Is it ionizing, nonionizing or gamma radiation??

Answer 1

Yes, ionizing or gamma. Gamma is a very high energy type of ionizing radiation. XRays are also effective.

http://www.newscientist.com/article/mg13318091.100-radiation-linked-to-longterm-gene-damage-.html

Answer 2

If you have to pick one answer, gamma radiation is the best choice. There are some ionizing radiation types that do not cause gene damage, mainly becasue they do not normally reach the sexual organs.