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Table 4 Absorbed dose rates, radium equivalent activity, external and internal hazard and annual effective doses due to 238U, 232Th and 40K in soil and ore pad samples in the study area

From: Natural radioactivity levels in soils, rocks and water at a mining concession of Perseus gold mine and surrounding towns in Central Region of Ghana

Sample location Absorbed dose rate (nGyh−1) Radium equivalent activity (Bqkg−1) External hazard index Internal hazard index Annual effective dose (mSv)
P1 1121.5 336.5 0.9 1.2 1.38
P2 914.9 303.7 0.8 1.0 1.12
P3 829.0 280.2 0.8 1.0 1.02
P4 1071.2 277.4 0.7 0.9 1.31
P5 929.3 340.3 0.9 1.1 1.14
P6 977.1 321.3 0.9 1.1 1.20
O7 919.3 263.3 0.7 0.9 1.13
O8 469.3 136.6 0.4 0.4 0.58
S1 790.2 278.6 0.8 0.9 0.97
T1 548.3 243.1 0.7 0.8 0.67
T2 477.0 245.2 0.7 0.9 0.58
T3 333.9 187.0 0.5 0.7 0.41
T4 487.0 217.3 0.6 0.8 0.06
T5 513.8 178.2 0.5 0.6 0.63
Range 333.9–1121.5 136.6–340.3 0.4–0.9 0.4–1.2 0.41–1.38
Average ± σ 741.6 ± 260.1 257.8 ± 61.1 0.7 ± 0.2 0.9 ± 0.2 0.91 ± 0.32
  1. σ—Standard deviation