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Optimization of Liquid Scintillation Counting Conditions With Two Kinds of Vials and Detector Shields for Low-Activity Radiocarbon Measurements

  • Gemma Rauret (a1), J S Mestres (a1) and J F Garcia (a1)

Abstract

Low-level radiocarbon measurements were made using two liquid scintillation (LS) counters, both with passive lead shields of approximately the same dimensions. The first one had a conventional background reduction with low-activity lead and “high-low” coincidence bias selection, and the second one had a spectrum analysis background reduction based on the different three-dimensional pulse-height signal of background and beta pulses.

The performance of commercial teflon-copper and glass vials were compared with both LS counters. Optimum counting conditions for the two detectors studied were also established. From results obtained, quality parameters and characteristics of quench curves were studied. Performances of each counter in the working conditions established were also compared.

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Copyright

References

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Calf, G E and Polach, H, 1974, Teflon vials for liquid scintillation counting of carbon-14, in Liquid scintillation counting: Recent developments: New York, Academic Press.
Kuc, T and Rozanski, K, 1978, A small volume teflon-copper vial for 14C low level liquid scintillation counting: Internatl Jour Applied Radiation Isotopes, v 30, p 452.
Operation manual TriCarb 2000 CA/LL: United Technologies, Packard Instruments, Zurich.
Polach, H, Gower, J, Kojola, H and Heinonen, A, 1983a, An ideal vial and cocktail for low level scintillation counting, in Advances in liquid scintillation counting: Alberta, Univ Alberta Press, p 508526.
Polach, H, Nurmi, J, Kojola, H and Soini, E, 1983b, Electronic optimization of scintillator counter for detection of low-level H-3 and C-14, in Advances in liquid scintillation counting: Alberta, Univ Alberta Press, p 420442.
Rauret, G, Mestres, J S and Garcia, J F, 1988, Effect of counting vials and scintillators on the detection of low-level 14C by liquid scintillation spectrometry: Nuclear Instruments & Methods, v B34, p 373376.
Stuiver, M and Polach, H A, 1977, Discussion: Reporting of 14C data: Radiocarbon, v 19, no. 3, p 355363.

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Optimization of Liquid Scintillation Counting Conditions With Two Kinds of Vials and Detector Shields for Low-Activity Radiocarbon Measurements

  • Gemma Rauret (a1), J S Mestres (a1) and J F Garcia (a1)

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