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A study on the HTS-NAA/γ-spectrometry for the analysis of alpha-particle emitting impurities in silica  

Lee, Kil Yong (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources)
Yoon, Yoon Yeol (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources)
Cho, Soo Young (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources)
Yang, Myung Kwon (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources)
Shim, Sang Kwon (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources)
Kim, Yongje (Groundwater & Geothermal Division, Korea Institute of Geoscience & Mineral Resources)
Chung, Yong Sam (HANARO utilization Team, Korea Atomic Energy Research Institute)
Publication Information
Analytical Science and Technology / v.18, no.1, 2005 , pp. 5-12 More about this Journal
Abstract
It has been established that soft error of high precision electronic circuits can be induced by alpha particles emitted from the naturally occurring radioactive impurities such as U, and Th. As the electronic circuits have recently become lower dimension and higher density, these alpha-particle emitting radioactive impurities have to be strictly controlled. The aim of this study is to develop of NAA (Neutron Activation Analysis) and gamma-spectrometry to improve the analytical sensitivity and precision of U and Th. A new NAA method has been established using the HTS (Hydrulic transfer system) irradiation facility which has been used to produce radioisotopes for industries and medicines instead of the PTS (pneumatic transfer system) irradiation facility which has been used in general NAA. When the ultratrace impurities have to be analyzed by NAA, background gamma-ray spectra induced from $^{222}Rn$ and its progenies in air is serious problem. This unstable background has been eliminated or stabilized by the use of a nitrogen purging system. Ultra trace amounts of U (0.1 ng/g) and Th (0.01 ng/g) in high purity silica used for EMC could be analyzed by the use of HTS-NAA and low background gamma-spectrometry.
Keywords
soft error; alpha-emitting impurities; high purity silica; NAA; gamma-spectrometry; low background;
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  • Reference
1 B.K.Seo, K.Y.Lee, Y.Y.Yoon and D.W.Lee, Anal. Sci. Tech, 14(3), 95(2001)
2 T.C.May, 'Soft errors in VLSI : present and future', Microelectronics. and Reliability, 20(6), 907(1980)
3 E.Takeda, E.Murakami, K.Torii, Y.Okuyama, E.Ebe, K.Hinode and S.Kimura, Microelectro. and Reliability, 42(4-5), 493(2002)   DOI   ScienceOn
4 S.J.Parry, Activation Spectrometry in Chemical Analysis, John Wiley and Sons, Inc.,196(1991)
5 D.J.W.Noorlag, L.M.Terman and A.G.Konheim, Microelectronics. and Reliability, 20(6), 905 (1980)
6 R.C.Baumann, E.B.Smith, Microelectro. and Reliability, 41(2), 211(2001)   DOI   ScienceOn
7 M.Brodsky, Hardening RAMs against soft errors', Microelectro. and Reliability, 20(6), 899 (1980)   DOI   ScienceOn
8 T.C.May and M.H.Woods, Microelectronics. and Reliability, 18(6), 480(1978)
9 R.Caletka, R.Hausbek, V.Krivan, J. Radioanal. Nucl. Chem., 120, 319(1988)   DOI
10 IAEA-TECDOC-564, Practical Aspects of Operating a NAA Laboratory, IAEA, Vienna, 20(1990)