TRU廃棄物の地層処分を想定した放射性炭素の植物による経根吸収 : 酢酸を起源とする放射性炭素の植物への移行

概要

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Hydroponic experiments were conducted to examine root-uptake of ^<14>C in the form of acetic acid by 3 kinds of plants (marigold, tall fescue, and paddy rice) based on buried transuranic (TRU) waste disposal. Also, chamber experiment was conducted to examine loss of ^<14>C as vaporized carbon dioxide (CO_2) from the experimental tessera (spatially heterogeneous environment). The distribution of radioactivity in the plant, mediums, and carbon dioxide (^<14>CO_2) in the chamber were determined, and the distribution of ^<14>C in the plant was visualized by the autoradiography. The plants absorbed and assimilated ^<14>C through the roots. The amount of ^<14>C in marigold and tall fescue were higher than that of paddy rice. However, the amounts of ^<14>C-acetic acid absorbed by all the plants through their roots were considered to be very small. More so, ^<14>CO_2 gas was released from the culture solution to the atmosphere; however, it was not enough for the plant to perform photosynthesis. Assimilation of ^<14>C in the plant shoots would be because of ^<14>C movement of inorganic forms such as CO_2 and HCO_3 via the roots. Thus, the results indicated that the plants absorbed ^<14>C through the roots and assimilated it into the shoots or edible parts not because of uptake of ^<14>C-acetic acid but because of uptake of ^<14>C in inorganic forms.
日本保健物理学会の論文