Durability of CMPO Impregnated Silica Adsorbent under Irradiation Conditions

概要

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Separation of Cs and Sr from simulated high-level radioactive liquid waste (HLLW) was performed using an octylphenyl-N,N-diisobutylcarbomoyl phosphine oxide impregnated silica adsorbent (CMPO-adsorbent). As part of HLLW treatment, the adsorbent is subjected to strong irradiation. Therefore, the durability of CMPO-adsorbent under gamma-ray irradiation conditions was studied. CMPO decomposed to phosphoric acid after a transition to octylphenyl phosphinic acid (OPP). The adsorbed amount of actinoids and lanthanoids were found to decrease linearly with increasing irradiation dose. However, at a dose of 2 MGy, the CMPO-adsorbent was able to maintain adsorption at a rate of 80% of its initial capacity. Based on this finding, it is estimated that the adsorbent can be used in the treatment of HLLW for 400–500 cycles. Radiolytic degradation products increase with increasing irradiation dose caused by HLLW. If OPP accumulates in a CMPO-adsorbent, actinoids and lanthanoids are not recovered. OPP dissolves easily by washing with an eluent, suggesting that OPP would not accumulate in the adsorbent. After washing, separation performance was maintained with a dose of 2 MGy.
社団法人日本原子力学会の論文
2006-05-25