Interaction of 157Â nm excimer laser on pristine and radiation exposed CR39 polymer

► Surface modification on (CR39) has been investigated using VUV F2 laser. ►We report cones formation and threshold calculation on the pristine surface. ► We observed the changes on surface after exposed to alpha radiation 226Ra. ► We used chemical etching process to reveal micron size tracks and changes after laser treatment. ► Surface morphology's were also observed at different time of exposure.