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
TL817+.4; PandaX-Ⅲ实验位于中国锦屏极深地下实验室,将利用高压136Xe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230Th和235U分别作为标记核素,样品经过8 mol·L-1 HNO3消解后,依次通过TEVA和UTEVA树脂柱,实现待测核素232Th、238U与基体元素Cu的分离.利用同位素稀释法-...
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| Published in | 核技术 Vol. 41; no. 9; pp. 21 - 26 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | Chinese |
| Published |
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
10.09.2018
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-3219 |
| DOI | 10.11889/j.0253-3219.2018.hjs.41.090301 |
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| Abstract | TL817+.4; PandaX-Ⅲ实验位于中国锦屏极深地下实验室,将利用高压136Xe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230Th和235U分别作为标记核素,样品经过8 mol·L-1 HNO3消解后,依次通过TEVA和UTEVA树脂柱,实现待测核素232Th、238U与基体元素Cu的分离.利用同位素稀释法-ICP-MS测定232Th和238U的含量.通过空白样品实验测量,232Th的检出限是0.036 pg(232Th)·g-1 (0.15 μBq(232Th)·kg-1),238U的检出限是0.070 pg(238U)·g-1 (0.86 μBq(238U)·kg-1);单晶铜样品中232Th及238U的检出限分别是0.21 pg(232Th)·g-1 (0.85 μBq(232Th)·kg-1)和0.45 pg(238U)·g-1 (5.56 μBq(238U)·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. |
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| AbstractList | TL817+.4; PandaX-Ⅲ实验位于中国锦屏极深地下实验室,将利用高压136Xe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230Th和235U分别作为标记核素,样品经过8 mol·L-1 HNO3消解后,依次通过TEVA和UTEVA树脂柱,实现待测核素232Th、238U与基体元素Cu的分离.利用同位素稀释法-ICP-MS测定232Th和238U的含量.通过空白样品实验测量,232Th的检出限是0.036 pg(232Th)·g-1 (0.15 μBq(232Th)·kg-1),238U的检出限是0.070 pg(238U)·g-1 (0.86 μBq(238U)·kg-1);单晶铜样品中232Th及238U的检出限分别是0.21 pg(232Th)·g-1 (0.85 μBq(232Th)·kg-1)和0.45 pg(238U)·g-1 (5.56 μBq(238U)·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. |
| Author | 袁影 王思广 |
| AuthorAffiliation | 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 |
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| Author_FL | WANG Siguang YUAN Ying |
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| DocumentTitle_FL | Determination of thorium and uranium in copper using inductively coupled plasma mass spectrometry |
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| Keywords | 电感耦合等离子体质谱 铀 UTEVA 痕量 TEVA 钍 单晶铜 |
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| Title | 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 |
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