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电感耦合等离子体质谱法测定单晶铜中痕量放射性核素钍和铀的含量
Determination of thorium and uranium in copper using inductively coupled plasma mass spectrometry
- 核技术 2018年41卷第9期 文章编号：090301
- 作者机构：
北京大学物理学院 核物理与核技术国家重点实验室及高能物理研究中心 北京 100871
- 作者简介：
[ "袁影, 女, 1990年出生, 2018年于北京大学获硕士学位, 研究领域为高能物理实验与核物理", "YUAN Ying, female, born in 1990, graduated from Peking University with a master's degree in 2018, focusing on high-energy physics experiments and nuclear physics" ]
王思广, E-mail:siguang@pku.edu.cn WANG Siguang, E-mail:siguang@pku.edu.cn
- 基金信息：中国科技部重点研发计划项目(2016YFA0400300)
DOI：10.11889/j.0253-3219.2018.hjs.41.090301
中图分类号： TL817.4收稿日期：2018-04-12，
修回日期：2018-04-20，
纸质出版日期：2018-09
- 稿件说明：
移动端阅览
袁影, 王思广. 电感耦合等离子体质谱法测定单晶铜中痕量放射性核素钍和铀的含量[J]. 核技术, 2018,41(9):090301
Ying YUAN, Siguang WANG. Determination of thorium and uranium in copper using inductively coupled plasma mass spectrometry[J]. Nuclear techniques, 2018, 41(9): 090301
袁影, 王思广. 电感耦合等离子体质谱法测定单晶铜中痕量放射性核素钍和铀的含量[J]. 核技术, 2018,41(9):090301 DOI： 10.11889/j.0253-3219.2018.hjs.41.090301.
Ying YUAN, Siguang WANG. Determination of thorium and uranium in copper using inductively coupled plasma mass spectrometry[J]. Nuclear techniques, 2018, 41(9): 090301 DOI： 10.11889/j.0253-3219.2018.hjs.41.090301.
摘要
PandaX-Ⅲ实验位于中国锦屏极深地下实验室，将利用高压
136
Xe气体时间投影探测器进行无中微子双贝塔衰变事件的寻找。建造高灵敏度的大型探测器需要挑选放射性极低的高纯材料以对本底进行严格的控制。本工作应用电感耦合等离子体质谱（Inductively Coupled Plasma Mass Spectrometry，ICP-MS）法测定纯度极高的单晶铜中痕量钍和铀的含量。在样品消解前加入
230
Th和
235
U分别作为标记核素，样品经过8 mol·L
-1
HNO
3
消解后，依次通过TEVA和UTEVA树脂柱，实现待测核素
232
Th、
238
U与基体元素Cu的分离。利用同位素稀释法-ICP-MS测定
232
Th和
238
U的含量。通过空白样品实验测量，
232
Th的检出限是0.036 pg（
232
Th）·g
-1
（0.15 μBq（
232
Th）·kg
-1
），
238
U的检出限是0.070 pg（
238
U）·g
-1
（0.86μBq（
238
U）·kg
-1
）；单晶铜样品中
232
Th及
238
U的检出限分别是0.21 pg（
232
Th）·g
-1
（0.85 μBq（
232
Th）·kg
-1
）和0.45 pg（
238
U）·g
-1
（5.56 μBq（
238
U）·kg
-1
）。该方法可为探测器建造过程中的材料选取工作提供技术支持。
Abstract
Background
2
PandaX-Ⅲ is designed to search for the neutrinoless double-beta decay (0υββ) with high pressure
136
Xe gas time projection chambers at the China Jinping underground laboratory (CJPL). This rare decay can be easily covered by background
so ultra-low-background materials should be chosen as the construction for PandaX-Ⅲ.
Purpose
2
This work attempts to establish a method to determine Th and U in copper based on inductively coupled plasma mass spectrometry (ICP-MS).
Methods
2
The samples were digested by 8 mol·L
-1
HNO
3
.
230
Th and
235
U were spiked in the digestion solution for quantitative analysis. TEVA resin and UTEVA resin were chosen for separation of Th and U from copper. After the Th and U were pre-concentration by the resins columns
ICP-MS was applied to the determination.
Results
2
Detection limits of 0.036 pg(
232
Th)·g
-1
(0.15 μBq(
232
Th)·kg
-1
) and 0.070 pg(
238
U)·g
-1
(0.87μBq(
238
U)·kg
-1
) were achieved for blank sample
detection limits of 0.21 pg(
232
Th)·g
-1
(0.85 μBq(
232
Th)·kg
-1
) and 0.45 pg(
238
U)·g
-1
(5.56 μBq(
238
U)·kg
-1
) were achieved for copper sample.
Conclusions
2
The method based on ICP-MS for the determination of Th and U in copper was presented
and can undertake the task of the radioactive assay of detector components for PandaX-Ⅲ.
关键词
Keywords
references
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