Manmade Tritium Inputs

The manmade tritium, which reached several thousand TU in precipitation during 1963, completely masked the natural tritium production discussed in the previous section. The awareness of the potential importance of tritium to hydrology arose only after the nuclear tests began. By that time the natural tritium content in precipitation could no longer be measured, but a unique solution was found—measurements in stored and dated wine bottles, 

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The described observations may be applied to practical problems. For example, the weighted average tritium concentration in Vienna was 3280 TU in 1963 (Fig. 10.3). How much tritium would be left in water that was recharged in 1963 and pumped in a well in 1988 The answer can be found by using the following steps  

From Fig. 10.1 one can read that after 25 years only 25% of the initial tritium is left. 

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