@article{a4e7efb0ecde4d2a9442c3ab63a49955,
title = "Identification of 210Pb and 210Po in the bulk of copper samples with a low-background alpha particle counter",
abstract = "We established a method to assay 210Pb and 210Po contaminations in the bulk of copper samples using a low-background alpha particle counter. The achieved sensitivity for the 210Pb and 210Po contaminations reaches a few mBq/kg. Due to this high sensitivity, the 210Pb and 210Po contaminations in oxygen free copper bulk were identified and measured for the first time. The 210Pb contaminations of our oxygen free copper samples were 17–40 mBq/kg. Based on our investigation of copper samples in each production step, the 210Pb in oxygen free copper was understood to be a small residual of an electrolysis process. This method to measure bulk contaminations of 210Pb and 210Po could be applied to other materials.",
keywords = "Alpha spectroscopy, Copper, Pb, Po, Radio purity",
author = "K. Abe and K. Hiraide and K. Ichimura and Y. Kishimoto and K. Kobayashi and M. Kobayashi and S. Moriyama and M. Nakahata and T. Norita and H. Ogawa and K. Sato and H. Sekiya and O. Takachio and A. Takeda and S. Tasaka and M. Yamashita and Yang, {B. S.} and Kim, {N. Y.} and Kim, {Y. D.} and Y. Itow and K. Kanzawa and R. Kegasa and K. Masuda and H. Takiya and K. Fushimi and G. Kanzaki and K. Martens and Y. Suzuki and Xu, {B. D.} and R. Fujita and K. Hosokawa and K. Miuchi and N. Oka and Y. Takeuchi and Kim, {Y. H.} and Lee, {K. B.} and Lee, {M. K.} and Y. Fukuda and M. Miyasaka and K. Nishijima and S. Nakamura",
note = "Funding Information: We gratefully acknowledge the cooperation of Mitsubishi Materials Corporation. They kindly provide us the copper samples in each copper production process, that helps the understanding of the origin of 210 Pb in OFC. We also gratefully acknowledge the cooperation of Kamioka Mining and Smelting Company. This work was supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology, Grant-in-Aid for Scientific Research, ICRR Joint-Usage, JSPS KAKENHI Grant Number, 26104004 . Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",
year = "2018",
month = mar,
day = "11",
doi = "10.1016/j.nima.2017.12.015",
language = "English",
volume = "884",
pages = "157--161",
journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
issn = "0168-9002",
publisher = "Elsevier",
}