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Read Morenatural radioactivity concentrations due to the coal mining in gabal el-maghara, north sinai, egypt, were determined using -ray spectroscopy. coal, water and soil samples were investigated in this study. the 226 ra, 232 th and 40 k activity concentrations in coal before extraction were 18.5 0.5, 29.5 1.2 and 149.0 8.4 bq kg 1 , respectively. these concentrations were reduced
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