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

Table 2

Specific activity of ²³²Th present in sand samples collected at depths of 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	15.9 ± 1.7	21.1 ± 2.8
2	17.1 ± 1.1	15.1 ± 0.9
3	13.7 ± 0.8	10.1 ± 0.5
4	16.9 ± 2.1	19.0 ± 2.2
5	25.5 ± 2.3	29.9 ± 1.4
6	13.1 ± 2.5	9.95 ± 2.1
7	14.1 ± 4.1	16.7 ± 4.4
8	17.2 ± 2.7	22.0 ± 2.4
9	20.3 ± 0.3	18.5 ± 3.8
10	12.8 ± 2.4	14.7 ± 1.3
11	11.1 ± 3.1	14.9 ± 0.9
12	28.5 ± 3.7	23.3 ± 5.5
13	20.2 ± 4.8	17.1 ± 2.9
14	14.5 ± 2.4	17.5 ± 0.4
15	14.5 ± 1.9	17.0 ± 1.1
Minimum	11.1 ± 3.1	9.95 ± 2.1
Maximum	28.5 ± 3.7	29.9 ± 1.4
Mean	16.8 ± 4.4	17.8 ± 4.9