Abstract: STUDIES ON THE SORPTION OF TECHNETIUM ON GLEY SOILXia Deying(China Institute of Atomic Energy, P. O. Box 275(93),Beijing 102413)Shinichi Takebe(Department of Environmental Safety Research, Tokai Research Establishment, Japan Atomic Energy Research Institute)Abstract:The sorption behaviour of technetium on gley soil is studied by batch experiment.The effects of additions of dextose (in order to activate the microbial activity),NaOH and humic acid on the sorption of Tc by gley soil have also been investigated.The results show that the sorption ratio of Tc on gley soil is higher than that on ordinary surface soils(for example:sand and tuff),the mi crobial acivity and the addition of NaOH have great influence on sorption of Tc on gley soil,whereas the addition of humic acid has little effect on sorption behaviour.Keywords: Technetium Sorption Microbial activity Gley soil