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Table 6 Geoaccumulation index (I geo ) for contamination levels in clay soil samples

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

Igeoclass

Igeovalue

Contamination level

0

I geo  ≤ 0

Uncontaminated

1

0 < I geo  ≤ 1

Uncontaminated/moderately contaminated

2

1 < I geo  ≤ 2

Moderately contaminated

3

2 < I geo  ≤ 3

Moderately/strongly contaminated

4

3 < I geo  ≤ 4

Strongly contaminated

5

4 < I geo  ≤ 5

Strongly/extremely contaminated

6

Igeo > 5

Extremely contaminated