Organically Bound Deuterium in Rice and Soybean After Exposure to Heavy Water Vapor as a Substitute for Tritiated Water

Uptake of deuterium by dead leaves exposed to deuterated water vapor in a greenhouse at daytime and nighttime

“…Similar constants of C max were obtained for uptake and release for the nighttime exposure. The uptake rate constants of fresh cedar needles were comparable with other plant species (Amano and Atarashi, 1996;Ichimasa et al, 2002).…”

“…The striking difference between the dead and fresh cedar needles is about two times higher D 2 O concentration of the dead cedar needles at the steady state condition, this occurred at daytime and nighttime. The characteristics of the response of the dead cedar needles to atmospheric D 2 O levels of the surrounding air are similar to that of the many fresh plant species (Atarashi et al, 1998;Diabaté and Honig, 1988;Garland, 1980;Garland and Cox, 1982;Ichimasa et al, 2002;Kline and Stewart, 1974;Momoshima et al, 1999b).…”

“…Tritium is one of the most difficult radionuclides to be recovered from liquid and gaseous wastes of the nuclear power stations as well as the nuclear fuel reprocessing plants, which results in environmental contamination around nuclear installations even by controlled routine releases (Bailly du Bois and Guéguéniat, 1999;Momoshima et al, 1987). The contamination of plants with deuterium was examined actively by D 2 O release experiments in Japan in relation to environmental safety researches of the nuclear fusion experimental program and a lot of knowledge was obtained on D 2 O uptake/release by plants and soil (Atarashi-Andoh et al, 2002a,b;Atarashi et al, 1998;Ichimasa et al, 2002;Momoshima et al, 1999a;Yokoyama et al, 2004).…”

A Mini Review of Organically Bound Tritium in the Environment

“…This may be different for nuclear waste repositories and may require stricter regulatory controls. To circumvent the problems of tritum leakages, some researchers used deuterium as substitutes [11] [12] [13]. The basic principle in OBT detection and measurement involves quantification of both eOBT and neOBT.…”