Assessment of Levels of Natural Radioactivity in Sand Samples Collected from Ekalakala in Machakos County, Kenya

Table 7

Indoor, outdoor, and average annual effective dose rate (mSvy⁻¹) for sand samples collected at Ekalakala River.

Sample	Indoor AEDR (mSvy^−1)	Outdoor AEDR (mSvy^−1)	Total AEDR (mSvy^−1)
1	0.28	0.19	0.24
2	0.27	0.18	0.23
3	0.25	0.17	0.21
4	0.23	0.15	0.19
5	0.32	0.21	0.27
6	0.17	0.11	0.14
7	0.35	0.23	0.29
8	0.30	0.20	0.25
9	0.29	0.19	0.24
10	0.2	0.13	0.16
11	0.23	0.15	0.19
12	0.28	0.18	0.23
13	0.21	0.14	0.18
14	0.21	0.14	0.18
15	0.20	0.13	0.16
Maximum	0.35	0.23	0.29
Minimum	0.17	0.11	0.14
Average	0.25 ± 0.05	0.17 ± 0.03	0.21 ± 0.04