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. 2013 Feb 28;2:74. doi: 10.1186/2193-1801-2-74

Table 7.

Descriptive statistics of massic elemental concentrations of U, Th and K for all the analyzed clay samples

Parameter Massic elemental concentration
U (ppm) Th (ppm) K (%)
Mean 2.7212 4.9229 0.6716
Standard deviation 0.96973 1.40750 0.42847
Maximum 4.11 8.20 1.63
Minimum 1.17 2.73 0.09
Median 2.6215 4.5394 0.6670
Skewness −0.005 0.564 0.518
Kurtosis −1.366 −0.384 −0.596