An updated review on tritium in the environment.

Current understanding of organically bound tritium (OBT) in the environment

Levels of tritium in soils and vegetation near Canadian nuclear facilities releasing tritium to the atmosphere: implications for environmental models

https://hal.archives-ouvertes.fr/hal-01117744/document

Isotopic fractionation of tritium in biological systems.

Apparent enrichment of organically bound tritium in rivers explained by the heritage of our past

Most published results concerning deuterium-hydrogen fractionation in plants are in the range 08-1, indicating no bioaccumulation of the heavy isotope In spite this, an updated compilation of litterature data show that 77% of OBT/TFWT ratios measured in terrestrial plants and food items are greater than one, with a mean value of 192 On the other hand, OBT/TFWT ratios for aquatic samples do not show such a tritium anomaly, with 81% of the published ratios being less than 1 This strongly suggests that the cause for excess tritium in terrestrial organic matter has to be found in the atmosphere We have developed a simple model of tritium incorporation during plant growth, forced by the annual cycle of tritium in precipitation taken from the IAEA/ISOHIS database The simulated distribution of the OBT/TFWT ratios for terrestrial samples shows many similarities with the observed one Although other processes such as soil moisture with lower tritium content than atmospheric water vapour can be invok

Environmental OBT/TFWT Ratios Revisited

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Environmental OBT/TFWT Ratios Revisited