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Using γ spectrometry, the concentration of the naturally occurring radionuclides 226 Ra, 232 Th and 40 K has been measured in soil, sand, cement, clay and bricks, which are used as building materials in Tiruvannamalai, Tamilnadu, India. The radium equivalent activity (Ra eq ), the criterion formula (CF), indoor gamma absorbed dose rate (D R ), annual effective...
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