Abstract: SORPTION BEHAVIOUR OF RADIOACTIVE TECHNETIUM IN SOILSXia Deying(China Institute of Atomic Energy,P.O.Box 275(93),Beijing 102413)Shinichi Takebe;Muneaki Senoo(Department of Environmental Safety Research,Tokai Research Establishment,Japan Atomic Energy Research Institute)Abstract:The sorption behaviour of technetium in different soils has been studied by batch experiments under aerobic conditions.The soil samples have been taken to study the characteristics and to derive the pH-Eh values,In addition,the activated carbon and reduced iron powder have been selected as additives to the JAERl sand according to our former research work,so that the technetium sorption behaviour in the artifical soils can be studied under similar conditions.The experimental results show that all these soil samples except for the gley soil have a very small distribution coefficient for Tc,while the artifical soils have a very large distribution coefficient for Tc.Besides,for artificial soils,the distribution coefficient(Rd)values will become larger and larger when more additive is added and more contact time is allowed.The physico-chemical fixation processes and possible sorption modes have been discussed as well.Keywords:Soils Sorption behaviour Batch experiment Distribution coefficient