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Table 2

Classes of background enrichment factor (PIN)

ClassPIN valuesLevel of contamination
0 < PIN ≤ 7 Clean 
7 < PIN ≤ 95.1 Trace contamination 
95.1 < PIN ≤ 518.1 Lightly contaminated 
518.1 < PIN ≤ 2,548.6 Contaminated 
PIN > 2,548.6 Highly contaminated 
ClassPIN valuesLevel of contamination
0 < PIN ≤ 7 Clean 
7 < PIN ≤ 95.1 Trace contamination 
95.1 < PIN ≤ 518.1 Lightly contaminated 
518.1 < PIN ≤ 2,548.6 Contaminated 
PIN > 2,548.6 Highly contaminated 
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