|Budget Amount *help
¥2,500,000 (Direct Cost : ¥2,500,000)
Fiscal Year 1997 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1996 : ¥1,700,000 (Direct Cost : ¥1,700,000)
It seems that the tritium (T) concentration in the atomosphere increases with increasing the number of nuclear power plants and with advancing the study of nuclear fusion. Gaseous T (i.e., HT) can exchange with H in H_2O vapor, and migrates in the atmosphere. Accordingly, it is important to clarify the behavior of T,and I aim clarifying the effect of T on various functional groups in materials.
From the study for last two years, the followings were carried out : (1) using T-labeled compounds and unlabeled ones, a lot of hydrogen-isotope exchange reactions (T-for-H exchange reactions) were observed as gas-solid (and liquid-solid) reactions, and the reactions were analyzed with both the data obtained and the A"-McKay plot method ; (2) using anion-exchange resins and HTO water, isotope exchange reactions (OT-for-OH exchange reactions) were observed ; (3) the degree of T dispersed from the surface area of T-labeled functional polymers were also observed.
Consequently, the following six were quantitatively found : (1) the T-for-H exchange reaction occurs between HTO vapor and each material having a functional group, and the degree of each reaction varies when the material (or temperature) changes ; (2) the reactivity of a material having two different kinds of functional groups can only be analyzed with the A"-McKay plot method ; (3) the reactivity of strongly basic anion-exchange resin is larger than that of weakly basic one ; (4) the degree of OT-for-OH exchange reaction may be smaller than that of T-for-H exchange one ; (5) the degree of T dispersed from the surface area of functional polymers is not affected by moisture, but is affected by temperature ; (6) the data obtained in this work can be useful to prevent T-contamination.