Some aspects of shock-induced radiation from transparent media

Radiation from shock-compressed water at pressures of 10.0–39.5 GPa loaded through targets made of various metals (Al, Mg, and Cu) is studied. It is shown that the radiation intensity depends on both shock pressure and the nature of the metal. At pressures below 25 GPa in the region of water transparency, the radiation intensity considerably exceeds the presumed level of thermal radiation. This effect can partly be explained by the interaction of the target material with water and by nonthermal radiation from shock-compressed water. For comparison, some experimental data on shock-induced radiation from a number of transparent materials (Kron-8 optical glass, glycerin, AND sodium salt) are given.