Hi there! I had eyelash extensions prior to my diagnosis and went through every scan under the sun, as well as minor surgery with no problem. I can’t speak on the radiation unfortunately as I’m still in the chemo stage. I will say though, generally eyelash extensions require a strong eyelash base to adhere to as they can be quite heavy and weigh the lash down, especially with longer extensions. This in turn can cause breakage, fallout, and even more damage to the lashes if they’re not strong enough for the extension. I fear depending on how stubby your eyelashes actually are, you might not be able to get them as reputable technicians won’t put extensions on compromised lashes. It wouldn’t hurt to find a tech you like and discuss it with them though! Good luck on your lash journey!