Method for determining <sup>226</sup>Ra in water via liquid scintillation counting and its uncertainty evaluation

Liangliang YIN; Yao ZHANG; Xiangyin KONG; Yuxin QIAN; Yanqin JI

doi:10.11889/j.1000-3436.2022-0064

Journal of Radiation Research and Radiation Processing, Volume. 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、*

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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Figures & Tables(9)

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

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

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

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

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

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

41.40

3.37

151

Hisafe 3

3.52

3.29

153

Hisafe 3

3.38

2.61

154

Table 3. Recovery and precision of the method

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Table 3. Recovery and precision of the method

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 4. Sources of uncertainties and their contributions
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Table 4. Sources of uncertainties and their contributions
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

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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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Paper Information

Category: Research Articles

Received: --

Accepted: Nov. 13, 2022

Published Online: Jul. 24, 2023

The Author Email: JI Yanqin (jiyanqin@nirp.chinacdc.cn)

DOI:10.11889/j.1000-3436.2022-0064

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

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

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

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

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

Table 3. Recovery and precision of the method

Table 3. Recovery and precision of the method

Table 4. Sources of uncertainties and their contributions

Table 4. Sources of uncertainties and their contributions