Mean activity concentration Bq∙kg−1

238U

232Th

40K

Location

1.

142.79 ± 3.1

29.69 ± 1.2

359.78 ± 1.6

Walvis Bay Beach

2.

199.76 ± 8.7

42.47 ± 2.8

611.19 ± 3.2

Swakopmund Beach

3.

176.44 ± 3.5

41.16 ± 1.9

354.38 ± 1.5

Henties Bay Beach

Average

173.00 ± 8.8

37.77 ± 2.7

441.78 ± 2.5