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KMID : 0385520170300050252
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Analytical Science & Technology
2017 Volume.30 No. 5 p.252 ~ p.261
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Method development for quantitative analysis of naturally occurring radioactive nuclides in building materials
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Lim Jong-Myoung
Lee Hoon
Kim Chang-Jong
Jang Mee
Park Ji-Young
Chung Kun-Ho
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Abstract
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Naturally occurring radioactive materials (NORMs) increase radiation exposure to the public as these materials are concentrated through artificial manufacturing processes by human activities. This study focuses on the development of a method for the quantitative analysis of 232Th, 235U, and 238U in building materials. The accuracy and precision of inductively coupled plasma mass spectrometry (ICP-MS) for determination of digestion processes was evaluated for certified reference materials (CRMs) digested using various mixed acid (e.g., aqua regia, hydrofluoric acid, and perchloric acid) digestions and a LiBO2 fusion method. The method validation results reveal that a LiBO2 fusion and Fe(OH)3 co-precipitation should be applied as the optimal sample digestion process for the quantitative analysis of radionuclides in building materials. The radioactivity of 232Th, 235U, and 238U in a total of 51 building material (e.g., board, brick, cement, paint, tile, and wall paper) samples was quantitatively analyzed using an established process. Finally, the values of 238U and 232Th radioactivity were comprehensively compared with those from the indirect method using γ-spectrometry.
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KEYWORD
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NORM, Alkali fusion, ICP-MS, Building material, 238U, 232Th
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