Methods for the immobilisation of dicyclohexano-and Methods for the immobilisation of dicyclohexano-and non-substituted crown ethers are reviewed. Data on the radiation non-substituted crown ethers are reviewed. Data on the radiation chemistry of these compounds and on the influence of irradiation chemistry of these compounds and on the influence of irradiation on the properties of crown-containing extraction systems pub-on the properties of crown-containing extraction systems published over the last decade are discussed systematically. Examples lished over the last decade are discussed systematically. Examples of the use of crown ethers in different fields of radiochemistry are of the use of crown ethers in different fields of radiochemistry are presented. The bibliography includes 199 references presented. The bibliography includes 199 references. .