International Rn-222 in drinking water interlaboratory comparison

Kelleher, Kevin; Wong, Jennie; León-Vintró, Luis; Currivan, L.

doi:10.1016/j.apradiso.2017.01.036

Cited by 5 publications

(4 citation statements)

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“…For proper evaluation of 222 Rn concentrations in water, an intercomparison was carried out between Hirosaki University and the Office of Radiation Protection and Environmental Monitoring, Environmental Protection Agency, Ireland (EPA-ORM). EPA-ORM is a radon-in-water measurement technique accredited to ISO 17025:2005 [25]. The water chosen for the intercomparison was a private domestic groundwater supply located in the southeast of Ireland, with a 222 Rn concentration of approximately 750 Bq L −1 , and five samples were prepared and measured.…”

Section: Rn In Water Measurementmentioning

confidence: 99%

222Rn and 226Ra Concentrations in Spring Water and Their Dose Assessment Due to Ingestion Intake

Yamada

Hosoda

Tabe

et al. 2022

IJERPH

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222Rn and 226Ra concentrations of less than a few to several thousands of Bq L−1 have been observed in several underground bodies of water around the world. Although regulations for these concentrations in water have been implemented internationally, there are currently no regulations in place in Japan. However, concentrations that exceed these internationally recognized regulatory values have also been observed in Japan. In this study, concentrations in spring water in the northern part of Japan were measured and the effective dose from intake of the water was evaluated. 222Rn concentrations were measured using a liquid scintillation counter, and 226Ra concentrations were measured using a high purity germanium detector after chemical preparation. The measured 222Rn concentrations (=12.7 ± 6.1 Bq L−1) and 226Ra concentrations (<0.019–0.022 Bq L−1) did not exceed the reference values set by international and European/American organizations. A conservative estimate of the annual effective ingestion dose of 8 μSv for 222Rn and 226Ra obtained in this study is much smaller than the estimated overall annual effective dose of 2.2 mSv from natural radiation to the Japanese population. However, this dosage accounts for 8% of the WHO individual dosing criteria of 0.1 mSv/year for drinking water.

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Section: Rn In Water Measurementmentioning

confidence: 99%

222Rn and 226Ra Concentrations in Spring Water and Their Dose Assessment Due to Ingestion Intake

Yamada

Hosoda

Tabe

et al. 2022

IJERPH

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“…(Jobbágy et al, 2017), the values detected may vary from one place to another one. Hence, Kelleher et al (2017) pointed out that such inter-laboratory variation in sampling and analytical techniques could be minimized and controlled through participation in the inter-laboratory quality control programmes for water radon analysis. Eikenberg et al (2014) suggested that consistency of measurement could be achieved by checking interference caused by radon progeny like 228 Ra.…”

Section: Influencing Factorsmentioning

confidence: 99%

Factors Influencing Radon (<sup>222</sup>Ra) Levels of Water: An International Comparison

Nagaraja¹,

Sukumar²,

Dhanalakshmi³

et al. 2019

GEP

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Radon levels were measured in 59 water samples of rural and urban places of Bangalore city following procedures of standardized techniques. Though water level of radon above 100 Bqll −1 of WHO is ascribed to causes of lung cancer and leukaemia, very low levels were found in different urban and rural places, but urban-rural gradient observed significantly higher urban levels than rural levels. Correlation between depth of water sampled and radon levels estimated indicates that in urban places, lower water depth is related to higher radon levels, while it is vice versa in rural. It is due to more water use for rural agriculture and more urban water pollution and granite quarries. In comparison to other countries, it is observed that water radon levels are at wide ranges from the lowest to the highest estimated with different techniques and differ due to types of water, soil, rocks and sampling season.

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“…Alongside the SCC, the Canadian Association for Laboratory Accreditation (CALA) and the Centre d’expertise en analyse environmentale du Québec in Quebec provide accreditation services to ISO/IEC 17025 and therefore require enrollment in PT. PT is regularly used internationally to evaluate the efficacy of drinking water testing within a region ( Noble and Nikiforuk, 1996 ; Kelleher et al, 2017 ; Cao and Yang, 2020 ; Molina-Castro et al, 2021 ). Previous literature from CALA has also led to the evaluation of accredited and non-accredited environmental laboratories, where accredited laboratories were found to be more likely to show accurate results in PT ( Morris and Macey, 2004 ; Middlebrook, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

“…Awareness of the efficacy of PT programs as a means of monitoring drinking water systems is lacking ( Kelleher et al, 2017 ; Molina-Castro et al, 2021 ). Studies evaluating the efficacy of PT program implementation in drinking water do not mention the specificity and complexity of infectious pathogen testing.…”

Section: Introductionmentioning

confidence: 99%

Improving drinking water quality through proficiency testing—the impact of testing method and accreditation status on Escherichia coli detection by Canadian environmental testing laboratories

Sreya,

Alam,

Daula

et al. 2024

Front. Mol. Biosci.

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Water quality testing is crucial for protecting public health, especially considering the number of boil water advisories annually issued across Canada that impact daily life for residents in affected areas. To overcome these challenges, the development of drinking water safety plans and accessibility to regular testing using simple, rapid, and accurate materials are necessary. However, the significance of monitoring the accuracy of environmental microbiology testing laboratories cannot be overlooked. Participation in external quality assessment programs, such as those that include proficiency testing (PT), is a necessary risk management resource that ensures the effectiveness of these testing processes. Proficiency Testing Canada (PTC), in collaboration with the Canadian Microbiological Proficiency Testing (CMPT) program based at the University of British Columbia, have implemented a drinking-water microbiology PT program since 1996. Both PTC and CMPT are ISO/IEC 17043:2010-accredited EQA providers. The drinking water program provided PT challenges to subscribing testing laboratories twice per year. Each challenge consisted of four samples containing unknown concentrations of Escherichia coli (E. coli) and Enterobacter spp. Results from participants were assessed for accuracy based on the method of testing. This cross-sectional study evaluated 150 rural and metropolitan testing sites across Canada between 2016 and 2022. Multivariable logistic regression analysis was conducted to examine the impact of different testing methods and laboratory accreditation status on the proficiency scores. This approach enabled us to assess the association between multiple independent variables and the likelihood of achieving specific proficiency scores, providing insights into how testing methods and accreditation status affect overall performance. After adjusting for rural residence, testing time, and survey year, the membrane filtration method was positively associated with the likelihood of scoring satisfactory results compared to the enzyme-substrate method (OR: 1.75; CI: 1.37–2.24), as well as accreditation status (OR: 1.47; CI: 1.16–1.85). The potential for improvement in environmental laboratory testing performance through the implementation of regulated PT in drinking water safety plans is proposed, along with the need for reliable testing methods applicable to rapid drinking water microbiology testing.

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International Rn-222 in drinking water interlaboratory comparison

Cited by 5 publications

References 1 publication

222Rn and 226Ra Concentrations in Spring Water and Their Dose Assessment Due to Ingestion Intake

222Rn and 226Ra Concentrations in Spring Water and Their Dose Assessment Due to Ingestion Intake

Factors Influencing Radon (<sup>222</sup>Ra) Levels of Water: An International Comparison

Improving drinking water quality through proficiency testing—the impact of testing method and accreditation status on Escherichia coli detection by Canadian environmental testing laboratories

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International Rn-222 in drinking water interlaboratory comparison

Cited by 5 publications

References 1 publication

222Rn and 226Ra Concentrations in Spring Water and Their Dose Assessment Due to Ingestion Intake

222Rn and 226Ra Concentrations in Spring Water and Their Dose Assessment Due to Ingestion Intake

Factors Influencing Radon (&lt;sup&gt;222&lt;/sup&gt;Ra) Levels of Water: An International Comparison

Improving drinking water quality through proficiency testing—the impact of testing method and accreditation status on Escherichia coli detection by Canadian environmental testing laboratories

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Factors Influencing Radon (<sup>222</sup>Ra) Levels of Water: An International Comparison