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

As part of a multidisciplinary project aimed at studying mid-ocean ridge processes near the Azores, fifty water column profiles were analysed for 3He/4He ratios in dissolved helium (a well known hydrothermal tracer) from 36°N to 40°N along the Mid-Atlantic Ridge (MAR) and over the Azores Plateau. As expected, large δ3He anomalies could be observed over the Rainbow, Lucky Strike and Menez Gwen hydrothermal sites. The main finding of the present study is the discovery of a large hydrothermal 3He plume north of the Acor Fracture Zone (north AFZ site), with a CH4/3He ratio indicative of a basaltic-hosted hydrothermal system. Clear 3He and CH4 anomalies, likely corresponding to unknown venting sites too, were also detected in the Amar Minor segment and south of the Kurchatov Fracture Zone. Evidence for substantial mantle helium degassing was also observed in the deep nodal basins along the Terceira Rift. Based on 3He plumes over the total length of the surveyed segments, the distribution of hydrothermal sites corresponds to a site frequency of 1.3 ± 0.2 site/100 km, in good agreement with the global vent field statistics of Baker and German (2004). For the Rainbow, Lucky Strike and Menez Gwen sites, the application of a plume model based on the conservation of mass, heat and momemtum shows that the heat output computed by the model is only an estimation of the heat released by the focused part of the flow imputable to one single vent. Applied to the north AFZ venting site for which the height of the plume is not known precisely, the model does not allow to discriminate between a Menez Gwen / Rainbow type of venting or a more focused vent complex as the one observed at the TAG site (26°N).

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2007GC001765

Deepwater mantle 3He plumes over the northern Mid‐Atlantic Ridge (36°N–40°N) and the Azores Platform

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Environmental OBT/TFWT Ratios Revisited

Deepwater mantle 3He plumes over the northern Mid‐Atlantic Ridge (36°N–40°N) and the Azores Platform