Research Article

Determination of Activity Concentration of Natural Radionuclides and Radiation Hazards’ Assessment of Building Materials in High Background Radiation Areas of Homa and Ruri, Kenya

Table 3

Radium equivalent (Raeq), absorbed gamma radiation dose rate (D), and indoor annual effective dose rate (AEDR) in Homa.

Sample ID226Ra Raeq (ARa)232Th Raeq (1.429ATh)40K Raeq (0.0769Ak)Raeq (total) (Bg/kg)D (nGy/h)Indoor AEDR (mSv/y)

Homa1259 ± 21855 ± 6873 ± 61186 ± 95520 ± 472.68 ± 0.21
Homa2178 ± 14957 ± 80100 ± 81235 ± 99541 ± 492.79 ± 0.22
Homa367 ± 5704 ± 6380 ± 6851 ± 68372 ± 331.92 ± 0.15
Homa4129 ± 10902 ± 7185 ± 71116 ± 89487 ± 442.51 ± 0.20
Homa531 ± 2170 ± 4947 ± 4248 ± 20112 ± 100.58 ± 0.05
Homa6216 ± 17504 ± 5359 ± 5779 ± 62345 ± 311.78 ± 0.14
Homa751 ± 4473 ± 5158 ± 5582 ± 47255 ± 231.31 ± 0.11
Homa845 ± 4733 ± 6379 ± 6858 ± 69374 ± 341.93 ± 0.15
Homa9157 ± 13180 ± 5661 ± 5398 ± 32182 ± 160.94 ± 0.07
Homa1016 ± 1120 ± 342 ± 3178 ± 1481 ± 70.42 ± 0.03
Homa11223 ± 18600 ± 6076 ± 6899 ± 72398 ± 362.05 ± 0.16
Homa12220 ± 18596 ± 5764 ± 5879 ± 70388 ± 352.00 ± 0.16
Homa1378 ± 6540 ± 6874 ± 6692 ± 55305 ± 271.57 ± 0.13
Homa14191 ± 15684 ± 5965 ± 5941 ± 75413 ± 372.13 ± 0.17
Homa1572 ± 6524 ± 5768 ± 5665 ± 53292 ± 261.50 ± 0.12
Average129 ± 10570 ± 4669 ± 5767 ± 61338 ± 301.74 ± 0.14