3 years ago

Identification of $^{210}$Pb and $^{210}$Po in the bulk of copper samples with a low-background alpha particle counter.

Y. Suzuki, M. Kobayashi, K. Kanzawa, K. Ichimura, R. Fujita, XMASS collaboration, Y. Takeuchi, G.Kanzaki, K. Kobayashi, K. Nishijima, M. Yamashita, O. Takachio, S. Moriyama, R. Kegasa, Y. Itow, H. Takiya, B. S. Yang, K. Abe, Y. D. Kim, M. Nakahata, K. Masuda, K. Miuchi, H. Ogawa, A. Takeda, T. Norita, N. Y. Kim, S. Nakamura, H. Sekiya, B. D. Xu, K. Martens, Y. Fukuda, K. Sato, M. Miyasaka, Y. Kishimoto, S. Tasaka, M. K. Lee, K. B. Lee, N. Oka, K. Hosokawa, K. Fushimi, K. Hiraide, Y. H. Kim

We established a method to assay $^{210}$Pb and $^{210}$Po contaminations in the bulk of copper samples using a low-background alpha particle counter. The achieved sensitivity for the $^{210}$Pb and $^{210}$Po contaminations reaches a few mBq/kg. Due to this high sensitivity, the $^{210}$Pb and $^{210}$Po contaminations in oxygen free copper bulk were identified and measured for the first time. The $^{210}$Pb contaminations of our oxygen free copper samples were 17-40 mBq/kg. Based on our investigation of copper samples in each production step, the $^{210}$Pb in oxygen free copper was understood to be a small residual of an electrolysis process. This method to measure bulk contaminations of $^{210}$Pb and $^{210}$Po could be applied to other materials.

Publisher URL: http://arxiv.org/abs/1707.06413

DOI: arXiv:1707.06413v2

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