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 4

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

Sample ID	^226Ra Raeq (ARa)	^232Th Raeq (1.429ATh)	^40K Raeq (0.0769Ak)	Raeq(Total) (Bg/kg)	D (nGy/h)	Indoor AEDR (mSv/y)
Ruri1	92 ± 7	1701 ± 136	45 ± 4	1837 ± 147	221 ± 20	1.14 ± 0.09
Ruri2	103 ± 8	2634 ± 211	35 ± 3	2771 ± 222	267 ± 24	1.38 ± 0.11
Ruri3	81 ± 6	1035 ± 83	40 ± 3	1156 ± 92	446 ± 40	2.30 ± 0.18
Ruri4	21 ± 2	576 ± 46	26 ± 2	622 ± 50	497 ± 45	2.56 ± 0.20
Ruri5	63 ± 5	3075 ± 246	25 ± 2	3163 ± 253	555 ± 50	2.86 ± 0.23
Ruri6	71 ± 6	2215 ± 177	57 ± 5	2343 ± 187	632 ± 57	3.26 ± 0.26
Ruri7	110 ± 9	2123 ± 170	57 ± 5	2290 ± 183	661 ± 60	3.41 ± 0.27
Ruri8	226 ± 18	1512 ± 121	37 ± 3	1775 ± 142	764 ± 69	3.94 ± 0.31
Ruri9	145 ± 12	1280 ± 102	44 ± 3	1469 ± 118	785 ± 71	4.05 ± 0.32
Ruri10	189 ± 15	1328 ± 106	24 ± 2	1540 ± 123	817 ± 74	4.21 ± 0.34
Ruri11	46 ± 4	1248 ± 100	12 ± 1	1306 ± 104	850 ± 76	4.38 ± 0.35
Ruri12	87 ± 7	1766 ± 141	56 ± 4	1909 ± 153	979 ± 88	5.05 ± 0.40
Ruri13	196 ± 16	1716 ± 137	62 ± 5	1975 ± 158	1000 ± 90	5.15 ± 0.41
Ruri14	174 ± 14	829 ± 66	28 ± 2	1030 ± 82	1180 ± 106	6.08 ± 0.49
Ruri15	68 ± 5	426 ± 34	17 ± 1	511 ± 41	1342 ± 121	6.92 ± 0.55
Average	111 ± 09	1564 ± 125	38 ± 3	1713 ± 137	733 ± 66	3.78 ± 0.30