用于低放射性仪器结构部件的超纯镍
核实验
2025-08-12 v1
摘要
下一代稀有事件搜索实验在核和粒子物理学中对结构材料提出了结合卓越机械强度与极低放射性污染水平的要求。本研究评估了化学气相沉积（CVD）镍作为此类应用的结构材料候选方案。经供应商提供的 CVD Ni 生长于铝基衬底上的样品，在焊接前后进行拉伸测试，并与标准 Ni 样品进行比较。CVD Ni 显示出约 600 MPa 的平面拉伸强度，显著超过标准镍。然而，焊接和热处理会使拉伸强度降至与标准镍相当，焊接部位的观察孔隙可能导致这种降低。通过诱导耦合等离子体质谱（ICP-MS）进行材料检测，采用同位素稀释法测得的批量浓度为约 70 ppt 的 232-Th、<100 ppt 的 238-U 和 ~900 ppt 的 nat-K，这是目前报告的镍中最低水平。表面刻蚀轮廓揭示了这些污染物在约 10 微米深处的更高浓度，可能与铝生长衬底有关。报告的结果与另一项在低放射性背景物理研究实验中使用 CVD Ni 的公开资料进行了比较，并就当前报告结果可能源于 CVD 制造或测试工艺变化提供了讨论。这些结果表明 CVD Ni 作为一种有前景的低放射性结构材料，同时概述了在焊接和表面清洗技术方面仍需进一步发展，以充分实现其在大规模、低放射性背景稀有事件搜索实验中的潜力。
引用
@article{arxiv.2508.08230,
title = {Ultra-pure Nickel for Structural Components of Low-Radioactivity Instruments},
author = {T. J. Roosendaal and C. T. Overman and G. S. Ortega and T. D. Schlieder and N. D. Rocco and L. K. S. Horkley and K. P. Hobbs and K. Harouaka and J. L. Orrell and P. Acharya and A. Amy and E. Angelico and A. Anker and I. J. Arnquist and A. Atencio and J. Bane and V. Belov and E. P. Bernard and T. Bhatta and A. Bolotnikov and J. Breslin and P. A. Breur and J. P. Brodsky and E. Brown and T. Brunner and B. Burnell and E. Caden and L. Q. Cao and D. Cesmecioglu and S. A. Charlebois and D. Chernyak and M. Chiu and T. Daniels and L. Darroch and R. DeVoe and M. L. di Vacri and M. J. Dolinski and B. Eckert and M. Elbeltagi and A. Emara and W. Fairbank and B. T. Foust and D. Gallacher and N. Gallice and W. Gillis and A. Gorham and G. Gratta and C. A. Hardy and S. C. Hedges and M. Heffner and E. Hein and J. D. Holt and A. Iverson and A. Karelin and I. V. Kotov and A. Kuchenkov and A. Larson and M. B. Latif and S. Lavoie and K. G. Leach and B. G. Lenardo and D. S. Leonard and K. K. H. Leung and H. Lewis and X. Li and Z. Li and C. Licciardi and R. Lindsay and R. MacLellan and S. Majidi and C. Malbrunot and M. Marquis. J. Masbou and M. Medina-Peregrina and S. Mngonyama and B. Mong and D. C. Moore and X. E. Ngwadla and K. Ni and A. Nolan and S. C. Nowicki and J. C. Nzobadila Ondze and A. Odian and L. Pagani and H. Peltz Smalley and A. Pena-Perez and A. Piepke and A. Pocar and S. Prentice and V. Radeka and R. Rai and H. Rasiwala and D. Ray and S. Rescia and G. Richardson and V. Riot and R. Ross and P. C. Rowson and R. Saldanha and S. Sangiorgio and S. Sekula and T. Shetty and L. Si and J. Soderstrom and F. Spadoni and V. Stekhanov and X. L. Sun and S. Thibado and T. Totev and S. Triambak and R. H. M. Tsang and O. A. Tyuka and E. van Bruggen and M. Vidal and M. Walent and Y. G. Wang and Q. D. Wang and M. P. Watts and M. Wehrfritz and L. J. Wen and S. Wilde and M. Worcester and X. M. Wu and H. Xu and H. B. Yang and L. Yang and O. Zeldovich},
journal= {arXiv preprint arXiv:2508.08230},
year = {2025}
}