Abstract
Thiacalix[4]arene impregnated silica adsorbent which is called CAPS-SO 2-adsorbent in this paper shows the excellent separative performance of trivalent actinoids, such as Am from the high-level radioactive liquid waste (HLLW) in weak-acid solution. The chemical stability of the adsorbent was investigated under strong irradiation conditions. The amount of dissolved CAPS-SO 2 was only 1% by gamma-ray irradiation at a total dose of 1 MGy. The value of distribution coefficient of Am (Kd Am) at pH 4 by the adsorbent was constant even the high irradiation dose. Moreover, the separation factor of Am to lanthanoids is kept a high value. It was also found that the value of Kd Am by the irradiated CAPS-SO 2-adsorbent increases at pH 2.
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