Since the end of the last century, dicyclohexano-substituted crown ethers have been considered promising extractants. In particular, they are very attractive for strontium removal from acidic radioactive waste generated at different stages of spent nuclear fuel reprocessing. Besides other properties, purity, isomeric composition and radiation resistance of dicyclohexano-substituted crown ethers are responsible for the efficiency of strontium removal from acidic waste. This book discusses principles of dicyclohexanocrown ethers "physical" immobilization and prospective trends in the development of crown-containing extraction systems for acidic radioactive waste reprocessing.