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Radium interference during radon measurements in water: comparison of one- and two-phase liquid scintillation counting Cover

Radium interference during radon measurements in water: comparison of one- and two-phase liquid scintillation counting

Archives of Industrial Hygiene and Toxicology
Volume 72 (2021): Issue 3 (September 2021)
By: Ivana Stojković,  Nataša Todorović and  Jovana Nikolov  
Open Access
|Sep 2021

Figures & Tables

Figure 1

CF dependence on PSA value across its range (samples prepared with the Ultima Gold AB cocktail and spiked with different 226Ra activities)

Figure 2

Accuracy of LSC methods for 222Rn measurement in non-spiked Niška Banja spa water. A0 – baseline activity measured 5 h after the samples were prepared and corrected for decay over this time

Figure 3

Generated spectra with the four scintillation cocktails in non-spiked spa water sample at baseline (red) and samples spiked with the lowest 226Ra activity concentration (79 Bq/L) on days 5 (green), 11 (brown), 31 (blue), and 64 (black). a) Mineral Oil, original ROI: 725–875, expanded ROI: 625–875 ch; b) Opti-Fluor O, original ROI: 760–910 ch, expanded ROI: 650–910 ch; c) Ultima Gold F, original ROI: 830–970 ch, expanded ROI: 730–970 ch; d) Ultima Gold AB, original ROI: 600–790 ch, expanded ROI: 430–790 ch; ROI – region of interest

222Rn activity in one-phase samples with Ultima Gold AB

Ultima Gold AB ROI: 430-790 ch Spiked with A(226Ra)=79.34 Bq/LSpiked with A(226Ra)=396.7 Bq/LSpiked with A(226Ra)=793.4 Bq/L
Days after sampling4.604.694.77
Theoretical A(222Rn) (Bq/L)*168(±5)166(±5)163(±5)
Measured A(222Rn) (Bq/L)216(±5)441(±11)723(±18)
Asampling (222Rn) (Bq/day** L) corrected on the498(±13)1031(±26)1718(±42)
2ndDays after sampling10.8510.9411.00
Theoretical A(222Rn) (Bq/L)54.2(±1.5)53.4(±1.5)52.6(±1.5)
Measured A(222Rn) (Bq/L)130(±3)442(±11)838(±21)
3rdDays after sampling31.131.231.2
Theoretical A(222Rn) (Bq/L)1.39(±0.04)1.37(±0.04)1.35(±0.04)
Measured A(222Rn) (Bq/L)88.16(±0.23)430(±11)863(±21)
4thDays after sampling63.963.964.0
Theoretical A(222Rn) (Bq/L)0.00365(±0.00010)0.00359(±0.00010)0.00354(±0.00010)
Measured A(222Rn) (Bq/L)87.6(±2.3)425(±11)842(±21)

222Rn activity in two-phase samples with Opti-Fluor O

Opti-Fluor O ROI: 650-910 chSpiked with A(226Ra)=79.34 Bq/LSpiked with A(226Ra)=396.7 Bq/LSpiked with A(226Ra)=793.4 Bq/L
Days after sampling5.155.195.23
Theoretical (Bq/L)* A(222Rn)203(±6)201(±5)200(±5)
Measured A(222Rn) (Bq/L)260(±7)366(±9)394(±10)
Aon (222the Rn) sampling (Bq/L) corrected day**661(±17)937(±24)1016(±26)
2ndDays after sampling11.4011.4411.48
Theoretical A(222Rn) (Bq/L)65.3(±1.8)64.8(±1.8)64.3(±1.7)
Measured A(222Rn) (Bq/L)140(±4)171(±5)206(±5)
3rdDays after sampling31.631.731.7
Theoretical A(222Rn) (Bq/L)1.67(±0.05)1.66(±0.05)1.64(±0.04)
Measured A(222Rn) (Bq/L)85.6(±2.4)68.0(±2.0)127(±3)
4thDays after sampling64.464.464.5
Theoretical A(222Rn) (Bq/L)0.00439(±0.00012)0.00436(±0.00012)0.00432(±0.00012)
Measured A(222Rn) (Bq/L)66.3(±1.9)67.9(±2.0)130(±4)

222Rn activity in two-phase samples with Mineral Oil Scintillator

Mineral Oil Scintillator ROI: 625-875 chSpiked with A(226Ra)=79.34 Bq/LSpiked with A(226Ra)=396.7 Bq/LSpiked with A(226Ra)=793.4 Bq/L
Days after sampling4.834.925
Theoretical A(222Rn) (Bq/L)*221(±4)218(±4)215(±4)
Measured A(222Rn) (Bq/L)286(±4)414(±6)441(±6)
A(222Rn) sampling (Bq/L) corrected day** on the688(±9)1010(±13)1092(±14)
2ndDays after sampling11.0811.1711.25
Theoretical A(222Rn) (Bq/L)71.2(±1.2)70.2(±1.2)69.1(±1.2)
Measured A(222Rn) (Bq/L)154.2(±2.3)204(±3)243(±3)
3rdDays after sampling31.331.431.5
Theoretical A(222Rn) (Bq/L)1.82(±0.03)1.79(±0.03)1.77(±0.03)
Measured A(222Rn) (Bq/L)93.0(±1.6)85.5(±1.5)161.7(±2.4)
4rdDays after sampling64.164.264.2
Theoretical A(222Rn) (Bq/L)0.00479(±0.00008)0.00472(±0.00008)0.00465(±0.00008)
Measured A(222Rn) (Bq/L)88.8(±1.5)74.9(±1.4)153.0(±2.3)

222Rn activity in two-phase samples with Ultima Gold F

Ultima Gold F ROI: 730-970 ch Spiked with A(226Ra)=79.34 Bq/LSpiked with A(226Ra)=396.7 Bq/LSpiked with A(226Ra)=793.4 Bq/L
Days after sampling5.045.085.13
Theoretical A(222Rn) (Bq/L)*183(±3)182(±3)180(±3)
Measured A(222Rn) (Bq/L)277(±5)387(±7)415(±7)
Asampling (222Rn) (Bq/day** L) corrected on the691(±12)973(±16)1051(±18)
2ndDays after sampling11.2911.3311.38
Theoretical A(222Rn) (Bq/L)59.0(±1.0)58.6(±1.0)58.1(±1.0)
Measured A(222Rn) (Bq/L)154.2(±2.8)203(±4)210(±4)
3rdDays after sampling31.531.531.6
Theoretical A(222Rn) (Bq/L)1.514(±0.027)1.503(±0.026)1.492(±0.026)
Measured A(222Rn) (Bq/L)89.9(±1.8)99.4(±1.9)113.6(±2.2)
4thDays after sampling64.364.364.4
Theoretical A(222Rn) (Bq/L)0.00397(±0.00007)0.00394(±0.00007)0.00391(±0.00007)
Measured A(222Rn) (Bq/L)87.1(±1.7)91.7(±1.8)100.4(±1.9)
DOI: https://doi.org/10.2478/aiht-2021-72-3480 | Journal eISSN: 1848-6312 | Journal ISSN: 0004-1254
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Language: English, Croatian, Slovenian
Page range: 205 - 215
Submitted on: Aug 1, 2020
|
Accepted on: Sep 1, 2021
|
Published on: Sep 28, 2021
Published by: Institute for Medical Research and Occupational Health
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
LSC,
one-phase/two-phase method,
Quantulus 1220TM,
222Rn in water,
226Ra in water-
Related subjects:
Medicine,
Basic medical science,
Basic medical science, other

© 2021 Ivana Stojković, Nataša Todorović, Jovana Nikolov, published by Institute for Medical Research and Occupational Health
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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