A practical approach of high precision U and Th concentration measurement in acrylic
文献类型：期刊论文
| 作者 | Cao, Chuanya; Li, Nan; Yang, Xiaoyu; Zhao, Jie; Li, Yuanxia; Cai, Zhiyan; Wen, Liangjian; Luo, Xiaolan; Heng, Yuekun; Ding, Yayun |
| 刊名 | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
 |
| 出版日期 | 2021 |
| 卷号 | 1004 |
| 关键词 | Acrylic Ultra-low radioactivity ICP-MS Uranium Thorium |
| ISSN号 | 0168-9002 |
| DOI | 10.1016/j.nima.2021.165377 |
| 文献子类 | Article |
| 英文摘要 | The Jiangmen Underground Neutrino Observatory (JUNO) will build the world's largest liquid scintillator detector to study neutrinos from various sources. The 20 kilo tonne (kton) liquid scintillator will be stored in a 0.6 kton acrylic sphere with 35.4 m diameter due to the good light transparency, chemical compatibility and low radioactivity of acrylic. The concentration of U/Th in acrylic is required to be less than 1 ppt (10(-12) g/g) to achieve a low radioactive background in the fiducial volume of the JUNO detector. The mass production of acrylic has started, and the quality control requires a fast and reliable radioassay on U/Th in acrylic. We have developed a practical method of measuring U/Th in acrylic to sub-ppt level using the Inductively Coupled Plasma Mass Spectrometer (ICP-MS). The U/Th in acrylic can be concentrated by vaporizing acrylic in a class 100 environment, and the residue will be collected and sent to ICP-MS for measuring U/Th. All the other chemical operation is done in a class 100 clean room, and the ICP-MS measurement is done in a class 1000 clean room. The recovery efficiency is studied by adding the natural nonexistent nuclei Th-229 and U-233 as the tracers. The resulting method detection limit with 99% confidence can reach 0.04/0.09 ppt U-238/Th-232 in acrylic with (77.5 +/- 3.4)% and (73.6 +/- 4.1)% recovery efficiency. This equipment and method can not only be used for the quality control of JUNO acrylic, but also be further optimized for the radioassay on other materials with extremely low radioactivity, such as ultra-pure water and liquid scintillator. |
| 学科主题 | Instruments & Instrumentation ; Nuclear Science & Technology ; Physics |
| 电子版国际标准刊号 | 1872-9576 |
| 语种 | 英语 |
| WOS记录号 | WOS:000663801500005 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/297538]  |
| 专题 | 江门中微子实验 |
| 推荐引用方式 GB/T 7714 | Cao, Chuanya,Li, Nan,Yang, Xiaoyu,et al. A practical approach of high precision U and Th concentration measurement in acrylic[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2021,1004. |
| APA | Cao, Chuanya.,Li, Nan.,Yang, Xiaoyu.,Zhao, Jie.,Li, Yuanxia.,...&Ding, Yayun.(2021).A practical approach of high precision U and Th concentration measurement in acrylic.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,1004. |
| MLA | Cao, Chuanya,et al."A practical approach of high precision U and Th concentration measurement in acrylic".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 1004(2021). |
入库方式： OAI收割
来源：高能物理研究所
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