سعة امتساك بعض الترب العراقية لنويدات السيزيوم-137 (137Cs)‎

Abstract EN

Cesium-137 has been worldwide used for estimation soil erosion.

Its movement and transport in the environmental media depend on its retention by soil.

Retention capacity of soil for radionuclides and pollutants as expressed by the distribution coefficient Kd (ratio of radionuclides retained by soil to those remained in liquid) that was estimated for 137Cs in some soils of Iraq.

The soils were varied in clay 24.0-50.5% , organic mater 0.5-1.5% , and lime content 28.1-35.0% .

Results showed that all the factors investigated were found to alter the values of Kd.

The mean of Kd was 774 L kg-1 in the loam soil increased to 4375 L kg-1 in the clay soil when equilibrated with deionized water.

These values were reduced to 402 and 1088 L kg-1 in chloride solution and 146 and 297 L kg-1 in groundwater for the loam and clay soils, respectively.

The increased liquid to solid ratio showed a tendency to increase the distribution coefficient under the trace concentration of cesium.

It was observed that an increase in the distribution coefficient of cesium from 1079 to 3312 L kg-1 when the liquid to solid ratio increased from 1: 1 to 10: 1.

Differences in Kd were explained on the basis of ion exchange mechanism and indicate that certain test conditions.

could be adopted by researchers for a precise estimate of the Kd.

Such conditions should be corresponded as closely as possible to the natural field conditions.