Fissure static

Figure 2. Apparatus used in static fissure adsorption experiments...

Table I. Am Adsorption by Gray Hornblende Schist Fissure Experiments (static)...

Model Predictions. The rate for desorption of americium from the fissure surfaces into solution was assumed to equal the rate for the adsorption of americium from solution by the fissure surfaces. The sorption rate and the equilibrium fractionation of americium that were determined in the static experiments were used to determine input parameters to the ARDISC model. The ARDISC model predictions for the distributions of americium on the fissure surfaces in both sets of experiments are presented in Figures 5 through 10 along with the autoradiographs and the experimental histograms representing the various distributions of americium on the fissure surfaces. 

Figure 13. Plot of In fraction of americium in solution vs. time for the data obtained in the static fissure absorption experiments...

Laboratory experiments with model systems under static conditions have been aimed at the determination of the retention mechanisms of colloids and pseudocolloids (association of a heavy element with a colloid) onto mineral surfaces. This will give a better understanding of the fate of radioelements associated with colloids upon interaction with mineral surfaces as it will occur in the water fiow across fissures and fractures around a radwaste repository. In these studies, polished cm-sized monoliths are used to simulate macroscopic surfaces of fine particles or as mineral surfaces. Rutherford Backscattering Spectrometry BS) is the technique chosen to determine accurately the amount of elements fixed on the monolith. 

UDEC is used to simulate the discontinuous medium (such as joints and fissures in rock mass, etc.) under static load and dynamic load under the action of the response. Discontinuous medium is represented via discrete block assembly. Discontinuity handling for the block between the boundary surfaces, allow the block along the discontinuity occurs larger displacement and rotation which include fully out, and in the process of computing, automatic identification the new interface(Hao Zhiyong et al. 2007. Song Genxiang, et al. 2009). 

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