Table 1: Water collected in the Centre de la Manche underground gallery

1 January 2000

?1991 2007
Volume 21,000 m3 300 m3
Alpha activity 0.4 GBq 0.005 GBq
Beta activity (except tritium) 1.3 GBq 0.01 GBq
Tritium 1700 GBq 4.4 GBq

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