Assay of lead-210 in metallic copper via accelerator mass spectrometry

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Doru Pacesila, Iuliana Stanciu, Razvan Gornea, William E. Kieser, Nimal De Silva, Albert Zondervan, Barbara Francisco, Michaela Froehlich, Michael Hotchkis, Marie-Cécile Piro and Guillaume Giroux
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Abstract

This study focuses on the precise quantification of 210Pb contamination in metallic copper, an essential construction material of ultra-sensitive detectors in astroparticle physics, by Accelerator Mass Spectrometry. For the most stable and durable anion beam current from the Cs sputter source, PbF2 in a mixture with fine Ag powder was found to be preferable over PbO + Ag. After tandem acceleration and electron stripping with helium, the maximum 206Pb3+ current was 0.11 μA, and the 210Pb detection efficiency was 1.3 × 10−4. Investigation of several methods to extract lead from copper, with HNO3, NH4OH, and H2SO4, led to chemical recovery rates up to 92%. Following the development of chemical and target preparation procedures, an upper limit of 210Pb = 62 mBq kg−1 was determined for the NEWS-G copper (Aurubis) sample, consistent with previous results obtained by α-spectrometry. Tests with copper plates exposed to an atmosphere of 222Rn (1625 Bq m−3) for 182 hours showed significant 210Pb surface contamination (0.56 ± 0.16 Bq m−2), underscoring the importance of minimizing radon in spaces where metallic copper is chemically and/or physically processed.

Abstract Image

用加速器质谱法测定金属铜中的铅210
本研究利用加速器质谱法对天体粒子物理超灵敏探测器必不可少的材料金属铜中的210Pb污染进行了精确定量分析。对于Cs溅射源的最稳定和持久的阴离子束电流,发现PbF2与细银粉的混合物比PbO + Ag更好。经氦串联加速和电子剥离后,206Pb3+的最大电流为0.11 μA, 210Pb的检测效率为1.3 × 10−4。采用HNO3、NH4OH、H2SO4三种萃取方法从铜中提取铅,化学回收率高达92%。根据化学和靶制备工艺的发展,确定了NEWS-G铜(Aurubis)样品的上限为210Pb = 62 mBq kg−1,与先前的α-光谱分析结果一致。将铜板暴露在222Rn (1625 Bq m−3)大气中182小时的测试显示,表面有明显的210Pb污染(0.56±0.16 Bq m−2),强调了在对金属铜进行化学和/或物理处理的空间中尽量减少氡的重要性。
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来源期刊
CiteScore
6.20
自引率
26.50%
发文量
228
审稿时长
1.7 months
期刊介绍: Innovative research on the fundamental theory and application of spectrometric techniques.
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