When a quartz sandstone target was shocked by a steel ball(6mm in diameter) accelerated to 7km/s by using a two-stage light gas gun

the crystal structure and physical characteristics of the quartz was changed. By measuring the TL of the quartz sandstone before and after shocking it was found that the TL of the quartz sandstone decreased with the increasing shocking pressure and there was a TL gradient from outside to inside around the shocked point. The induced TL test was made for the sample taken from the shocked point at the same time

and an induced TL gradient from outside to inside was also found

though it was less than natural TL gradient. A sample with TL gradient is often valuable for meteror crater determination.