Uncertainty evaluation and analysis of gross α and gross β determination in new standard examination methods for drinking water

Yuhan XIE; Yuxin QIAN; Cen SHI; Liangliang YIN; Yanqin JI

doi:10.11889/j.1000-3436.2024-0056

Journals >Journal of Radiation Research and Radiation Processing >Volume 43 >Issue 1 >Page 010702 > Article

Journal of Radiation Research and Radiation Processing
Vol. 43, Issue 1, 010702 (2025)

Uncertainty evaluation and analysis of gross α and gross β determination in new standard examination methods for drinking water

Yuhan XIE, Yuxin QIAN, Cen SHI, Liangliang YIN^*, and Yanqin JI

Author Affiliations

Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China

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DOI: 10.11889/j.1000-3436.2024-0056 Cite this Article

Yuhan XIE, Yuxin QIAN, Cen SHI, Liangliang YIN, Yanqin JI. Uncertainty evaluation and analysis of gross α and gross β determination in new standard examination methods for drinking water[J]. Journal of Radiation Research and Radiation Processing, 2025, 43(1): 010702 Copy Citation Text

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Fig. 1. Casuse and effect diagram for uncertainty gross α and gross β analysis

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时间 / min Time	样品计数率 $n_{x}$ /10^-2 (counts·s^-1) Counting rate of sample	样品计数率 $n_{0}$ / 10^-3 (counts·s^-1) Counting rate of blank sample	A类相对标准不确定度 $u_{A}^{'}$ Type A evaluation of measurement relative standard uncertainty
100	0.800	0.667	0.164 0
200	0.675	0.417	0.122 0
300	0.644	0.389	0.102 0
400	0.650	0.417	0.088 2
500	0.657	0.333	0.076 9
600	0.664	0.333	0.079 8
700	0.643	0.357	0.066 2
800	0.652	0.354	0.061 4
900	0.669	0.333	0.056 8
1 000	0.672	0.333	0.053 7

Table 1. Counting rate and relative standard uncertainty at different detecting times

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次数 Times	坩埚质量 / g Crucible weight	坩埚+样品质量 / g Crucible+sample weight
1	170.676 3	172.276 8
2	170.675 8	172.276 4
3	170.676 6	172.277 2
4	170.676 0	172.277 0
5	170.676 2	172.276 6
6	170.676 3	172.276 9
平均值Average	170.676 2	172.276 8

Table 2. Six weighing results of the same sample

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不确定度分量 Uncertainty components	总α Gross α	总β Gross β
$u_{A}$	53.9	61.2
$u_{B, W}$	0.570	0.530
$u_{B, F}$	17.6	11.7
$u_{B, ε}$	20.4	19.4
$u_{B, m}$	1.85	1.73
$u_{B, V}$	5.79	5.41

Table 3. The percentage contribution of each uncertainty component to the uncertainty

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