LSC) (Models 2250CA and 2260XL) also brought about significant improvements in detection limits.

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References

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Alessio, M., Allegri, L., Bella, F. and Improta, S. 1976 Study of background characteristics by means of high efficiency liquid scintillation counter. Nuclear Instruments and Methods in Physics Research 137: 537543.
Calf, G. E. and Polach, H. A. 1974 Teflon vials for liquid scintillation counting of carbon-14 samples. In Stanley, P. E., and Scoggins, B., eds., Liquid Scintillation Counting: Recent Developments. New York, Academic Press: 224234.
Cook, G. T. 1995 Enhanced low level LSC performance for carbon-14 dating using a bismuth germanate (Bi4Ge3O12) quasi-active guard. Radioactivity & Radiochemistry 6: 1015.
Currie, L. A. 1968 Limits of detection and quantitative determination. Analytical Chemistry 40(3): 360365.
Gupta, S. K. and Polach, H. A. 1985 Radiocarbon Dating Practices at ANU. Canberra, Radiocarbon Laboratory, Research School of Pacific Studies, ANU: 173 p.
Haas, H. 1979 Specific problems with liquid scintillation counting of small benzene volumes and background count rate estimations. In Berger, R. and Suess, H. E., eds., Proceedings of the 9th International 14 C Conference . Berkeley, University of California Press: 246255.
Iwakura, T., Kasida, Y., Inoue, Y. and Tokunaga, N. 1979 A low-background liquid scintillation counter for measurement of low level tritium. In Behavior of Tritium in the Environment. IAEA Proceedings Series. IAEA, Vienna: 163–171.
Jiang, H., Luu, S., Fu, S., Zhang, W., Zhang, T., Ye, Y., Li, M., Fu, P., Wang, S., Peng, Ch. and Jiang, P. 1983 Model DYS low level liquid scintillation counter. In McQuarrie, S. A., Ediss, C., and Wiebe, L. I., eds., Advances in Scintillation Counting. Alberta, University of Alberta Press: 478493.
Noakes, J. E. 1977 Considerations for achieving low level radioactivity measurements with liquid scintillation counters. In Crook, M. A., and Johnson, P., eds., Liquid Scintillation Counting 4. London, Heyden: 189206.
Noakes, J. E. and Valenta, R. J. 1995 The role of Bi4Ge3O12 as an auxiliary scintillator for α, β, γ liquid scintillation counting and low-level counting. In Cook, G. T., Harkness, D. D., MacKenzie, A. B., Miller, B. F. and Scott, E. M., eds., Liquid Scintillation Spectrometry 1994. Tucson, Radiocarbon: 4358.
Punning, J. M. and Rajamae, R. 1977 Some possibilities for decreasing the background of liquid scintillation beta-ray counter. In Povinec, P. and Usačev, S., eds., Low Radioactivity Measurements and Applications. Bratislava, Slovenske Pedagogicke Nakladatelstvo: 169171.
Tamers, M. A. 1965 Routine carbon-14 dating using liquid scintillation techniques. In Chatters, R. M. and Olson, E. A., eds., Proceedings of the 6th International Conference on 14 C and 3 H Dating . Washington, DC, Clearinghouse for Federal Scientific and Technical Information: 5367.
Valenta, R. J. 1987 Reduced background scintillation counting. U.S. Patent 4,651,006.
van Cauter, S. 1986 Three dimension spectrum analysis: A new approach to reduce background of liquid scintillation counters. Packard Applications Bulletin 006.
von Pietig, F. and Scharpenseel, H. W. 1964 Altersbestimmung mit Flüssigkeits-scintillations-spectrometer, über die Wirksamkeit von Abschirmungsabnahmen. Atom-praxis 7: 13.
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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
  • URL: /core/journals/radiocarbon
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