Fate of HTO following its acute soil deposition at different growth stages of Chinese cabbage

Root uptake of radionuclides following their acute soil depositions during the growth of selected food crops

“…Rice, Chinese cabbage, radish, potato and cucumber plants were grown in lysimeters filled with soil collected from an abandoned field (Choi et al, 1995(Choi et al, , 1998(Choi et al, , 2000(Choi et al, , 2007aLee et al, 1997). The lysimeters were 0.6 m wide, 0.6 m long and 1.0 m high and placed in a greenhouse.…”

“…The results of the greenhouse experiments for an acid sandy soil are given in Tables 4-6 (Choi et al, 1995(Choi et al, , 1998(Choi et al, , 2000(Choi et al, , 2007aLee et al, 1997). The T a ag values varied considerably with the radionuclides, plant species, and times of deposition.…”

“…For a chronic HTO release, a specific activity model, which is based on the assumption that plant tritium will be in equilibrium with atmospheric tritium, is widely used (Diabaté and Strack, 1990;Peterson and Davis, 2000). This kind of model cannot be applied to an acute release of HTO (Choi et al, 2007a;Higgins, 1997). Deposition time-dependent T a ag values as presented in Tables 5 and 6 may be useful for evaluating the root uptake of HTO deposited onto soil after its acute release during the growth of crop plants.…”

Tritium concentration in soybean plants exposed to atmospheric HTO during nighttime and daytime

“…The existing studies mainly focus on the routine release and short atmospheric HTO exposure at daytime [4,[11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Little information is currently available regarding the tritium uptake and subsequent formation of organically bound tritium (OBT) in plants exposed to elevated levels of atmospheric tritium during the nighttime [24].…”

Development and validation of a dynamical atmosphere–vegetation–soil HTO transport and OBT formation model

“…On the other hand, newly formed leaves spend synthesized carbohydrates for their own growths, and also import carbohydrates from the source leaves. Demands for photosynthates from sink parts, such as roots, ears, as well as young leaves, are high when they are actively growing (Choi et al, 2002(Choi et al, , 2005(Choi et al, , 2007Taiz and Zeiger, 2002).…”