Table 1 Activity concentrations of ²³⁸U, ²³²Th and ⁴⁰K.

Sample code	Activity concentration (Bq kg⁻¹)
Sample code	²³⁸U	²³²Th	⁴⁰K
C1	51 ± 4	24 ± 2	238 ± 19
S1	55 ± 4	27 ± 2	238 ± 19
K1	59 ± 4	27 ± 2	238 ± 15
G1	55 ± 3	24 ± 2	223 ± 11
C2	55 ± 4	27 ± 2	242 ± 19
S2	59 ± 5	24 ± 2	242 ± 19
K2	55 ± 2	27 ± 3	238 ± 13
G2	55 ± 2	27 ± 2	219 ± 12
C3	59 ± 5	32 ± 3	247 ± 20
S3	63 ± 6	24 ± 2	257 ± 21
K3	55 ± 1	27 ± 4	242 ± 14
G3	51 ± 2	29 ± 5	242 ± 15
C4	55 ± 5	27 ± 2	238 ± 19
S4	63 ± 6	29 ± 2	257 ± 21
K4	59 ± 3	29 ± 4	252 ± 15
G4	55 ± 1	27 ± 2	238 ± 13
C5	47 ± 4	29 ± 2	247 ± 20
S5	59 ± 5	29 ± 2	247 ± 20
K5	55 ± 2	29 ± 3	238 ± 15
G5	55 ± 1	29 ± 4	238 ± 14
C6	59 ± 5	27 ± 2	247 ± 20
S6	55 ± 4	29 ± 2	252 ± 20
K6	51 ± 2	27 ± 2	242 ± 14
G6	51 ± 1	27 ± 2	238 ± 15
C7	55 ± 4	29 ± 2	238 ± 19
S7	55 ± 4	27 ± 2	242 ± 19
K7	55 ± 1	24 ± 1	238 ± 13
G7	59 ± 2	29 ± 3	247 ± 17
Average	56 ± 3	27 ± 2	242 ± 17
World average	33	45	420

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