MEASUREMENT OF AMBIENT CARBON-14 BY USING THE GEL SUSPENSION COUNTING METHOD

2019 ◽  
Vol 184 (3-4) ◽  
pp. 405-408 ◽  
Author(s):  
Qianyuan Chen ◽  
Chongyang Chen ◽  
Weihai Zhuo
Keyword(s):  
Liquid Scintillation ◽  
Activity Concentration ◽  
Scintillation Counter ◽  
Practical Method ◽  
Counting Method ◽  
Carbon 14 ◽  
Routine Monitoring ◽  
Sampling Flow Rate ◽  
Limit Detection ◽  
Ambient Co2

Abstract For monitoring the ambient 14C, the CaCO3 suspension counting method was established in this work. In the preparation of CaCO3 powder, a two-stage sampler with 3 mol L−1 NaOH absorbent was designed to collect the ambient CO2 at a sampling flow rate of 1 L min−1, and then the CaCO3 was precipitated by adding saturated CaCl2 solution. By using 2 g of CaCO3 powder, 4 mL double-distilled water and 14 mL scintillation cocktail, the lower limit detection could reach 20.0 mBq m−3 by using a commercially available low background liquid scintillation counter. Co-comparison experiments showed that the activity concentration of 14C measured by the gel suspension counting method consisted well with the results of other three methods. It indicates that the CaCO3 suspension counting method is also a practical method for routine monitoring of ambient 14C.

MEASUREMENT OF THE POTENTIAL ALPHA ENERGY CONCENTRATION OF RADON PROGENY BY USING LIQUID SCINTILLATION COUNTING METHOD

2019 ◽  
Vol 184 (3-4) ◽  
pp. 440-443 ◽  
Author(s):  
Bin Feng ◽  
Quan Tang ◽  
Hui Zhang ◽  
Bo Chen ◽  
Shoukang Qiu ◽  
...  
Keyword(s):  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Scintillation Counter ◽  
Counting Efficiency ◽  
Scintillation Counting ◽  
Energy Concentration ◽  
Radon Progeny ◽  
Counting Method ◽  
Quenching Effect ◽  
Standard Source

Abstract For more accurate measurement of the potential alpha energy concentration (PAEC) of radon progeny by the liquid scintillation counting (LSC) method, its counting efficiency was studied in this work. A radon progeny standard source was used to provide different concentrations of radon progeny, and the progeny collected on the sampling filters were measured with a low background liquid scintillation counter. The result showed that the quenching effect could not be ignored, and the counting efficiency was estimated to be 86.12%. The co-comparison experiments showed that the PAECs of radon progeny measured by the LSC methods were in generally consistent with those of other three methods. It indicates that for more accurate measurements of PAEC of radon progeny by using the LSC method, the counting efficiency should be well determined.

scholarly journals Influence of natural radium contamination of barium chloride on the determination of radium isotopes in the water samples using α/β liquid scintillation spectrometry

Nukleonika ◽  
2016 ◽  
Vol 61 (4) ◽  
pp. 467-471
Author(s):  
Chau Nguyen ◽  
Magdalena Czechowska ◽  
Jakub Nowak ◽  
Paweł Jodłowski
Keyword(s):  
Water Samples ◽  
Liquid Scintillation ◽  
Activity Concentration ◽  
Barium Chloride ◽  
Counting Method ◽  
Optimum Amount ◽  
Radium Isotopes ◽  
Chemical Companies ◽  
Chemical Procedure

Abstract The determination of radium isotopes in drinking water by liquid scintillation technique requires some reagents that are used for separating radium from water samples. One of the main reagents is BaCl2·H2O. This paper presents the study of this compound and shows that barium chloride reagent is naturally contaminated with226Ra. The 226Ra activity concentration in BaCl2·H2O reagent produced by chemical companies from Poland and other countries is equal to a few dozen Bq/kg. Furthermore, 14 mL of 0.10 M BaCl2·H2O solution is the optimum amount which should be used for the chemical procedure. At the optimum amount of barium chloride and 2-hour measurement, the detection limit of 226Ra and 228Ra of the liquid scintillation counting method is equal to 5 and 30 mBq per sample, respectively.

scholarly journals University of Rome Carbon-14 Dates XV

Radiocarbon ◽  
1978 ◽  
Vol 20 (1) ◽  
pp. 68-78 ◽  
Author(s):  
M Alessio ◽  
L Allegri ◽  
F Bella ◽  
S Improta ◽  
G Belluomini ◽  
...  
Keyword(s):  
Figure Of Merit ◽  
Liquid Scintillation ◽  
Liquid Scintillator ◽  
Scintillation Counter ◽  
Liquid Scintillation Counter ◽  
Carbon 14 ◽  
Scintillation Method ◽  
Geologic Samples ◽  
University Of Rome ◽  
Italian Territory

This list includes ages measured from August 1974 to May 1976 using the benzene scintillation method. All archaeologic and geologic samples except Sahara Libico series, come from Italian territory. These datings were carried out partly with the liquid scintillation counter previously described (Alessio et al, 1973) and partly with a new liquid scintillation counter (Alessio et al, 1976b). Vials, 4.5ml in volume, described in Alessio et al, 1973. Mixture consists of 3.5ml of benzene from sample and 1ml of commercial liquid scintillator NE 216. The characteristics of new counter are: background 2.90 cpm and figure of merit

Liquid Scintillation Counter for Carbon-14 Employing Automatic Sample Alternation

1956 ◽  
Vol 28 (1) ◽  
pp. 110-112 ◽  
Author(s):  
A. J. Weinberger ◽  
J. B. Davidson ◽  
G. A. Ropp
Keyword(s):  
Liquid Scintillation ◽  
Scintillation Counter ◽  
Liquid Scintillation Counter ◽  
Carbon 14
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