Equation of state and shock entropy of CaCO

The energy released in a nuclear detonation can vaporize the surrounding medium. If one knows the gaseous equation of state of the medium, it can be used along with estimates of the shock entropy to predict such things as cavity size and seismic effects. We have calculated the equation of state and shock entropy for calcite (CaCO/sub 3/). We formulated the gaseous equation of state for pressures between 1 and 10/sup 6/ bar and temperatures from ambient to 1000 eV using a combination of the TIGER and IEEOS codes. In this report, we also describe the calculational methods and the material parameters used to estimate shock entropy on the loading path. We show how these results can be used to estimate final states following unloading from a given point on the shock Hugoniot. A specific example, dense calcite at 900 kbar, is used to illustrate the method.