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HTO Emission from Contaminated Surfaces and Distribution in Environmental Media Around Nuclear Facilities

Hikaru Amano

Fusion Science and Technology / Volume 41 / Number 3P2 / May 2002 / Pages 488-492

Environment / Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001

Field studies were undertaken on both a wetland, which is downgrabient from a radioactive waste storage area at Chalk River Laboratory, and a grassland near Pickering nuclear power station. The purpose for this study was to quantify HTO (tritiated water/vapor) transfer in the land surface environment. The amounts of evaporation and transpiration were separately estimated, because the specific activity of tritium (HTO) is commonly different between surface and subsurface soil. Most of the water and tritium fluxes are attributed to transpiration in the season examined. Measured tritium concentrations in leaves at daytime agreed with predicted values, which are based on a simple equation. The ratios of organically bound tritium (OBT) to free water tritium ranged from 0.2 to 0.8 in this study.

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