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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)
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
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
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 1220,
Rn in water,
Ra 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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