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

Table 1

Specific activity in Bqkg⁻¹ for ²³⁸U in sand samples collected at depths 0 m–0.3 m and 0.3 m–0.5 m from Ekalakala River.

Sample	Specific activity (Bqkg^−1)
	0 m–0.3 m	0.3 m–0.5 m
1	14 ± 1.4	16 ± 5.0
2	15 ± 1.5	12 ± 0.6
3	11.0 ± 0.6	9.5 ± 0.8
4	11.7 ± 0.1	13.4 ± 2.1
5	13.2 ± 0.1	19.9 ± 0.8
6	8.6 ± 1.0	10.7 ± 0.3
7	9.2 ± 0.8	13.3 ± 2.0
8	21.3 ± 1.3	19.4 ± 1.1
9	19.4 ± 0.6	16 ± 3.3
10	7.9 ± 3.0	13 ± 0.5
11	11.2 ± 0.2	17.4 ± 0.1
12	25.2 ± 0.8	22.7 ± 1.0
13	15.7 ± 0.3	12.2 ± 0.2
14	10.3 ± 0.8	13.6 ± 0.4
15	10.4 ± 1.1	15 ± 1.2
Minimum	7.9 ± 3.0	9.5 ± 0.8
Maximum	25.2 ± 0.8	22.7 ± 1.0
Mean	13.6 ± 4.8	14.9 ± 3.6