Uncertainty evaluation of the measurement of gross beta activity in the groundwater of a nuclear power plant

Juntao ZHENG; Di WU; Jin XU; Guopeng XU; Zhihao ZHENG; Feng CHENG

doi:10.11889/j.1000-3436.2024-0079

Journal of Radiation Research and Radiation Processing, Volume. 43, Issue 3, 030501-1(2025)

Uncertainty evaluation of the measurement of gross beta activity in the groundwater of a nuclear power plant

Juntao ZHENG¹, Di WU², Jin XU³, Guopeng XU³, Zhihao ZHENG⁴, and Feng CHENG^1、*

Author Affiliations

¹Yangjiang Nuclear Power Co., Ltd., Yangjiang, Yangjiang 529941, China

²Daya Bay Nuclear Power Operations and Management Co. Ltd., Shenzhen 518124, China

³CGN Huizhou Nuclear Power Co., Ltd., Huizhou 516353, China

⁴Huizhou Ruihui Labor Property Management Co., Ltd., Huizhou 516005, China

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Figures & Tables(3)

Fig. 1. Causal relationship of uncertainty component of gross beta activity measurement in groundwater

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Table 1. Independent measurement results of gross beta activity sampling
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Table 1. Independent measurement results of gross beta activity sampling
No. $C_{β} / (B q \cdot L^{- 1})$ No. $C_{β} / (B q \cdot L^{- 1})$
$\bar{C_{β}} / (B q \cdot L^{- 1}) = 0.818$
1 0.812 7 0.821
2 0.795 8 0.791
3 0.820 9 0.782
4 0.798 10 0.864
5 0.834 11 0.832
6 0.841 12 0.829

Table 2. Summary table of each uncertainty component

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Table 2. Summary table of each uncertainty component

序号 No.	不确定度分量 Uncertainty component	相对标准不确定度 / % Relative standard uncertainty
1	抽样引入的不确定度 $u_{r e l} (S)$ Uncertainty introduced by sampling $u_{r e l} (S)$	2.91
2	样品测量计数引入的不确定度 $u_{r e l} (R)$ Uncertainty introduced by sample counting rate $u_{r e l} (R)$	2.66
3	标准物质净计数率引入的不确定度 $u_{r e l} (R_{s 0})$ Uncertainty introduced by net count rate of standard material $u_{r e l} (R_{s 0})$	1.34
4	标准物质比活度引入的不确定度 $u_{r e l} (β_{s})$ Uncertainty introduced by specific activity of standard material $u_{r e l} (β_{s})$	2.75
5	样品取样量引入的不确定度 $u_{r e l} (V)$ Uncertainty introduced by the amount of sample taken $u_{r e l} (V)$	0.46
6	残渣总质量引入的不确定度 $u_{r e l} (M)$ Uncertainty introduced by total mass of residue $u_{r e l} (M)$	0.06
7	体积校正系数1.02引入的不确定度 $u_{r e l} (1.02)$ Uncertainty introduced by volume correction coefficient 1.02 $u_{r e l} (1.02)$	0.06
8	样品回收率引入的不确定度 $u_{r e l} (F)$ Uncertainty introduced by sample recovery rate $u_{r e l} (F)$	3.33
9	铺样均匀性引入的不确定度 $u_{r e l} (f_{P a v i n g s a m p l e})$ Uncertainty introduced by sample uniformity $u_{r e l} (f_{P a v i n g s a m p l e})$	2.24
10	α射线对β道串道比引入的不确定度 $u_{r e l} (f_{C r o s s t a l k r a t i o})$ Uncertainty introduced by crosstalk ratio of α-ray cross-talk in the β channel $u_{r e l} (f_{C r o s s t a l k r a t i o})$	5.77
11	数据修约引入的不确定度 $u_{r e l} (β_{D a t a r o u n d i n g})$ Uncertainty introduced by data rounding $u_{r e l} (β_{D a t a r o u n d i n g})$	0.04

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Juntao ZHENG, Di WU, Jin XU, Guopeng XU, Zhihao ZHENG, Feng CHENG. Uncertainty evaluation of the measurement of gross beta activity in the groundwater of a nuclear power plant[J]. Journal of Radiation Research and Radiation Processing, 2025, 43(3): 030501-1

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