Comparative analysis of statistical measures to assess the capability of the γ-ray spectroscopy of radionuclides for interlaboratory comparison
10.3760/cma.j.cn112271-20241017-00402
- VernacularTitle:放射性核素γ能谱检测实验室间比对能力评定统计量的比较分析
- Author:
Shuying KONG
1
;
Qiang ZHOU
1
;
Fei TUO
1
;
Baolu YANG
1
;
Zeshu LI
1
;
Weihao QIN
1
Author Information
1. 中国疾病预防控制中心辐射防护与核安全医学所 辐射防护与核应急中国疾病预防控制中心重点实验室，北京 100088
- Publication Type:Journal Article
- Keywords:
Interlaboratory comparison;
γ-ray spectrum;
Capability verification;
Statistical measure for assessment
- From:
Chinese Journal of Radiological Medicine and Protection
2025;45(6):573-578
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore the applicability of critical statistical measures Z, Z′, Zeta ( ζ), and En value in comparative capability assessments by analyzing the data from nationwide radiological health technology institutions from 2020 to 2023, aiming to provide a reference for further improving China′s comparative assessment method for verifying the γ-ray spectroscopy capability of radionuclides. Methods:Based on the nationwide analysis and comparison of γ-ray spectroscopy of radionuclides conducted annually by the National Institute for Radiological Protection, China CDC, the deviations between laboratory result and reference values were determined using the above-mentioned four statistical measures. Finally, the qualification rates of the γ-ray spectroscopy result from relevant institutions were assessed and analyzed.Results:The result indicate that the qualification rates of the Z value exceeded 85%, which might be inaccurate in some cases since it ignored the limitation of uncertainty. In contrast, the Z′ value yielded more scientific and representative result because it considered the uncertainty of reference values, and the inter-laboratory comparison qualification rate is above 95%. In the case of low uncertainty of the γ-ray spectroscopy result, the Zeta ( ζ) or En ratio exhibited relatively high sensitivity and, accordingly, relatively low qualification rates, indicating that this ratio may not comprehensively reflect the interlaboratory comparison result. Conclusions:The Z, Z′, Zeta ( ζ), and En values demonstrate their own advantages and limitations in assessing the capability of the γ-ray spectroscopy of radionuclides. For comparison projects involving multiple laboratories and complex measurement conditions, such as the nationwide verification of the capabilities of the γ-ray spectroscopy of radionuclides, it is feasible to combine the Z′ value with the Zeta ( ζ) or En ratio, with the former and the latter used to determine the qualified and excellent capability result, respectively. This enables the comprehensive assessment of the measurement and analysis capabilities of the γ-ray spectroscopy laboratories of radiological health technology institutions in China.
