Determination of radionuclides and elemental composition of clay soils by gamma- and X-ray spectrometry

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Table 5 Average concentrations of selected elements, average shale (ppm) (Turekian and Wedepohl, 1961 ), enrichment factor and the geoaccumulation index values in the clay samples

Elements	Average Shale Value	Ado Ekiti	EF	I_geo	Ara-Ijero Ekiti	EF	I_geo	Ire Ekiti	EF	I_geo	Isan Ekiti	EF	I_geo	Orin Ekiti	EF	I_geo
Cu	45	100.6	1.00	0.58	107.6	1.01	0.67	91.6	0.99	0.44	143.2	0.92	1.09	82.6	1.09	0.29
Zn	95	161	0.76	0.18	184.2	0.82	0.37	202.4	1.03	0.51	257.2	0.79	0.85	166.4	1.04	0.22
Ni	68	136.8	0.90	0.42	151.8	0.95	0.57	180.4	1.29	0.82	133.2	0.57	0.39	147.2	1.29	0.53
Mn	850	1593	0.84	0.32	1869.4	0.93	0.55	1682.8	0.96	0.40	3780.6	1.29	1.57	1451.4	1.02	0.19
Pb	20	232.2	5.20	2.95	199.8	4.23	2.74	174.4	4.23	2.54	247.2	3.59	3.04	150.6	4.48	2.33
As	13	160	5.51	3.04	-	-	-	-	-	-	23	0.51	-	-	-	-