Scattering Characteristics of a small particles in CST

Hi,
Can anyone help me regarding scattering characteristics of a small particle? I have to build a model for tooth and I have to implement plane wave and find the scattering propagation and backword scattering properties(which scatters back). Initially i have modelled a plane wave scattering from a canonical object such as cone. BUt I dont know how to find scattering properties and field distribution. And also I wanted polyurethane as material object but I could not find it in library. What should I do? Thanks