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Journals >Journal of Radiation Research and Radiation Processing >Volume 41 >Issue 2 >Page 020701 > Article

Journal of Radiation Research and Radiation Processing
Vol. 41, Issue 2, 020701 (2023)

Method for determining ²²⁶Ra in water via liquid scintillation counting and its uncertainty evaluation

Liangliang YIN¹, Yao ZHANG², Xiangyin KONG³, Yuxin QIAN¹, and Yanqin JI^1、*

Author Affiliations

¹Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China

²Taiyuan Centers for Disease Control and Prevention, Taiyuan 030012, China

³China Institute of Nuclear Industry Strategy, Beijing 100048, China

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DOI: 10.11889/j.1000-3436.2022-0064 Cite this Article

Liangliang YIN, Yao ZHANG, Xiangyin KONG, Yuxin QIAN, Yanqin JI. Method for determining ²²⁶Ra in water via liquid scintillation counting and its uncertainty evaluation[J]. Journal of Radiation Research and Radiation Processing, 2023, 41(2): 020701 Copy Citation Text

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Procedure of analysis of 226Ra by liquid scintillation counter

Fig. 1. Procedure of analysis of ²²⁶Ra by liquid scintillation counter

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Effects on α/β discrimination setting and spillover by concentration of ultrapure water and ammonia-water medium (color online)

Fig. 2. Effects on α/β discrimination setting and spillover by concentration of ultrapure water and ammonia-water medium (color online)

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Fig. 3. α/β discrimination parameter optimization

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Fig. 4. Spectra of ²²⁶Ra in spectral analysis software

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Fig. 5. Cause and effect diagram for uncertainty of ²²⁶Ra analysis

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碱性溶液

Alkaline solution

溶液浓度 / (mol∙L^-1) Concentration of solution

0.2

0.3

0.5

1.0

2.0

3.0

4.0

NaOH

溶解不完全

Incomplete dissolution

溶解不完全

Incomplete dissolution

溶解，慢

Slow dissolution

溶解

Dissolution

溶解

Dissolution

溶解

Dissolution

溶解

Dissolution

NH₃

—

—

溶解，快

Rapid dissolution

—

—

—

—

Table 1. Effects on dissolution precipitation by EDTA-2Na in different alkaline mediums

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闪烁液种类

Scintillation liquid type

闪烁液体积 / mL

Volume of scintillating liquid

α错分率 / %

α spillover（τ_α）

β错分率 / %

β spillover（τ_β）

甄别因子

Discrimination factor

Gold AB

14

41.40

3.37

151

Hisafe 3

14

3.52

3.29

153

Hisafe 3

16

3.38

2.61

154

Table 2. Influence on α/β spillover and α/β discrimination factor by scintillation liquid type and volume

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序号 No.	空白样计数率 $n_{b}$ / min^-1 Counting rate of blank sample	加标样计数率 $n_{1}$ / min^-1 Counting rate of spiked sample	加标活度浓度 $A_{Y}$ /（Bq∙L^-1） Added activity concentration	总效率 $ε_{a l l}$ / % Overall efficiency
1	0.20	27.58	1.0	91.3
2	0.20	28.44	1.0	94.1
3	0.20	29.75	1.0	98.5
4	0.20	29.52	1.0	97.7
5	0.20	28.17	1.0	93.2
6	0.20	28.63	1.0	94.8

Table 3. Recovery and precision of the method

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变量 Variable	值 Value	相对不确定度 Relative uncertainty	对 u_rel(A)的贡献率 / % Contribution rate to u_rel(A)
n_s	28.95	0.026	56.22
ε_all	91%	0.023	43.10
V	0.5 L	0.003	0.18

Table 4. Sources of uncertainties and their contributions

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References (14)

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Liangliang YIN, Yao ZHANG, Xiangyin KONG, Yuxin QIAN, Yanqin JI. Method for determining ²²⁶Ra in water via liquid scintillation counting and its uncertainty evaluation[J]. Journal of Radiation Research and Radiation Processing, 2023, 41(2): 020701

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