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

Sample ID	^226Ra Raeq (ARa)	^232Th Raeq (1.429ATh)	^40K Raeq (0.0769Ak)	Raeq (total) (Bg/kg)	D (nGy/h)	Indoor AEDR (mSv/y)
Homa1	259 ± 21	855 ± 68	73 ± 6	1186 ± 95	520 ± 47	2.68 ± 0.21
Homa2	178 ± 14	957 ± 80	100 ± 8	1235 ± 99	541 ± 49	2.79 ± 0.22
Homa3	67 ± 5	704 ± 63	80 ± 6	851 ± 68	372 ± 33	1.92 ± 0.15
Homa4	129 ± 10	902 ± 71	85 ± 7	1116 ± 89	487 ± 44	2.51 ± 0.20
Homa5	31 ± 2	170 ± 49	47 ± 4	248 ± 20	112 ± 10	0.58 ± 0.05
Homa6	216 ± 17	504 ± 53	59 ± 5	779 ± 62	345 ± 31	1.78 ± 0.14
Homa7	51 ± 4	473 ± 51	58 ± 5	582 ± 47	255 ± 23	1.31 ± 0.11
Homa8	45 ± 4	733 ± 63	79 ± 6	858 ± 69	374 ± 34	1.93 ± 0.15
Homa9	157 ± 13	180 ± 56	61 ± 5	398 ± 32	182 ± 16	0.94 ± 0.07
Homa10	16 ± 1	120 ± 3	42 ± 3	178 ± 14	81 ± 7	0.42 ± 0.03
Homa11	223 ± 18	600 ± 60	76 ± 6	899 ± 72	398 ± 36	2.05 ± 0.16
Homa12	220 ± 18	596 ± 57	64 ± 5	879 ± 70	388 ± 35	2.00 ± 0.16
Homa13	78 ± 6	540 ± 68	74 ± 6	692 ± 55	305 ± 27	1.57 ± 0.13
Homa14	191 ± 15	684 ± 59	65 ± 5	941 ± 75	413 ± 37	2.13 ± 0.17
Homa15	72 ± 6	524 ± 57	68 ± 5	665 ± 53	292 ± 26	1.50 ± 0.12
Average	129 ± 10	570 ± 46	69 ± 5	767 ± 61	338 ± 30	1.74 ± 0.14