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March 2019 18107649 ' <br /> Table 10: Typical Tritium Concentrations in Groundwater ' <br /> Tritium Concentration Qualitative Assessment <br /> < 0.8 TU Sub modern- recharged prior to 1952 , <br /> 0.8 to-4 TU Mixture between sub modern and recent ages <br /> 5 to 15 TU Modern (< 5 to 10 years) <br /> 15 to 30 TU Some bomb 3H present ' <br /> > 30 TU Large constituent of recharge from 1960s or 1970s <br /> > 50 TU Mainly 1960's recharge <br /> Source: Clark and Fritz(1997) ' <br /> GOLDER 1 ' <br />