Abstract
Tritium that was not present in the original water sample (“blank”) is observed when measuring tritium concentrations which are near analytical detection limit (in this laboratory about ±0.08TU, or ±0.26pCi/1 of water, 1σ). The analytical blank in this laboratory is determined to be 0.07 ± 0.03TU. Water samples stored in 1 1. gas bottles gain tritium at a rate of 0.01 TU per year (polyethylene bottles: 0.20 TU per year, ±15%), for an ambient tritium level of about 200 TU. An upper limit of 0.07 TU (2σ) is derived for the true tritium concentration of Northeast Atlantic deep and bottom water (∼40°N/15°W, 1972-74, depth 2000 m or more). This limit amounts to about 1% of the tritium concentration in North Atlantic surface water.
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