Background characterization of an ultra-low background liquid scintillation counter

Erchinger, Jennifer Lynn; Orrell, J. L.; Aalseth, Craig E.; Bernacki, Bruce E.; Douglas, Matthew; Fuller, Erin S.; Keillor, Martin E.; Marianno, Craig M.; Morley, Shannon M.; Mullen, Crystal A.; Panisko, Mark E.; Warren, G.

doi:10.1016/j.apradiso.2017.01.032

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…lead shield, etc.) and electric noise of the measurement system 19 . With increments of the sample intake, 90 Sr concentration is increased in the analyte and the DL can be improved.…”

Section: Discussionmentioning

confidence: 99%

Accurate and precise determination of 90Sr at femtogram level in IAEA proficiency test using Thermal Ionization Mass Spectrometry

Kávási

Sahoo

Arae

et al. 2019

Sci Rep

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A novel method for the determination of ultra-trace level 90Sr has been recently developed applying thermal ionization mass spectrometry (TIMS). The method includes the chemical separation of Zr (isobaric interference of 90Zr) from the samples followed by determination of 90Sr/88Sr abundance sensitivity (2.1 × 10−10). The analytical performance of this method was assessed in the IAEA-TEL 2017-3 worldwide open proficiency test. For 90Sr determination, tap water and milk powder samples were distributed amongst the participant laboratories with reference values of 11.2 ± 0.3 Bq kg−1 (2.2 ± 0.1 fg g−1) and 99.9 ± 5.0 Bq kg−1 (19.5 ± 1.0 fg g−1), respectively. The stable Sr concentrations were 39.4 ± 0.9 ng g−1 and 2.5 ± 0.1 µg g−1 while the 90Sr/88Sr isotope ratios were 6.47 ± 0.17 × 10−8 and 9.04 ± 0.45 × 10−9 in the tap water and milk powder samples, respectively. For TIMS measurement, 50 mL water and 1 g milk powder samples were taken for analysis. This TIMS method demonstrated an impressive accuracy (relative bias of 4.2% and −2.1%, respectively) and precision (relative combined uncertainty of 4.1% and 7.6%, respectively) when compared with radiometric techniques. For the first time in the history of inorganic mass-spectrometry, 90Sr analysis using a TIMS instrument is confirmed by an independent proficiency test.

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“…lead shield, etc.) and electric noise of the measurement system 19 . With increments of the sample intake, 90 Sr concentration is increased in the analyte and the DL can be improved.…”

Section: Discussionmentioning

confidence: 99%

Accurate and precise determination of 90Sr at femtogram level in IAEA proficiency test using Thermal Ionization Mass Spectrometry

Kávási

Sahoo

Arae

et al. 2019

Sci Rep

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“…Since the amount of tritium-in T2O or HTO form-is present in the tap water samples at very low levels, it is, therefore, necessary to use a highly sensitive LSC with the lowest minimum detectable activity (MDA, Bq/L) for measuring tritium. Numerous recent studies have been especially focused on optimizing the counting performance for tritium analysis (Feng et al, 2020;Arun et al, 2019;Erchinger et al, 2017;Grahek et al, 2016). The results revealed that the main parameters affecting MDA were the volume ratios between the water samples and the scintillation cocktails, types of cocktails, types of LSC vials, and counting time.…”

Section: Introductionmentioning

confidence: 99%

Low-Level Tritium Measurement in Tap Water in Bangkok Area and Annual Dose Estimation

Sudprasert

Phattanasub²,

Srimork³

et al. 2022

Environ. Nat. Resour. J.

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Monitoring of tritium concentration in tap water is an essential tool to determine the effective dose received from tap water. Liquid scintillation counting (LSC) is a widely used technique for determining tritium in water. Due to the very low activity of tritium in tap water, its detection requires a high-efficiency LSC with the lowest minimum detectable activity (MDA). Low-level tritium analysis in tap water were performed in two LSC models using conventional distillation techniques. The optimal conditions with the lowest MDAs were applied to determine the tritium concentration in the tap water distributed from two main sources located in the Bangkok metropolitan region: Bang Khen and Maha Sawat water treatment plants (WTPs). Twenty-six tap water samples were collected from petrol stations located around both water treatment plants. The results revealed that the amount of tritium in the tap water around the Bangkhen WTP was between 1.88-2.63 Bq/L with an average of 2.28±0.28 Bq/L, whereas those from the Maha Sawat WTP were between 2.01-2.69 Bq/L with an average of 2.44±0.26 Bq/L, which are far below the World Health Organization’s (WHO) guideline limit (10,000 Bq/L) for drinking water. The annual effective dose (AED) for infants, children and adults obtained from tap water samples around the Bangkhen WTP were 0.010, 0.014, and 0.030 µSv/year, respectively, and those from the Maha Sawat WTP were 0.011, 0.015, and 0.032 µSv/year, respectively, which are far below the WHO’s guideline limit (100 µSv/year).

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Identification of background limitations to ultra-sensitive LSC counting through ICP-MS assay of LSC cocktails

Vacri

Arnquist

Back

et al. 2022

J Radioanal Nucl Chem

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Background characterization of an ultra-low background liquid scintillation counter

Cited by 10 publications

References 5 publications

Accurate and precise determination of 90Sr at femtogram level in IAEA proficiency test using Thermal Ionization Mass Spectrometry

Accurate and precise determination of 90Sr at femtogram level in IAEA proficiency test using Thermal Ionization Mass Spectrometry

Low-Level Tritium Measurement in Tap Water in Bangkok Area and Annual Dose Estimation

Identification of background limitations to ultra-sensitive LSC counting through ICP-MS assay of LSC cocktails

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