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Table 3
Comparison of activity concentrations of 238U, 232Th and 40K in soil samples from Douala littoral region following laboratory and in situ measurements with values from other areas around the world.
| Country | Activity concentration (Bq kg−1) | References | ||||||
|---|---|---|---|---|---|---|---|---|
| 238U | 232Th | 40K | ||||||
| Nigeria | Lagos state | 1.20–55.30(23) | 2.18–60.33(23) | 44.74–489.96(204) | Ojo and Gbadegesin (2015) | |||
| Itagunmodi | 18.5–90.3(55) | 12.5–52.4(26) | 200.5–901.2(501) | Ademola et al. (2014) | ||||
| Turkey | Canakkale | 14.9–118(42) | 18.7–146(53) | 197.1–1033.4(54) | Turhan et al. (2012) | |||
| India | Kerala | 25–1269 | 42–2374 | 22–964 | Hosoda et al. (2015) | |||
| Cameroon | Poli | 12–57(24) | 15–58(28) | 112–1124(506) | Saïdou et al. (2015b) | |||
| Bakassi | 17–23(19) | 27–38(32) | 93–138(110) | Saïdou et al. (2015b) | ||||
| Lolodorf | 60–270(130) | 100–700(390) | 370–1530(850) | Saïdou et al. (2015b) | ||||
| Douala (quarries) | 11.8–146.7(40) | 8–102.9(43) | 54–928(342) | Guembou et al. (2017) | ||||
| Douala | In situ | 18–47(29) | 21–54(38) | 110–410(202) | Present work | |||
| Labo | 29–96(60) | 29–92(57) | 40–79(56) | |||||
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