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Home All issues Volume 53 / No 4 (October-December 2018) Radioprotection, 53 4 (2018) 255-263 Full HTML
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Table 1

In situ activity concentrations and the contributions of 40K, 238U and 232Th to air absorbed dose rates in Douala using the car-borne survey method.

Point Latitude Longitude Absorbed dose rate in air Contribution to the dose
rate (%)		 Activity concentrations
(Bq kg−1)
  N E (nGy h−1) 40K 238U 232Th 40K 238U 232Th
Douala N4.05883 E9.701882 50 ± 1 12 28 60 146 ± 3 33 ± 2 48 ± 2
Douala N4.060352 E9.703057 50 ± 1 23 25 53 292 ± 6 31 ± 2 44 ± 2
Douala N4.062082 E9.701685 59 ± 1 27 33 40 386 ± 8 45 ± 3 36 ± 2
Douala N4.06649 E9.703935 32 ± 1 34 24 40 290 ± 6 18 ± 1 21 ± 1
Douala N4.070663 E9.696892 45 ± 1 36 23 41 410 ± 8 25 ± 3 30 ± 2
Douala N4.048405 E9.690173 32 ± 1 23 23 53 185 ± 4 18 ± 1 27 ± 1
Douala N4.045582 E9.689423 41 ± 1 17 28 54 187 ± 4 29 ± 2 37 ± 2
Douala N4.043308 E9.685862 29 ± 1 15 28 57 110 ± 2 20 ± 1 28 ± 1
Douala N4.041148 E9.685378 39 ± 1 12 30 58 129 ± 3 30 ± 2 39 ± 2
Douala N4.029897 E9.68979 45 ± 1 16 26 59 184 ± 4 28 ± 2 44 ± 2
Douala N4.026803 E9.690527 36 ± 1 14 26 60 130 ± 3 24 ± 2 36 ± 2
Douala N4.024398 E9.693795 52 ± 1 13 30 58 177 ± 4 39 ± 3 51 ± 3
Douala N4.019988 E9.701103 40 ± 1 20 26 55 210 ± 4 26 ± 2 37 ± 2
Douala N4.016748 E9.706783 33 ± 1 16 29 55 146 ± 3 25 ± 2 32 ± 2
Douala N4.05417 E9.734857 48 ± 1 16 25 58 208 ± 4 31 ± 2 47 ± 2
Douala N4.057508 E9.729035 41 ± 1 23 26 51 246 ± 5 27 ± 2 35 ± 2
Douala N4.064372 E9.715773 49 ± 1 15 29 56 200 ± 4 36 ± 3 47 ± 2
Douala N4.071107 E9.718553 36 ± 1 23 26 52 208 ± 4 22 ± 2 31 ± 2
Douala N4.081412 E9.728038 31 ± 1 16 29 56 131 ± 3 23 ± 2 30 ± 2
Douala N4.080985 E9.747512 37 ± 1 13 27 60 124 ± 2 26 ± 2 38 ± 2
Douala N4.084458 E9.755105 44 ± 1 13 29 59 143 ± 3 30 ± 2 42 ± 2
Douala N4.086427 E9.767235 46 ± 1 23 21 56 286 ± 6 25 ± 2 44 ± 2
Douala N4.079912 E9.772208 32 ± 1 15 28 57 130 ± 3 18 ± 1 32 ± 2
Douala N4.073662 E9.753895 35 ± 1 13 28 59 125 ± 3 25 ± 2 36 ± 2
Douala N4.065873 E9.759602 33 ± 1 16 27 57 139 ± 3 23 ± 2 32 ± 2
Douala N4.056127 E9.765598 43 ± 1 15 25 61 167 ± 3 27 ± 2 44 ± 2
Douala N4.053658 E9.761817 52 ± 1 15 25 61 201 ± 4 33 ± 2 54 ± 3
Douala N4.042078 E9.761412 42 ± 1 16 24 59 176 ± 4 25 ± 2 42 ± 2
Douala N4.032633 E9.766025 42 ± 1 22 25 53 237 ± 5 26 ± 2 37 ± 2
Douala N4.03475 E9.778138 49 ± 1 15 25 60 194 ± 4 31 ± 2 50 ± 3
Douala N4.026533 E9.791902 44 ± 1 16 25 60 184 ± 4 28 ± 2 45 ± 2
Douala N4.00135 E9.804472 40 ± 1 22 24 54 223 ± 4 24 ± 2 36 ± 2
Douala N4.049702 E9.738715 50 ± 1 24 25 51 312 ± 6 31 ± 2 43 ± 2
Douala N4.048875 E9.740258 48 ± 1 16 25 59 200 ± 4 30 ± 2 47 ± 2
Douala N4.047623 E9.728583 31 ± 1 20 27 54 155 ± 3 20 ± 1 28 ± 1
Douala N4.04285 E9.705237 43 ± 1 20 44 36 231 ± 5 47 ± 3 26 ± 1
Douala N4.043018 E9.702948 47 ± 1 29 33 39 359 ± 7 39 ± 3 31 ± 2
Douala N4.043115 E9.696225 44 ± 1 17 35 48 197 ± 4 39 ± 3 36 ± 2
Douala N4.017505 E9.715673 40 ± 1 12 36 52 127 ± 3 37 ± 3 36 ± 2

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