Naturally Occurring Radioactive Materials in Construction 2017
DOI: 10.1016/b978-0-08-102009-8.00006-2
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From raw materials to NORM by-products

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Cited by 19 publications
(18 citation statements)
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“…When fly ash is mixed with Portland cement, the activity concentration index (ACI) in the resulting OPC + FA blends rises due to the increased presence of the gamma-ray emitting radionuclides used to calculate the index. The theoretical ACI values based on aluminium-or calcium-sulphate fly ash range from 1.2 to 1.3 [10,11,20,21,24,26,27], compared to pure Portland cement values of 0.2 to 0.3 [25,[28][29][30][31].…”
Section: Introductionmentioning
confidence: 92%
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“…When fly ash is mixed with Portland cement, the activity concentration index (ACI) in the resulting OPC + FA blends rises due to the increased presence of the gamma-ray emitting radionuclides used to calculate the index. The theoretical ACI values based on aluminium-or calcium-sulphate fly ash range from 1.2 to 1.3 [10,11,20,21,24,26,27], compared to pure Portland cement values of 0.2 to 0.3 [25,[28][29][30][31].…”
Section: Introductionmentioning
confidence: 92%
“…Fly ash, an industrial by-product generated in coal-fired steam power plants used as a mineral addition, is characterised by the high activity concentration of its natural radionuclides [10]. The natural radioactivity present in FA depends on the geological origin of the coal used and the ash particle size [22][23][24]. US Geological Surveys show that coal containing phosphate minerals such as monazite or apatite has high radioactive 232 Th concentrations, whereas coal containing both organic matter and mineral fractions has high 238 U radioactive series contents [25].…”
Section: Introductionmentioning
confidence: 99%
“…Fairly recent evidence of radioactive emissions from those materials, however, necessitates acquiring an understanding of and as far as possible controlling such radioactivity. Those two materials are described in detail in (10) and (20).…”
Section: Norm Waste Used In Cement and Concrete Productionmentioning
confidence: 99%
“…The natural radioactivity of fly ash depends on the geological age of the original coal bed, the combustion process used and ash particle size; being of interest due to the accumulation of radioactivity -polonium 210 -in the smallest particles of fly ashes (20,56,57). US Geological Surveys show that coal containing phosphate minerals such as monazite or apatite have high radioactive 232 Th concentrations, whereas coal containing both organic matter and mineral fractions have high levels of the 238 U radioactive series (58).…”
Section: Coal-fired Power Plant Fly Ash and Botton Ashmentioning
confidence: 99%
“…It is well known that mining leads to environmental pollution by naturally occurring radioactive materials (NORM) and heavy metals. For most human activities involving minerals and raw materials, the levels of exposure to these radionuclides are not significantly greater than normal background levels, and when these raw materials with low concentrations of NORM are introduced in an industrial process, the radionuclides can become more concentrated in the produced by-products or in waste material such as red mud in bauxite mining [3,4]. Such activities significantly increase the exposure of workers and the general public, meaning that they may need to be controlled by regulation in order to ensure the protection from radiation of relevant people.…”
Section: Introductionmentioning
confidence: 99%