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Table 4
Comparison of radioactivity concentration and radium equivalent activity (Raeq) in building materials samples from Mayo-Kebbi region (Chad), with that of other countries around the world.
| Radioactivity concentration (Bq kg−1) | ||||||
|---|---|---|---|---|---|---|
| Materials | Countries | 226Ra | 232Th | 40K | Raeq (Bq kg−1) | References |
| Cement | Algeria | 41 | 27 | 422 | 112 | (Amrani and Tahtat, 2001) |
| Greece | 20 | 13 | 247 | – | (Stoulos et al., 2003) | |
| Egypt | 31.3 | 11.1 | 48.6 | 50.9 | (Ahmed and Hussein, 1998) | |
| China | 64.7 | 38.5 | 328.7 | 142.7 | (Li et al., 2016) | |
| Cameroon | 27.01 | 15.24 | 276.53 | 70.1 | (Ngachin et al., 2007) | |
| Cuba | 45 | 22 | 99 | 83 | (Brigido Flores et al., 2008) | |
| Italy | 38 | 22 | 218 | 92 | (Rizzo et al., 2001) | |
| Zambia | 23 | 32 | 134 | 79 | (Hayumbu et al., 1995) | |
| Brazil | 61.7 | 58.5 | 564 | 188.8 | (Malanca et al., 1993) | |
| Bangladesh | 62.3 | 59.4 | 329.0 | 172.8 | (Mantazul et al., 1998) | |
| Bangladesh | 29.7 | 54.3 | 523 | 148 | (Alam et al., 1999) | |
| K.S.A | 38.4 | 45.3 | 86 | 108 | El-Taher, 2012) | |
| Malaysia | 51 | 23 | 832 | 188 | (Ibrahim, 1999) | |
| Chad | 5.85 | 5.73 | 81.31 | 20.31 | This work | |
| Sand | Algeria | 12.0 | 07.0 | 74.0 | 28.0 | (Amrani and Tahtat, 2001) |
| Australia | 3.7 | 40 | 44.4 | 64.32 | (Beretka and Mathew, 1985) | |
| Cameroon | 14.23 | 31.25 | 586.33 | 104.06 | (Ngachin et al., 2007) | |
| Douala, Cameroon | 40.09 | 43.24 | 341.79 | 128.24 | (Guembou Shouop et al., 2017a, 2017b) | |
| Cuba | 17 | 16 | 208 | 55 | (Brigido Flores et al., 2008) | |
| China | 22.2 | 15.4 | 260.9 | 55.3 | (Li et al., 2016) | |
| Greece | 18 | 17 | 367 | – | (Stoulos et al., 2003) | |
| Egypt | 9.2 | 3.3 | 47.3 | 17.56 | (Ahmed and Hussein, 1998) | |
| India, Namakkal | 2.27 | 21.72 | 352.8 | 59.68 | (Ravisankar et al., 2012) | |
| Pakistan | 20 | 29 | 383 | 91 | (Faheem and Mujahid, 2008) | |
| Palestine | 20.6 | 18.8 | 26.3 | – | (Dabayneh, 2007) | |
| K.S.A | 12.3 | 24.2 | 195 | 60.35 | (El-Taher, 2012) | |
| USA | 37 | 33.3 | 18.5 | 86 | (El-Mageed et al., 2014) | |
| Xianyang, China | 25.8 | 26.8 | 553.6 | 106.7 | (Xinwei et al., 2012) | |
| Yemen | 20.78 | 27.68 | 1118.36 | 164.5 | (El-Mageed et al., 2014) | |
| Chad | 3.99 | 3.08 | 158.04 | 20.56 | This work | |
| Gravel | Brazil | 10.3 | N.D | 933 | 82.1 | (Malanca et al., 1993) |
| Cameroon | 24.47 | 138.89 | 1161.46 | 312.51 | (Ngachin et al., 2007) | |
| Cuba | 20 | 13 | 134 | 49 | (Brigido Flores et al., 2008) | |
| Pakistan | 24.8 | 9.9 | 51.3 | 42.9 | (Tufail et al., 1992) | |
| Egypt | 13.4 | 23 | 193 | 62.4 | (El-Taher, 2010) | |
| Nederland | 9.7 | 12.6 | 140 | 38.5 | (Aders et al., 1985) | |
| K.S.A | 14.7 | 24.2 | 195 | 65.7 | (El-Taher, 2012) | |
| Australia | 13.9 | 14.8 | 171 | 48.2 | (Bou-Rabee and Bem, 1996) | |
| USA | 33.3 | 33.3 | 14.8 | 82 | (El-Mageed et al., 2014) | |
| Chad | 3.29 | 1.51 | 52.70 | 9.51 | This work | |
| Brick | Cameroon | 49.57 | 91.28 | 171.96 | 193.34 | (Ngachin et al., 2007) |
| Cuba | 57 | 12 | 857 | 140 | (Brigido Flores et al., 2008) | |
| Tamil Nadu, India | 13.180 | 101.340 | 386.380 | 187.847 | (Raghu et al., 2015) | |
| Malaysia | 241 | 51 | 7541 | 895 | (Ibrahim, 1999) | |
| Bangladesh | 29.47 | 52.50 | 292.25 | 127.14 | (Mantazul et al., 1998) | |
| Chad | 56.31 | 15.92 | 283.33 | 100.89 | This work | |
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