Investigation of isentropic compression and equations of state of fissionable materials

In 1957, to enable the experimental study of fissionable materials at pressures of tens and hundreds of atmospheres, a new approach, which came to be known as the ''Nonexplosive Chain Reaction'' method, was suggested at VNIIEF. Based on compressibility data obtained with the NCR and shock wave methods, the equations of states of plutonium and uranium at record high pressures and densities were constructed.