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

Table 3

Specific activity of the ⁴⁰K radionuclide in sand samples collected at depths 0 m–0.3 m and 0.3 m–0.4 m from Ekalakala River.

Sample	Specific activity (Bqkg^−1)
	0 m–0.3 m	0.3 m–0.5 m
1	1270 ± 70	1460 ± 60
2	1370 ± 50	1300 ± 40
3	1190 ± 40	1380 ± 70
4	1100 ± 40	990 ± 50
5	1410 ± 60	1500 ± 70
6	800 ± 60	840 ± 70
7	1880 ± 30	1800 ± 50
8	1340 ± 80	1440 ± 40
9	1320 ± 30	1450 ± 50
10	900 ± 60	970 ± 60
11	1060 ± 40	1170 ± 50
12	1680 ± 60	1790 ± 70
13	1360 ± 50	1310 ± 60
14	1360 ± 30	1310 ± 70
15	1200 ± 60	1280 ± 70
Minimum	800 ± 60	840 ± 70
Maximum	1880 ± 30	1800 ± 50
Mean	1300 ± 300	1300 ± 300