Korea Atomic Energy Research Institute

Korea Electric Power Corporation

Wang Kyu Choi

Sang Yoon Park

Bum Kyoung Seo

Hyun Soo Park

Man Soo Choi

Kune Woo Lee

Jei Kwon Moon

Jong Seung Kim

Hui Jun Won

Hee Chul Eun

Byung Seon Choi

Na On Chang

Chong Hun Jung

Seon Byeong Kim

Sang Hun Lee

Song Bok Lee

Won Zin Oh

Moon Hwan Cho

Jong Kook Kim

The present disclosure provides a solidifying method of a radionuclide. The solidifying method of the radionuclide includes operations of: providing a low melting point glass including BiO, BO, ZnO and SiO; providing a glass mixture mixing a mixture to be treated containing a hydroxide of radionuclide and BaSOand the low melting point glass; and heating the glass mixture.

Solidifying method of hydroxides of radionuclides

Novel calix[4]arene dibenzo crown ethers useful to selectively extract cesium are represented by the formula: wherein R is a C.sub.1 -C.sub.10 normal alkyl, a phenyl or a methoxyphenyl, R' is hydrogen, p-tert-butyl or a C.sub.1 -C.sub.10 normal alkyl, R' is a C.sub.1 -C.sub.10 normal alkyl, and n is an integer of 0-2. The novel compound is prepared at high yields by introduction of benzene rings into the crown ether ring of calix[4]arene crown-6-ether. The calix[4]arene dibenzo crown ethers are superior in selective absorptivity for cesium ions by virtue of their 1,3-alternate conformational structure and thus, can be used as selective extractants able to separate cesium ions at a high efficiency.

Calix[4 ]arene dibenzo crown ethers, their preparation process and their

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Taejon-si, South Korea

Wang Kyu Choi