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- W2017012595 abstract "Abstract There is an increased interest in measuring naturally occurring radioactive materials (NORM) like coal, fly ash considering health hazards caused by naturally occurring radionuclides. This paper presents activity concentration (AC) of 226 Ra, 228 Ra, 232 Th, 238 U and 40 K in feed coal, bottom and fly ash samples from Philippines coal-fired thermal power plants using inductively coupled plasma mass spectrometry (ICP-MS) and high-purity germanium gamma spectroscopy (HPGe γ-spectroscopy). Coal, bottom and fly ash samples were digested using a microwave oven with a mixture of HNO 3 , HClO 4 and HF. Uranium ( 238 U) and thorium ( 232 Th) ACs were also analyzed from samples using ICP-MS. A good correlation was found for the measurement of U and Th using both techniques ( R 2 = 0.97 and 0.94 respectively). ICP-MS measurements showed the highest AC of 232 Th and 238 U in fly ash and lowest for feed coal samples. With HPGe γ-spectroscopy measurements, highest AC (in Bq kg − 1 ) of 226 Ra, 228 Ra, 228 Th and 40 K, were noticed in fly ash followed by bottom ash and feed coal. ICP-MS method is rapid for the measurement of uranium and thorium in comparison to γ-spectroscopy as secular equilibrium is not required. Activity concentrations of bottom and fly ash samples were found to be within the reported values worldwide and below the International Atomic Energy Agency recommended values for regulatory control." @default.
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- W2017012595 date "2010-07-01" @default.
- W2017012595 modified "2023-10-11" @default.
- W2017012595 title "Accurate determination of naturally occurring radionuclides in Philippine coal-fired thermal power plants using inductively coupled plasma mass spectrometry and γ-spectroscopy" @default.
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- W2017012595 doi "https://doi.org/10.1016/j.microc.2009.11.008" @default.
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