Uncertainty evaluation of γ-spectrum analysis of cesium-137 in seawater

Wei Jifang; Deng Chunmei; Wang Rongyuan; Wang Wei; Zhang Xinxing; Yao Haiyan; Zhang Mengmeng; Ding Kai

doi:10.3969/j.issn.0253-4193.2018.08.003

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Wei Jifang, Deng Chunmei, Wang Rongyuan, Wang Wei, Zhang Xinxing, Yao Haiyan, Zhang Mengmeng, Ding Kai. Uncertainty evaluation of γ-spectrum analysis of cesium-137 in seawater[J]. Haiyang Xuebao, 2018, 40(8): 20-28. doi: 10.3969/j.issn.0253-4193.2018.08.003

Citation:

Wei Jifang, Deng Chunmei, Wang Rongyuan, Wang Wei, Zhang Xinxing, Yao Haiyan, Zhang Mengmeng, Ding Kai. Uncertainty evaluation of γ-spectrum analysis of cesium-137 in seawater[J]. Haiyang Xuebao, 2018, 40(8): 20-28. doi: 10.3969/j.issn.0253-4193.2018.08.003

Citation:

Wei Jifang, Deng Chunmei, Wang Rongyuan, Wang Wei, Zhang Xinxing, Yao Haiyan, Zhang Mengmeng, Ding Kai. Uncertainty evaluation of γ-spectrum analysis of cesium-137 in seawater[J]. Haiyang Xuebao, 2018, 40(8): 20-28. doi: 10.3969/j.issn.0253-4193.2018.08.003

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Uncertainty evaluation of γ-spectrum analysis of cesium-137 in seawater

doi: 10.3969/j.issn.0253-4193.2018.08.003

North China Sea Environmental Monitoring Center, State Oceanic Administration, Qingdao 266033, China;Shandong Province Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation, Qingdao 266033, China

Received Date: 2017-08-15
Rev Recd Date: 2018-06-08

Abstract

Abstract

In order to evaluate the accuracy of the measurement results scientifically, uncertainty of γ-spectrum analysis of cesium-137 in seawater was studied. According to "Guidance on Evaluating the Uncertainty in Chemical Analysis", sources of the uncertainty were analyzed and quantified individually. On this basis, the combined related standard uncertainty was finally deduced. The results showed that the main causes of the uncertainty are the peak area of ¹³⁷Cs sample source, the activity of standard source, the sampling volume, the chemical recovery, the area of background in ¹³⁷Cs peak as well as the peak area of the ¹³⁷Cs standard source, among which the contribution from the peak area of the ¹³⁷Cs sample source is predominant. The combined related standard uncertainty is deduced to be 9.78% for a water sample with cesium-137 activity concentration of 1.28 mBq/L.
- seawater,
- ¹³⁷Cs,
- γ-spectrum,
- ICP-MS,
- uncertainty evaluation

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References(19)

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