Uncertainty Evaluation of the Determination of Gross Alpha and Gross Beta Radioactivity in Drinking Water

GU Xinyi; GU Jun; CHENG Xiaohong

doi:10.12338/j.issn.2096-9015.2023.0277

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GU Xinyi, GU Jun, CHENG Xiaohong. Uncertainty Evaluation of the Determination of Gross Alpha and Gross Beta Radioactivity in Drinking Water[J]. Metrology Science and Technology. doi: 10.12338/j.issn.2096-9015.2023.0277

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GU Xinyi, GU Jun, CHENG Xiaohong. Uncertainty Evaluation of the Determination of Gross Alpha and Gross Beta Radioactivity in Drinking Water[J]. Metrology Science and Technology. doi: 10.12338/j.issn.2096-9015.2023.0277

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Uncertainty Evaluation of the Determination of Gross Alpha and Gross Beta Radioactivity in Drinking Water

doi: 10.12338/j.issn.2096-9015.2023.0277

GU Xinyi^1
,,
GU Jun¹,
CHENG Xiaohong^{1, 2
,
,}

1.
Nantong Center for Disease Control and Prevention, Nantong 226007, China
2.
School of Public Health, Nantong University, Nantong 226011, China

Received Date: 2023-11-16
Accepted Date: 2024-01-23
Rev Recd Date: 2024-03-15

Available Online: 2024-03-20

Abstract

Abstract

This study evaluates the uncertainty in the determination of gross alpha and gross beta radioactivity in drinking water using the thick source method. Following the GB/T 5750.13-2023 "Standard Examination Methods for Drinking Water Part 13: Radioactivity Index," gross alpha and gross beta radioactivity in drinking water were measured. The measurement repeatability was considered as type A uncertainty, while factors such as count rate, residue mass, water sample volume, instrument detection efficiency, and recovery rate were considered as type B uncertainties. The measured concentrations of gross alpha and gross beta radioactivity were 0.66 Bq/L and 0.48 Bq/L, respectively, with relative combined standard uncertainties of 6.0% and 5.7%, and expanded uncertainties of 0.08 Bq/L and 0.06 Bq/L. The uncertainty introduced by the instrument's count rate (n) was the largest source of uncertainty and had the greatest influence. Measurement repeatability, the counting efficiency (ε) of the standard powder source, and the recovery rate of radioactivity (F) also had a significant impact. The total mass of the water sample residue (W), the mass of the residue used to prepare the sample source (m), and the volume (V) of the water sample had less influence.
- metrology,
- gross alpha radioactivity,
- gross beta radioactivity,
- drinking water,
- uncertainty

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References(30)

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