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

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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Optimisation of liquid scintillation counting conditions to determine low activity levels of tritium and radiostrontium in aqueous solution

The Analyst ◽

10.1039/an9901501097 ◽

1990 ◽

Vol 115 (8) ◽

pp. 1097 ◽

Cited By ~ 9

Author(s):

Gemma Rauret ◽

Joan S. Mestres ◽

Merc� Ribera ◽

Pilar Rajadel

Keyword(s):

Aqueous Solution ◽

Liquid Scintillation Counting ◽

Liquid Scintillation ◽

Scintillation Counting ◽

Activity Levels ◽

Low Activity

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Problems and Methods of Dating Low-Activity Samples by Liquid Scintillation Counting

Radiocarbon ◽

10.1017/s0033822200060409 ◽

1993 ◽

Vol 35 (3) ◽

pp. 393-398 ◽

Cited By ~ 22

Author(s):

Kh. A. Arslanov ◽

T. V. Tertychnaya ◽

S. B. Chernov

Keyword(s):

Memory Effect ◽

Liquid Scintillation Counting ◽

Liquid Scintillation ◽

Complete Removal ◽

Scintillation Counting ◽

Scintillation Method ◽

Synthesis Procedure ◽

Former Ussr ◽

New Procedures ◽

Low Activity

The important problem of contamination of old samples by younger 14C necessitates treatment of organic and carbonate samples to ensure more complete removal of contaminating carbon. Here we present studies of chemical procedures for the liquid scintillation method of 14C dating undertaken since 1960 in the former USSR. We discuss new procedures such as lithium carbide synthesis from charred organic samples and benzene synthesis on a V2O5·Al2O3·SiO2 catalyst, as well as memory effect in the carbide synthesis procedure and characteristics of two homemade counters.

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Time-Resolved Liquid Scintillation Counting

Radiocarbon ◽

10.1017/s0033822200013047 ◽

1990 ◽

Vol 32 (3) ◽

pp. 381-386 ◽

Cited By ~ 2

Author(s):

Michael Kessler

Keyword(s):

Spectrum Analysis ◽

Liquid Scintillation ◽

Scintillation Counter ◽

Counting Efficiency ◽

General Purpose ◽

Scintillation Counting ◽

Age Dating ◽

Time Resolved ◽

Low Level ◽

Special Time

Historically, scientists who perform low-level measurements of 14C for age dating, and 3H2O for environmental contamination, have purchased or constructed highly specialized instruments to quantitate low-level radionuclides using a general-purpose liquid-scintillation analyzer (LSA). The LSA uses special time-resolved 3-D spectrum analysis (TR-LSC) to reduce background without substantially affecting sample counting efficiency. This technique, in combination with a special slow fluor scintillating plastic, further reduces the minimal detectable limit for the TR-LSC liquid scintillation counter.

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