Acquiring the 137Cs reference inventory values is the first step for using 137Cs technique to estimate rates of soil erosion and sediment deposition.

Therefore the value of 137 Cs reference inventory of the Gonghe Basin is calculated to be ( 2 691.

Investigation of background value of some indexes in flour;

The background value of concentration of the petroleum hydrocarbons in mollusc along the coast has been calculated.

The basis of the ~(137)Cs technique and the uses of this technique to investigate the sedimentation rates of suspended sediments deposited on river floodplains are reviewed to identify the sources of sediments and to research the sediment-associated contaminates on river floodplains.

Based on the methodology of study on water, soil environmental capacity and mass conservation theory in a system, the concept and model on sediment environmental capacity for ~(137)Cs in Daya Bay are developed.

This paper represents the study of migration of~(90)Sr and~(137)Cs in a kind of aerated zone soil.

The results show that: (1) the wall of the waste disposition pit has a good capacity to stop leaking of the radioactive liquid; (2) 226 Ra and 232 Th have almost the same characteristic when they migrate with water through soil; (3) the migration velocity of 137 Cs in soil is about 1.

This review describes research progress of several methods of 137 Cs removal from acidic high level liquid waste such as precipitation, volatilization, solvent extraction, inorganic ion exchange.

In this paper, the results of the 90 Sr and 137 Cs contents in biologic samples and the natural U in soil samples obtained in a joint effort by fourteen environmental radiation laboratories in the Chinese environmental protection system were analyzed and compared.