Determination of thorium and uranium in copper using inductively coupled plasma mass spectrometry

Ying YUAN; Siguang WANG

doi:10.11889/j.0253-3219.2018.hjs.41.090301

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Determination of thorium and uranium in copper using inductively coupled plasma mass spectrometry

NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE | 更新时间：2021-05-19

- Determination of thorium and uranium in copper using inductively coupled plasma mass spectrometry
- NUCLEAR TECHNIQUES Vol. 41, Issue 9, Article number: 090301(2018)
- 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：
- 基金信息：
  
  the National Key Programme for Research and Development (NKPRD) from Ministry of Science and Technology, China
- DOI：10.11889/j.0253-3219.2018.hjs.41.090301
  CLC： TL817.4
- Received：12 April 2018，
  
  Revised：20 April 2018，
  
  Published：2018-09
- 稿件说明：
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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：

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

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

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

This work attempts to establish a method to determine Th and U in copper based on inductively coupled plasma mass spectrometry (ICP-MS).

Methods

The samples were digested by 8 mol·L

-1

HNO

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

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

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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