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Method validation for the determination of fraction of modern (F14C) in wood samples using conventional method

Geochronometria
Volume 45 (2018): Issue 1 (January 2018)
By:
Open Access
|Feb 2018

Figures & Tables

Fig. 1

Detector background stability over time.
Detector background stability over time.

Fig. 2

z-score values for the ten replicates.
z-score values for the ten replicates.

The ten Fraction Modern (F14C) values obtained under repeatability condition_

Number of repetitionValue of F14C
10.224 ± 0.006
20.241 ± 0.007
30.237 ± 0.006
40.225 ± 0.006
50.242 ± 0.007
60.230 ± 0.006
70.236 ± 0.006
80.240 ± 0.007
90.230 ± 0.006
100.231 ± 0.006

Counting region optimization data for glass vial_

Counting regionBackground of blank sample (cpm)Standard (cpm)Efficiency (%)FOM (E2/B)
20–850.42 ± 0.041072 ± 2608571
15–1050.63 ± 0.041276 ± 2707778
10–950.93 ± 0.051407 ± 3776375

The four Fraction Modern (F14C) values obtained under reproducibility condition_

Number of repetitionValue of F14C
10.244 ± 0.008
20.235 ± 0.006
30.227 ± 0.006
40.242 ± 0.007

Validation parameters for the determination of Fraction Modern (F14C) by conventional method when counting 4g benzene for 300 minutes_

Validation parametersValue
Method Bias1.51%
RepeatabilityMean

Reference value = pMCreference/100 = 0.2305 ± 0.0002

0.23

Reference value = pMCreference/100 = 0.2305 ± 0.0002

σr0.01
rL0.02
CV2.70%
ReproducibilityMean0.24
σr0.01
RL0.02
CV3.30%
Limit of detectionLd (counts)2.98
Minimum Detectable ActivityMDA (dpm)0.003
Combined uncertaintyU(pMC)0.58

Reference values, Lab values and z-score values_

Sample CodeSample typeReference value (F14C)

Reference value = pMC reference/100

σtargetLab Value (F14C)σLabz-scoretSIE

tSIE =Transformed Spectral Index of the External Standard, the quench parameter

DBarley0.10300.01000.10380.02100.04682
UHumic acid0.23080.00020.22980.0083–0.12683
RMurex shell0.73340.00040.72100.0176–0.70685
IAEA-C2Travertine0.41140.00030.42170.01140.90682
IAEA-C7Oxalic acid0.49350.00120.48100.0130–0.96680
DOI: https://doi.org/10.1515/geochr-2015-0080 | Journal eISSN: 1897-1695
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Language: English
Page range: 68 - 73
Submitted on: Mar 16, 2015
Accepted on: Sep 29, 2017
Published on: Feb 21, 2018
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 times per year
Keywords:
radiocarbon,
method validation,
ISO 17025,
Eurachem Guide,
Fraction Modern
Related subjects:
Geosciences,
Geosciences, other

© 2018 Rana Baydoun, Omar El Samad, Bilal Nsouli, Ghassan Younes, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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